SENSORS & SYSTEMS
Authority in Displacement Measurement
CO
Non-Contact
Displacement and
Thickness Measuring
Instruction Manual
optoNCDT 2401/2402
MICRO-EPSILON
MESSTECHNIK
GmbH & Co. KG
Königbacher Strasse 15
D-94496 Ortenburg
Tel. 0 85 42/1 68-0
Fax 0 85 42/1 68-90
e-mail [email protected]
www.micro-epsilon.com
Certificated acc. to DIN EN ISO 9001: 2008
V1.2
Contents
1.
Safety ...................................................................................... 5
1.1
1.2
1.3
1.4
1.5
Symbols Used ........................................................................................ 5
Warnings ................................................................................................ 5
Notes on CE Identification ..................................................................... 5
Proper Use ............................................................................................. 6
Proper Environment ............................................................................... 6
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Short Description ................................................................................... 7
Measurement Principle ........................................................................... 8
Glossary ................................................................................................. 8
Typical Applications ............................................................................... 8
Sensor .................................................................................................... 9
Control Elements Controller ................................................................... 9
Light Source ......................................................................................... 10
Technical Data IFS2401 ........................................................................ 10
Technical Data IFS2402 ........................................................................ 11
3.1
3.2
Supplied Items ..................................................................................... 12
Storage ................................................................................................ 12
4.1
4.1.1
4.1.2
4.2
4.3
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
Mounting and Dimensions of Sensors .................................................. 13
Start of Measuring Range .................................................................... 15
Circumferential Clamping ..................................................................... 15
Sensor Cable ....................................................................................... 16
Controller Dimensions .......................................................................... 17
Electrical Connections ......................................................................... 17
Power supply ....................................................................................... 17
RS232/RS422 Interface ........................................................................ 17
USB Interface ....................................................................................... 18
Analog Output ...................................................................................... 18
Synchronization ................................................................................... 18
Digital I/O, Encoder ............................................................................. 19
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.10.1
5.10.2
5.10.3
5.10.4
5.10.5
5.10.6
5.10.7
5.10.8
5.11
5.12
Commissioning .................................................................................... 21
Displacement Measuring ...................................................................... 21
Thickness Measurement ....................................................................... 21
Acquiring the Dark Signal .................................................................... 22
Analog Output ...................................................................................... 22
Adjustment of the LED Brightness ........................................................ 23
Adjustment of the Measuring Rate ....................................................... 23
Light Intensity ....................................................................................... 23
Synchronized Controller and Encoder Data ......................................... 24
Triggering ............................................................................................. 24
Trigger Modes ...................................................................................... 24
Trigger Input ......................................................................................... 24
Start Trigger ......................................................................................... 25
Level Trigger ......................................................................................... 25
Edge Trigger ........................................................................................ 25
Latch Trigger ........................................................................................ 26
Software Trigger ................................................................................... 26
Maximum Trigger Frequency ............................................................... 26
Response Time .................................................................................... 27
Double Frequency ............................................................................... 28
6.1
6.2
Data Format ......................................................................................... 31
Command Syntax ................................................................................ 32
2.
3.
4.
5.
6.
Functional Principle, Technical Data ..................................... 7
Delivery ............................................................................... 12
Installation and Assembly .................................................. 12
Operation ............................................................................. 21
Serial Interface.................................................................... 30
optoNCDT2401
6.3
6.3.1
6.3.2
6.4
6.4.1
6.4.2
6.4.3
6.5
6.5.1
6.5.2
6.5.3
6.5.4
6.6
6.6.1
6.6.2
6.6.3
6.6.4
6.6.5
6.6.6
6.6.7
6.6.8
6.6.9
6.6.10
6.6.11
6.6.12
6.6.13
6.6.14
6.6.15
6.6.16
6.6.17
6.6.18
6.6.19
6.6.20
6.6.21
6.6.22
6.6.23
6.6.24
6.6.25
6.6.26
6.6.27
6.6.28
6.7
6.8
Data Transmission Formats .................................................................. 32
ASCII .................................................................................................... 32
Binary ................................................................................................... 33
Transmitted Data .................................................................................. 34
Available Data ...................................................................................... 34
Meaning of the Data ............................................................................. 34
Data Selection ...................................................................................... 35
Data Decoding ..................................................................................... 36
Displacement Measuring Mode ........................................................... 36
Thickness Measuring Mode ................................................................. 36
Decoding the Barycenter Values .......................................................... 37
Decoding the State Data ..................................................................... 37
Commands .......................................................................................... 38
Sensor Selection .................................................................................. 38
Measuring Rate .................................................................................... 38
Displacement and Thickness Measurement ......................................... 40
Analog Output ...................................................................................... 40
Dark Signal .......................................................................................... 41
Fast Dark Signal ................................................................................... 41
Refractive Index .................................................................................... 42
Light Source Brightness ....................................................................... 42
Averaging ............................................................................................. 42
Spectral Averaging ............................................................................... 43
Hold Last Valid Value ........................................................................... 43
Trigger Functions ................................................................................. 43
Get Controller Configuration ................................................................ 45
Detection Threshold ............................................................................. 46
Light Source Test ................................................................................. 47
Auto-adaptive Dark Signal ................................................................... 47
Auto-adaptive Light Source Brightness ................................................ 47
First Signal Maximum ........................................................................... 48
Watchdog ............................................................................................ 50
Save the Controller Configuration ........................................................ 50
Serial Number, Software Version .......................................................... 50
Reset Encoder Counter ........................................................................ 50
Setting the Zero Values ........................................................................ 51
Missing Signal in Thickness Measurement Mode ................................. 51
Selection Light Source ......................................................................... 52
Switch on Double Frequency ............................................................... 52
Select Frequencies for Double Frequency ........................................... 52
Transmitted Intensity in Double Frequency Mode ................................ 52
Command List ...................................................................................... 53
HyperTerminal ...................................................................................... 55
7.1
7.2
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
Preparation for Measurements ............................................................. 56
Installation ............................................................................................ 56
Working with the IFD2401 Tool ............................................................ 58
Elements in the Main Window .............................................................. 58
Interface ............................................................................................... 58
CCD ..................................................................................................... 59
Displacement Measuring ...................................................................... 59
Thickness Measuring ............................................................................ 59
7.
8.
9.
10.
11.
12.
IFD2401 Tool ....................................................................... 56
Warranty ..............................................................................
Decommissioning, Disposal ...............................................
Troubleshooting ..................................................................
Reset to Factory Setting.....................................................
Maintenance ........................................................................
optoNCDT2401
60
60
61
62
62
Safety
1.
Safety
The handling of the system assumes knowledge of the instruction manual.
1.1
Symbols Used
The following symbols are used in this instruction manual:
1.2
DANGER!
- imminent danger
WARNING!
- possible dangerous situation
IMPORTANT!
- application tips and information
Warnings
• Avoid banging and knocking the sensor and the controller
> Damage or destruction of the sensor and/or the controller
• Power supply must be connected in accordance with the safety regulations for
electrical equipment
> Damage or destruction of the controller
• Protect the cables against damage
> Failure of the measuring device
• Protect the ends of the sensor cable (fibre optics) against pollution
> Failure of the measuring device
• Sensor and controller are matched together. Do not interchange
> Loss of specified technical data
1.3
Notes on CE Identification
The following applies to the Series 2401/2402 optoNCDT measurement system:
EMC regulation 2004/108/EC
Products which carry the CE mark satisfy the requirements of the EMC regulation
2004/108/EC "Electromagnetic Compatibility" and the European standards (EN) listed
therein.
The EC declaration of conformity is kept available according to EC regulation, article
10 by the authorities responsible at
MICRO-EPSILON MESSTECHNIK
GmbH & Co KG
Königbacher Straße 15
D-94496 Ortenburg
The system is designed for use in industry and to satisfy the requirements of
the standards
• EN 61000-6-3: 2007
• EN 61000-6-2: 2005
The systems satisfy the requirements if they comply with the regulations described in
the operating manual for installation and operation.
optoNCDT2401
5
Safety
1.4
Proper Use
• The series 2401/2402 measuring system is designed for use in industrial areas.
• It is used
- for measuring displacement, distance and thickness
- for in-process quality control and dimensional testing
• The measuring system may only be operated within the limits specified in
the technical data (chap. 2.8 and 2.9).
• The system should only be used in such a way that in case of malfunctions or
failure personnel or machinery are not endangered.
• Additional precautions for safety and damage prevention must be taken for
safety-related applications.
1.5
Proper Environment
• Protection class sensor:
IP40 (Only with sensor cable connected)
• Protection class controller: IP40
• Lenses are excluded from protection class. Contamination of the lenses leads
to impairment or failure of the function.
• Operating temperature:
10 ... 50 °C
• Storage temperature:
-30 ... 70 °C
• Humidity:
5 - 95 % (not condensing)
• Pressure:
atmospheric pressure
• EMC:
acc. EN 61 000-6-3: 2007
EN 61 000-6-2: 2005
optoNCDT2401
WICHTIG!
The protection class is
limited to water (no
penetrating liquids or
similar).
6
Functional Principle, Technical Data
2.
Functional Principle, Technical Data
2.1
Short Description
The optoNCDT2401/2402 consists of a sensor and controller which are connected with
a fibre-optic sensor cable.
The sensor is totally passive, since it incorporates no heat sources or moving parts,
thus avoiding any thermal expansion which could affect the accuracy of the sensor
measuring process.
Certain precautions are necessary when handling the fibre-optic sensor cable which
connects the sensor to the controller, such as avoiding bending the fibre to a radius of
curvature of less than 30 mm. Moreover, the operator must ensure that the ends of the
fibre are at all times either connected to the sensor and the controller, or are fitted with
their protective caps, in order to avoid any possibility of contaminating the tips of the
fibre.
The controller incorporates a LED light source and converts the light signals received
from sensor, calculates distances via its on-board DSP processor, as well as providing
display and data transmission functions via the RS232 or USB link or via the 0 – 10 V
analog output.
Controller
Polychromatic
Light Source
RS232/422 and
DSP
Spectrometer
USB
DAConverter
Analog
output
Fibre-optic Connector
Sensor
Fig. 2.1: Block diagram optoNCDT 2401/2402
optoNCDT2401
7
Functional Principle, Technical Data
2.2
Measurement Principle
Polychromatic white light is focused onto the target surface by a multi-lens optical
system.The lenses are arranged such that the white light is dispersed into a
monochromatic light by controlled chromatic deviation. A certain distance is assigned
to each wavelength by a factory calibration. Only the wavelength which is exactly
focussed on the target is used for the measurement. This light reflected from the target
surface is passed via a confocal aperture to the receiver which detects and processes
the spectral changes.
This unique measuring principle enables displacements and distances to be measured
with high precision. Both diffuse and specular surfaces can be measured. With transparent materials a one sided thickness measurement can be accomplished along with the
distance measurement. Since the emitter and receiver are arranged in one axis,
shadowing is avoided.
IMPORTANT!
Sensor and controller are
matched together.
Due to excellent resolution and small spot diameters surface structures can be
measured. Note that measurement incertainly may occur, if the structure dimensions
are similar to the spot diameter, or if the acceptable tilt on a structure, e.g. turning rill,
is exceeded.
2.3
Glossary
SMR
Start of measuring range. Minimum distance between sensor front and
measuring object
Midrange
End of measuring range (Start of measuring range + measuring range).
Maximum distance between sensor front and measuring object.
Measuring range
MMR
EMR
MR
Signal
10
5
0
SMR
MMR
Measuring
Sensor
SMR
EMR Displacement
Range (MR)
Measuring
object
Fig. 2.2: Measuring range and controller output signal
2.4
Typical Applications
• Measure profiles or surface topographies, when the sensor is combined with
a 3D measurement station,
• Measure surface reflectivities – in which case the sensor behaves like a
microscope, but provides the advantage of greater depth of field,
• Measure thickness (from a few tens of microns to several millimetres) of
transparent materials.
optoNCDT2401
8
Functional Principle, Technical Data
2.5
Sensor
The sensors are interchangeable: the same controller can store up to 20 different
calibration tables corresponding to different sensors. The sensor is totally passive,
since it incorporates no heat sources or moving parts, thus avoiding any thermal
expansion which could affect the accuracy of the measuring process.
2.6
IMPORTANT!
Protect the ends of the
sensor cable (fibre optics)
and the sensor lens
against pollution.
Control Elements Controller
On / Off
Switch
RS232/422
interface
USB interface
LEDs
Digital I/O (encoder)
Power supply
Sensor
input
External
light source
Analog output,
Synchronization
Reset
Analog output
Dark signal
acquisition
Fig. 2.3: Front view controller
LEDs on the controller
Error
Intensity
Measure
Red
Light source test fails
Orange
Data overflow error, data non-evaluable
Off
No error
Off
Single frequency mode
No signal
Double frequency mode
No signal
Red
Signal saturated
Signal saturated for both frequencies
Green
Signal intensity is comfortable
Signal intensity is comfortable
Orange
Signal intensity is low
No relevance
Off
No measuring object or outside the measuring range
Green
Measuring object in midrange
(between 15 and 85 % FSO)
Orange
Measuring object at the intermediate zone of the measuring
range (between 0 and 15 % FSO or 85 and 100 % FSO)
optoNCDT2401
9
Functional Principle, Technical Data
2.7
Light Source
The controller is equipped with an LED as internal light source. An external light source
can optionally be connected through the “Ext. light source” input, see Fig. 2.3.
LED
Type
Internal
Normal
Measuring range
Light level adjustment Command
Halogen
External
Extended
No
Xenon
External
Normal
Hardware
The controller features an automatic test of the light source. The “Error” LED turns RED
when the LED or the lamp should be replaced. The light source test may be enabled or
disabled by command (see Chap. 6.6.17).
2.8
Technical Data IFS2401
IFS
IFS
IFS
IFS
IFS
IFS
IFS
IFS
IFS
2401-0.12 2401-0.4 2401-1 2401-3 2401-10 2400-10 2400-20(01) 2400-24 2401-25
Modell (standard)
Measuring range
Start of measuring range
mm
0.12
0.3
1
3
10
8.5
20
24
22
mm (ca.)
3.4
10.5
10.0
16.3
27.0
67.0
63
213
20.2
Spot diameter
Linearity
μm
7
10
10
25
50
50
100
100
100
μm
0.12
0.3
0.5
1.5
5
5
2.8
12
11
% FSO
μm
Resolution
≤ ± 0.1
~0.005
≤ ± 0.05
0.012
0.04
% FSO
Weight
0.12
0.4
0.004
0.4
0.7
0.005
0.003
≤ ± 0.05
~1
~0.9
0.004
Sensor
0.20 kg
0.22 kg
0.22 kg 0.16 kg
0.19 kg
0.68 kg
3.0 kg
0.52 kg
0.19 kg
Sensor +
MA 2400
0.38 kg
0.40 kg
0.40 kg 0.34 kg
0.37 kg
0.90 kg
***
0.76 kg
0.37 kg
± 43 °
± 28 °
± 27 °
± 14 °
± 14 °
± 20 °
± 5°
± 8.5 °
Max. allowed angle of reflection
in direct reflection
Measuring rate
± 22 °
selectable from 100 Hz up to 2000 Hz
Ambient light
30,000 lx
Light source
LED
Protection class (sensor/controller)
IP 40
Temperature stability (sensor)
0.01 % FSO / °C
Operation temperature
+10 up to +50 °C
Storage temperature
-30 °C up to 70 °C
2x 0 - 10 V (15 Bit) / RS 232 / RS 422 / USB 2.0
Output
Versorgung
24 VDC
standard 3 m option up to 50 m
bending radius: 30 mm (static), 40 mm (dynamic)
Sensor cable (fiber optic cable)
Dimensions
Controller
≤ ± 0.014
Functions
Electromagnetic compatibility (EMC)
(W x H x D): 168 x 138 x 111.5 mm (6.61 x 5.43 x 4.39 inches)
functions: touch keys, trigger, synchronization,
storage of up to 20 configurations (for sensors with different ranges)
according to EN 61000-6-3: 2007 and EN 61000-6-2: 2005
FSO = Full Scale Output
All data based on constant ambient temperature during measurement against an
'optical flat' glas target in direct reflection.
optoNCDT2401
10
Functional Principle, Technical Data
2.9
Technical Data IFS2402
Model (standard)
Measuring range
Start of measuring
range
approx.
Spot diameter
Linearity
Resolution
IFS
2402-0.4
IFS
2402-1.5
IFS
2402/90-1.5
IFS
2402-4
IFS
2402/90-4
IFS
2402-10
IFS
2402/90-10
400 μm
1.5 mm
1.5 mm
3.5 mm
2.5 mm
6.5 mm
6.5 mm
1.5 mm
0.9 mm
2.5 mm
10 μm
20 μm
20 μm
20 μm
20 μm
100 μm
100 μm
~0.3 μm
1.2 μm
1.2 μm
~3.0 μm
2.0 μm
13 μm
13 μm
Measuring rate
1.9 mm
2.5 mm
1)
2.5 mm
≤± 0.08 % FSO
0.016 μm
0.06 μm
0.06 μm
0.14 μm
1)
0.10 μm
≤0.7 μm
≤0.7 μm
0.01 % FSO
50 g
± 8°
± 5°
± 5°
± 3°
± 3°
± 1.5°
± 1.5°
selectable from 100 Hz up to 2000 Hz, optional 30 kHz
Ambient light
30.000 lx
Light source
LED
Protection class (sensor/controller)
IP 40
Operation temperature
+10 up to +50 °C
Storage temperature
-30 °C up to 70 °C
Output
2x 0 - 10 V (15 bit) / RS 232 / RS 422 / USB 2.0
Supply
24 VDC
Sensor cable (fiber optic cable)
3.5 mm
≤± 0.2 % FSO
0.004 % FSO
Weight
Max. allowed angle of reflection in
direct reflection
1)
integral cable: standard 2 m option up to 50 m
bending radius: 30 mm (static), 40 mm (dynamic)
dimensions (W x H x D):168 x 138 x 111.5 mm (6.61 x 5.43 x 4.39 inches)
Controller
Electromagnetic compatibility (EMC)
functions: touch keys, trigger, synchronization, storage of up to 20 configurations (for sensors
with different ranges)
according to EN 61000-6-3: 2007 and EN 61000-6-2: 2005
FSO = Full Scale Output
1) Start of measuring range (SMR) measured from sensor axis
All data based on constant ambient temperature during measurement against an
'optical flat' glass target in direct reflection.
optoNCDT2401
11
Delivery
3.
Delivery
3.1
1
1
1
1
1
Supplied Items
Sensor
Sensor cable
Controller
Test log
Instruction manual
Once unpacked, check immediately for completeness and transit damage. If damage
is found or the shipment is incomplete, please contact the manufacturer or supplier
immediately.
3.2
Storage
Storage temperature:
Relative humidit:
4.
-30 to +70 °C (-22 °F to +158 °F)
5 to 95 % (non-condensing)
Installation and Assembly
The sensors of the series IFS240x are optical sensors, which are used to measure in
μm-range. Be careful in mounting and installation!
Connect the controller to a power supply (+24 VDC)
External light source:
If your sensor is equipped with an external light source, connect the light box to the
“Ext. light source“ socket located on the controller front panel using the illuminator
optical fiber.
IMPORTANT!
Handle optical sensors with
care.
The light beam must be
directed perpendicular onto
the surface of the target to
avoid measuring errors.
Sensor
Sensor cable
Controller
Analog
evaluation device
optoNCDT2401
Wiring
Power supply
Industrial PC
USB/RS232/RS422
12
Installation and Assembly
Mounting and Dimensions of Sensors
ø27 1 (1.06)
ø20 (.79)
28 (1.10)
37.6 (1.48)
28 (1.10)
37.6 (1.48)
IFS2401-0,4
145.5 (5.73)
3 (.12)
SMR 16.3 (.64)
Mounting area
8.3 (.33)
Mounting area
ø11 (.43)
ø23.6 (.80)
ø11 (.43)
ø23.6 (.80)
IFS2401-0,12
ø27 1 (1.06)
ø20 (.79)
8.3 (.33)
1 (.04)
SMR10.0 (.39)
8.3 (.33)
0.3 (.01)
SMR 9.9 (.39)
218.7 (8.61)
Mounting area
178.2 (7.02)
28 (1.10)
37.6 (1.48)
28 (1.10)
37.6 (1.48)
Mounting area
SMR 3.4 (.13)
0.12 (.005)
ø27 1 (1.06)
ø20 (.79)
ø27 1 (1.06)
ø20 (.79)
ø6 (.24)
ø20.3 (.80)
Legend:
mm
(inches)
176.1 (6.93)
4.1
ø11 (.43)
ø23.6 (.80)
IFS2401-1
IFS2401-3
ø27 (1.06)
ø32
ø27 1 (1.06)
ø20 (.79)
optoNCDT2401
IFS2400-10
(2.32)
ø45 (1.77)
SMR 213 (8.39)
ø28.3 (1.11)
57.5 (2.26)
Mounting area
172.5 (6.79)
59.7 (2.35)
149.2 (5.87)
105.7 (4.16)
Mounting area
(1.97)
ø59 +0.2
-0.1
24
(.94)
Not to scale
SMR = Start of measuring range
1) Tolerances of the mounting diameter: +0.2 / -0.1 mm
SMR 67.0 (2.64)
IFS2401-25
191.5 (7.54)
151.8 (5.98)
Mounting area
ø8 (.31)
+0.2
ø50.0 -0.1
8.5
(.33)
ø11 (.43)
ø23.6 (.80)
22 (.87)
SMR 20.2 (.80)
8.3 (.33)
10 (.39)
SMR 27.0 (1.06)
145.5 (5.73)
Mounting area
28 (1.10)
37.6 (1.48)
28 (1.10)
37.6 (1.48)
ø27 1 (1.06)
ø20 (.79)
IFS2401-10
(1.26)
IFS2400-24
13
Installation and Assembly
Continuation dimensional
drawings of the sensors
-0,15
(.78)
132.6 (5.22)
(.59)
20 -0,10
30
15
(1.57)
+0,15
40 +0,05
(1.18)
(.82)
¯21
34.4
(1.35)
4x M4x10
167 (6.57)
¯45 (1.77)
197 (7.75)
¯95 (3.74)
20
(.78)
SMR63 (2.48)
¯62 (2.44)
IFS2400-20(01)
MR
IFS2402-0,4/1,5/4/10
optoNCDT2401
(.08)
73.25 (2.88)
6.25
1.94
15
(.59)
Mounting area
(0.1)
SMR
Titanium
housing
6.25 (.25)
3 (.12)
(.16)
+0
¯4 -0.2
(.16)
2.5
+0
ø4 -0.2
69±0.1 (2.72±.004)
Bend protection
and cord grip
Titanium housing
68 (2.68)
Lens ø1.8
(.07)
Fiber-optic ¯2.1
(.08)
15
(.59)
Fiber-optic ø2.1
(.08)
Bend protection
and cord grip
2 (.08)
SMR
MR
IFS2402/90-1,5/4/10
14
Installation and Assembly
4.1.1
Start of Measuring Range
For each sensor a minimum distance to the measurement object must be maintained.
Sensor
SMR
Measuring object
Fig. 4.3: Start of measuring range (SMR), the smallest distance between sensor face
and measuring object.
Se nsor
Se nsor
Sta rt of m e a suri ng ra ng e
IFS 2 4 0 1 -0 ,1 2
Sta rt of m e a suri ng ra ng e
IFS 2 4 0 2 -0 ,4
3 .4 (.1 3 )
Legend:
1 .5 (.0 6 )
IFS 2 4 0 1 -0 ,4
9 .9 (.3 9 )
IFS 2 4 0 2 -1 ,5
0 .9 (.0 4 )
IFS 2 4 0 1 -1
1 0 .0 (.3 9 )
IFS 2 4 0 2 / 9 0 -1 ,5
0 .5 (.0 2 )
IFS 2 4 0 1 -3
1 6 .3 (.6 4 )
IFS 2 4 0 2 -4
1 .9 (.0 7 )
IFS 2 4 0 1 -1 0
2 7 .0 (1 .0 6 )
IFS 2 4 0 2 / 9 0 -4
0 .5 (.0 2 )
IFS 2 4 0 0 -1 0
6 7 .0 (2 .6 4 )
IFS 2 4 0 2 -1 0
2 .5 (.1 0 )
IFS 2 4 0 1 -2 5
2 0 .2 (.8 0 )
IFS 2 4 0 2 / 9 0 -1 0
1 .5 (.0 6 )
IFS 2 4 0 0 -2 4
2 1 3 .0 (8 .3 9 )
mm
(inches)
Not to scale
4.1.2
Circumferential Clamping
The IFS 240x sensors can be mounted with a mounting adapter. This type of sensor
mounting offers maximum reliability because the sensor is clamped around its cylindrical
housing. It is absolutely necessary in difficult installation environments, e.g. on machines,
production plants etc.
20 (.79)
10
30 (1.18)
13
MA2400
for sensors 2400/2401
consisting of a mounting
block and a mounting
ring
(.51)
7
(.28)
30 (1.18)
23 (.91)
(.39)
10
M5x0.8 - 6H
Mounti ng ri ng
A
MA 2 4 0 0 - 2 7
B
MA 2 4 0 0 - 5 0
Sensor IFS with mounting adapter
(.39)
MA 2 4 0 0 - 5 9
Di m e n s i on A
Di m e n s i on B
Se nsor
ø2 7 (1 .0 6 )
ø4 6 (1 .8 1 )
IFS 2 4 0 1 -x
ø5 0 (1 .9 7 )
ø6 6 (2 .6 0 )
IFS 2 4 0 0 -1 0
ø5 9 (2 .3 2 )
ø7 5 (2 .9 5 )
IFS 2 4 0 0 -2 4
Fig. 4.1a: Circumferential clamping with MA2400
22 (.87)
5
.
Dia
ø3.4
(.20)
3x M4
Dia. 8
4 (.16)
4.5 (.18)
20 (.79)
Fig. 4.1b: Circumferential clamping with MA2402
optoNCDT2401
(.16)
15 (.59)
Dia.
4 H9
4
4.5 (.18)
11 (.43)
2x M4
1.5±0.1
(.12)
7.5
(.30)
3
3 (.12)
12 (.47)
22 (.87)
3 (.12)
MA2402
for sensors 2402
Tolerances 4 H9: +30 μm
0
15
Installation and Assembly
4.2
Sensor Cable
The sensor and controller are connected with a fiber optic cable. Sensor cables with 50
m (164 ft) length are possible. The user may not shorten or lengthen these fiber optic
cables. Usually, a damaged cable can not be repaired.
Avoid strictly
- any soiling of the connectors,
- mechanical load,
- strong bendings of the cable.
Minimum bending radius: 30 mm (singular)
40 mm (regular).
IMPORTANT!
Remove the protective cap
on the sensor cable only
directly before the assembly in the sensor. This
avoids a contamination of
the optical path.
Mounting steps:
- Loose the protective sleeve at the sensor.
- Lead the sensor cable through the protective sleeve.
- Remove the protective cap on the sensor cable and
keep it.
- Lead the locking pin at the sensor cable into the cavity
at the sensor.
- Screw together sensor cable and sensor.
- Screw the protective sleeve on the sensor.
Then connect the fiber optic
cable to the controller taking
care for correct orientation of
the cable connector.
To disconnect sensor cable:
To remove the optical fiber from its socket first press on the
locking lever, then pull the connector.
optoNCDT2401
16
Installation and Assembly
4.3
Controller Dimensions
When mounting the controller keep the touch keys, connectors and LEDs free for
watching!
168 (6.61)
162 (6.38)
111.5 (4.39)
128 (5.04)
138 (5.43)
optoNCDT 2401
Fig. 4.4: Dimensioned drawing of the controller
4.4
Electrical Connections
4.4.1
Power Supply
Connect the controller with a
power supply (24 VDC/1A). Use
the connector on the front side of
the controller, see Fig. 4.5.
DC24 V (+)
GND
If your controller is equipped with
an external light source, connect
the light source to a mains socket.
Fig. 4.5: Connectors for power
supply
4.4.2
RS232/RS422 Interface
The same connector is used for the RS232
or RS422 interface. The configuration is
done through the 12-pole socket. For
RS422 operation connect pin "5V (+)" and
"RS422", see Fig. 4.6. Do not connect
pin "5V (+)" and "RS422" for RS232
operation.
6 5 4 3 2 1
RS 232
RS 422
USB
5V (+)
RS 422
The RS232/RS422 connector is a RJ11
type connector.
Fig. 4.6: Controller with configured RS422
optoNCDT2401
17
Installation and Assembly
Pin
3
4
5
Name
RX
GND
TX
Description
Receiver
Ground
Transceiver
Tab. 4.1: Pin assignment RS232
Pin
2
3
4
5
6
Name
RX RX +
GND
TX +
TX -
Description
Receiver - (differential input)
Receiver + (differential input)
Ground
Transceiver + (differential output)
Transceiver - (differential output)
Tab. 4.2: Pin assignment RS422
4.4.3
USB Interface
The USB 2.0 connector, see Fig. 4.6, is a standard B-type connector. An USB 2.0 highspeed compliant cable is required.
USB 2.0 works with a transmission rate of circa 40 MBits/s.
IMPORTANT!
Interface with USB 2.0
required
Go to www.micro-epsilon.com/link/opto/2401 and then “IFC Tool“ for an USB driver, see
chap. 6.4.3 also.
4.4.4
Analog Output
The two 0 ... 10V analog outputs are
connected to the 12-pole socket, see Fig.
4.7.
Output 1: Pin 5 and Pin 6 (left to right)
Output 2: Pin 7 and Pin 8 (left to right)
Fig. 4.7: Analog outputs
Zero
AN. OUT 1
GND
AN. OUT 2
GND
The “Zero” button may be used to set the
analog output to zero level.
4.4.5
Synchronization
Input and output for synchronization are
connected to the 12-pole socket, see Fig.
4.8.
Pin 1: Sync in (input synchronization)
Pin 2: GND (ground)
Pin 3: Sync out (output synchronization)
Pin 4: GND (ground)
Fig. 4.8: Connectors for synchronization
optoNCDT2401
SYNC IN
GND
SYNC OUT
GND
Characteristics: TTL, 0 ... 5 V
18
Installation and Assembly
The "Sync out" signal is a TTL signal with measurement rate, which is permanently
available and which does not require any special configuration. One "Sync out" pulse is
emitted for each data point measured. Irrespective of the measuring rate, the "Sync
out" goes high at the end of the exposure time.
Exposure time
10 μs
Sync out
Fig. 4.9: Timing of the "Sync out" signal
4.4.6
Digital I/O, Encoder
Up to three encoders can be connected
to the 20-pole Digital I/O connector, see
Fig. 4.10. Connector type: MDR.
Fig. 4.10: Connector for encoders
Pin
Description
1
2
3
4
5
6
7
20
Ground
A+, Encoder 1
B+, Encoder 1
A+, Encoder 2
B+, Encoder 2
A+, Encoder 3
B+, Encoder 3
+5 VDC
Color
encoder cable IFC2401/2431
blue
white
brown
green
yellow
grey
pink
red
Tab. 4.3: Pin assignment Digital I/O
Pin 8 up to Pin 19 are not connected on the Digital I/O.
optoNCDT2401
19
Electrical signal is a single ended TTL level (+5 V) referenced to
GND.
Track A and B of a single encoder are connected to
A+ and B+ with common GND1.
Max pulse frequency 2.5 Mhz.
Counting pulses:
Track A and B allow the detection of direction,
therefore the encoder pulse can increase or decrease the counter value.
The encoder pulses are not counted as quadrature but
as single pulse. The count value is increased or decreased with each
new pulse of track A.
In order to map the encoder value with a sensor reading,
the counter is updated for a valid signal during 50 % of the exposure of
the sensor.
Max possible counter value before overflow:
2^30 (1,073,741,824)
The counter value can be preloaded with the
$RCD command to 536,870,912.
Data format:
Each encoder reading can be selected as a transmitted
data package.
In binary format a data package consists of 2 bytes as minimum
separated by a 0xFF delimiter (0xFF twice).
A data package is always sent with the High Byte
before the Low Byte.
Since the counter value can reach 2^30, each encoder
value is transferred as 2 packages of a 15bit word. ( low word before
high word, see Chap.6.4.1)
optoNCDT2401
20
Operation
5.
Operation
5.1
Commissioning
- Connect the controller with a power supply, siehe Chp. 4.4.1.
- Connect sensor and controller with the sensor cable (fibre-optic cable).
- Switch on the unit by operating the "Power" switch (see Fig. 2.3).
Startup procedure lasts about 10 seconds. The LED indicators on the front side of the
controller go on and off. At the end of the startup, the sensor starts measuring.
If you use an external light source switch on the light source first, then the controller.
5.2
Displacement Measuring
Position the sensor facing to the target to be measured then slowly advance the sensor
(or the target) to reach SMR which corresponds to the sensor being used. As soon as
the target enters the measuring range of the sensor the LED "Measure", see Fig. 2.3, on
the front panel of the controller indicates it.
Important: The distance values increase as the measurement target moves away from
the sensor.
5.3
Thickness Measurement
In the thickness measuring mode the sensor analyzes two signals reflected from the two
surfaces of a transparent measuring object. The controller calculates the intensity and
displacement of surface 1 (front face, i.e. the nearest face), the displacement and
intensity of surface 2 (rear face), and the thickness.
Align the sensor perpendicularly to the object to be measured. Make sure that the
measuring object is in midrange (= SMR + 0.5 * MR). As soon as the first surface
(displacement 1) is in the measuring range of the sensor the LED "Measure", see Fig.
2.3, on the front panel of the controller indicates it.The LED gives no advice about the
attendance of the second surface in the measurement range of the sensor.
IMPORTANT!
The light beam must be
directed perpendicular onto
the surface of the target to
avoid measuring errors.
Please refer to the technical
data for the maximum tilt
between sensor and
measuring object.
D1
SMR =
Start of measuring range
D2
Thickness
SMR
MR
Fig. 5.1: One-sided thickness measurement against transparent materials
Minimum measurable thickness of material: 8 % of sensor measuring range
Maximum measurable thickness of material: sensor measuring range x material
refrective index of measurement material
For the calculation of a correct thickness value the controller needs the refractive index
of the measuring object. To allow for the spectral variation of the refractive index in the
measuring range the controller features refractive index files.The file contains the changing of the refrective index of a known measurement material inside the measuring
range.
MB =
Measuring range
D 1/2 =
Displacement 1/2
IMPORTANT!
The controller uses the two
strongest peaks for
thickness calculation.
If one surface is outside the measuring range the controller produces only a signal for
the displacement, intensity and barycenter. This can be although too, if a signal is
located below the threshold value. In the default setting (see chap.6.6.24), the controller
transmitts for the displacement 1 and the intensity 1 non-zero values.
The other data items including thickness are set to zero.
optoNCDT2401
21
Operation
5.4
Acquiring the Dark Signal
The dark signal of the sensor represents an intrinsic offset level generated by parasitic
reflections inside the controller, which must be taken into account for the controller to
be able to operate correctly. The level of the dark signal depends on the sampling rate.
The dark signal should be acquired at all sampling rates in order to be able to subtract
it while the controller is measuring. A dark signal acquisition is performed during
adjustment by the manufacturer, but must be repeated at regular intervals.
Procedure:
- Remove the measuring object from the measuring range or cover the sensor with a
piece of paper.
- Press the “Dark” button on the front panel of the controller, see Fig. 2.3.
The LED's "Error", "Intensity" and "Measure" start flashing. This operation lasts a few
seconds. During this time the sensor records the dark signal. When finished, the 3 LEDs
on the front panel of the controller blink on and off simultaneously and show the result
of the dark signal measurement.
Green: Well dark signal
Orange: Dark signal level is too high at low measuring rates, but it is still possible to
measure at higher measuring rates
Red:
Dark signal level is too high at all measuring rates.
- Remove the piece of paper. The sensor can be used in the normal way.
High dark signal
If the color of the blinking LED is orange or red, on completion of the dark signal
acquisition sequence this means that the acquired dark signal is too high. This is
generally caused by one of the following reasons:
- Light was not completely blanked off during the entire operation. In this case, apply
a piece of paper over the sensor and repeat the operation.
- The light level of the used external light source is too high for working with low
measuring rates. In this case you may adjust the light source light level.
5.5
IMPORTANT!
For each measuring rate
the dark signal must be
measured for the first time.
IMPORTANT!
In order to perform a dark
signal acquisition, it is
essential that there is nothing within the measuring
range or even better to
blank off the light beam by
applying a piece of paper
over the sensor.
IMPORTANT!
The controller needs a
warm-up time of at least 15
min. before acquiring the
dark signal.
Analog Output
The controller features two analog outputs (0 ... 10 V) located on the 12-pole socket,
see Fig. 4.7. Both outputs are fully configurable by the operator (see Chap. 6.6.4). The
values were coded with 15 bits internally and output via a DA- converter.
The outputs feature selectively a displacement/thickness measurement or the intensity
signal.
Use the "Zero" button, see Fig. 4.7, to reset the analog output to 0 V. Move the
measuring object to the start of measuring range and press the "Zero" button to stop
the relative measurement.
Notice:
Depending on the measuring mode, see Chap. 6.6.3, the data are output on the
analog outputs.
optoNCDT2401
22
Operation
5.6
Adjustment of the LED Brightness
If your sensor is equipped with an external light source, please skip this chapter.
The LED brightness may be adjusted by "$LED" command, see Chap. 6.6.8. Place a
piece of white paper in front of the sensor and observe the spot of light emitted by
the sensor.
Move the paper forward and backward to find the focus plane where the spot
brightness is maximal. Use the "$LED0" command to disappear the light spot.
The controller features an operation mode (“auto adaptive LED” mode) in which the
LED brightness is automatically adjusted to the signal level. This mode is described in
Chap. 6.6.17.
5.7
Adjustment of the Measuring Rate
Move the measuring object in midrange, see Fig. 2.2. Adjust the measuring rate so that
the signal intensity will be strong but not saturate. For it track the "Intensity" LED, see
Fig. 2.3.
Single frequency mode
Double frequency mode
Off
No signal
No signal
Red
Signal saturated
Signal saturated for both frequencies
Green
Well signal
Well signal
Orange
Signal intensity is low
No relevance
If the "Intensity" LED is red, increase the measuring rate.
If the "Intensity" LED is orange, reduce the measuring rate.
If the signal is saturated at the lowest rate, decrease the LED brightness.
Notice: Always set the measuring rate and the LED brightness so that the “Intensity”
LED is green. When the signal is low (orange “Intensity” LED) or saturated (red
“Intensity” LED) the sensor still measures, but measurement quality may be deteriorated. See Chap. 6.6.2 for detailed informations on the measuring rate adjustment.
5.8
Light Intensity
The controller measures periodically the quantity of light reflected by the measuring
object. The result is a percentual value called intensity. Its value depends on several
parameters:
- Measuring rate controller
- The local slope on the measuring object (angle between the optical axis and the
normal to the surface at the measured point)
- The reflectivity of the sample in subject to the wavelength O 0
- The level of light emission of the LED
- The brightness of the LED in subject to the wavelength O 0
- The response of the photodetector in subject to the wavelength O 0
In standard operation mode (“single frequency”) the exposure time is constant so that
the observed intensity variations are directly related to the intensity reflected from the
sample. In the “double frequency” mode both factors vary at the same time so that the
interpretation of the Intensity data may be difficult. For this reason a new parameter, the
“normalized intensity” is computed. This is an intensity computed for a fixed frequency
(the high frequency), so that it is directly related to the sample characteristics. See the
chapters 5.12 and 6.28 also.
The detected wavelength O 0 varies within the measurement range. Thus the intensity
measured at a given point on the measuring object varies when the measuring object is
moved within the measurement range. For each point in the measuring range, the value
of the intensity of the CMOS line varies between 0 % and 100 %.
optoNCDT2401
23
Operation
Beyond that, the controller is saturated. Saturation is indicated by the "Intensity" LED
(red, see Fig. 2.3). The saturation refers to the original signal of the CCD line.
In the “Double Frequency” mode the “Intensity” LED indicator on the front panel is
correlated to the high frequency.
Summary
- Measurement quality is good when the “Intensity“ LED is green.
- If the LED color is red, increase the measuring rate or lower the LED brightness.
- If the LED color is orange, lower the measuring rate or increase the LED brightness.
5.9
Synchronized Controller and Encoder Data
Synchronization signals and trigger modes are not required for synchronizing the
controller with digital encoder readings: This task is performed automatically by the
controller.
All you need to do is
• Connect the encoders to the “Digital I/O" connector on the front panel as described
in Chap. 4.4.6
• Reset each encoder counter by positioning it at the origin point of the motion range
and sending the “Reset Encoder Counter” (“$RCD”) command, see Chap. 6.6.22.
• Configure the controller to transmit encoder data as well as data measured by the
controller, see Chap. 6.4.
5.10
Triggering
The optoNCDT2401 measurement output is controllable through an external trigger
signal (electrical signal in conjunction with a command). Thereby the anaog and digital
output is affected. Triggering does not influence the preset measuring rate. The
synchronization input, see Fig. 4.8, is used for external triggering. By default, all trigger
modes are disabled and the controller transmits data without interruption immediately
after startup.
5.10.1 Trigger Modes
The measurement output in trigger mode can be controlled with the flange as well as
the level of the trigger signal. Implemented trigger conditions:
- Rising edge,
- Falling edge,
- High level or
- Low level.
Set the trigger conditions (edge or level) with the "$TRF" command (see Chap. 6.6.12).
5.10.2 Trigger Input
The "Sync in" input, see Fig. 4.8, is used for triggering with an external signal (TTL
characteristics). The duration of the "Sync in" pulses should be at least 1.2 μs.
optoNCDT2401
24
Operation
5.10.3 Start Trigger
The simplest trigger mode is the “Start” trigger. It is enabled by sending the “$TRG”
command. On receipt of the command, the controlller stands by for the trigger signal
at the "Sync in“ input, see Fig. 5.2. Once the first "Sync in“ pulse is received, the
controller exits the “Start” trigger mode and resumes to normal operation. Additional
"Sync in“ pulses are simply ignored. If the trigger signal is not sent, the function can be
exit with the sign "$". The controller resumes to normal operation.
$TRG
Sync
Analog output
Digital output
Fig. 5.2: Time schedule of the „Start trigger" function
5.10.4 Level Trigger
In the “Start/Stop on State” trigger mode, data transmission starts and stops according
to the state of the "Sync in“ signal. Use the "$TRF" command to set the active state.
Use the "$CTN" command to stop this trigger mode.
$TRN
Sync
Analog output
Digital output
Fig. 5.3: Time schedule of the level triggering
5.10.5 Edge Trigger
The “Start/Stop on Edge” trigger mode is similar to the “Start/Stop on State”, with one
difference: data transmission starts and stops by successive "Sync in“ pulses and not
by changes in signal state. Use the "$TRF" command to set the active edge. Use the
"$TRS0" command to stop this trigger mode.
$TRS
Sync
Analog output
Digital output
Fig. 5.4: Time schedule of the edge triggering
optoNCDT2401
25
Operation
5.10.6 Latch Trigger
If the “Sync in” signal is received, the controller transmits the data of a preset number
of measured points and stops immediately. If the controller gets the "$TRE0" command, the controller exits the “Latch” trigger mode and resumes to normal operation.
Use the "$CTN" command to stop this trigger mode.
$TREn
Sync
Analog output
Digital output
Fig. 5.5: Time schedule of the latch triggering
5.10.7 Software Trigger
The “STR” command may be used as a software trigger in the “TRE” and “TRS” trigger
modes. Obviously, the software trigger does not have the temporal precision of the
hardware trigger.
Note: The command "STR" is not poosible in the mode "TRN". Use the "TRS" mode
instead.
5.10.8 Maximum Trigger Frequency
The maximum trigger frequency, so the frequency of "SYNC IN"- pulses, is limited by
the time response of controller. The controller needs several cycles for measuring and
converting.
1. Exposing: Gathering of arrived light ( Measuring)
2. Reading: Conversion and storing of light signals as digital values
3. Computation
f max = Maximum trigger frequency
4. Data transmission
M R = Measuring rate
Level and Edge Trigger
T E = Internal process time
A
(Computation, data
transmission)
= Averaging rate
N
= Number of data packets
A
Example
Measuring rate = 2000 Hz, T E = 0.2 ms, A = 1 (without averaging);
f max = 1/(2/2000 + 0.0002)s = 833.3 Hz
Latch Trigger
A
Example
Measuring rate = 2000 Hz, T E = 0.2 ms, N = 5, A = 2;
f max = 1/((1 + 5 * 2)/2000 + 0.0002)s = 175.4 Hz
optoNCDT2401
26
Operation
5.11
Response Time
i
Sync Out
Encoder reading
H
i+1
i+2
i+3
TEXP
Exposure
i-1
i
i-1
i+1
TSO
i+2
i
i+1
i-1
i
i
TEXP
f
e
TSO
TRO
TPR
TRS
i+2
TRO
Reading
i-2
i+1
TPR
Computation
i
i-1
Analog output
i+1
i-2
i-2
i-1
RS232, data transmis-s- T
RS
sion, see $SOD
i
= Counter
= 1/f
= Measuring rate
<<1 μs
= 10 μs
= 0.4 ms
= 80 μs
= Depends on
configuration
i+1
Fig. 5.6: Continuous acquisition, no averaging
Exposure
i-2
i-1
i
TEXP
T x TEXP
TEXP
H
i+1
i+2
Trigger in
i
Sync Out
Encoder reading
i+1
TSO
i
i+2
i+1
TRO
Reading
i
TPR
Computation
i+1
i
i+1
Analog output
i
RS232, data transmission, see $SOD
i+1
TRS
Fig. 5.7: Trigger mode "Start", no averaging
(i)1
Sync Out
Encoder reading
Reading
(i)2
H
(i)3
(i+1)1
(i+1) 2
(i+1)3
TEXP
Exposure
(i-1)
(i)
(i-1) 3
(i)1
(i)2
(i-1) 2
(i-1) 3
(i) 1
TRO
Computation
Analog output
RS232, data transmission, see $SOD
(i-2)
TPR
(i+1)
TSO
(i)3
(i+1) 1
(i)2
(i)3
(i+1)1
(i-1)
TRS
(i+1) 2
(i+1) 3
(i+1)2
(i)
TRS
Fig. 5.8: Continuous acquisition, averaging = 3
optoNCDT2401
27
Operation
Exposure
Sync Out
encoder reading
(i)f1
(i)f2
TEXP1
TEXP2
(i-1)
(i)
(i-1)f2
Reading
(i+1)f1 (i+1)f2
(i)f1
(i+2)f1
(i+2)f2
(i+1)
TSO
(i)f2
(i+1)f1
(i+2)
(i+1)f2
(i+2)f1
(i+2)f2
TRO
(i-1)f1
(i-1)f2
(i)f1
Computation
Analog output
(i)f2
TPR
(i-2)
(i+1)f1
(i-1)
RS232, data transmission, see $SOD
(i+1)f2
(i+2)f1
(i+1)
(i)
(i-1)
(i)
(i+1)
TRS
TRS
TRS
Fig. 5.9: Continuous acquisition, no averaging, double frequency
(i)f1,1
TEXP1
Exposure
Sync Out
Encoder reading
(i)f2,1
(i)f1,2
(i)f2,2
(i+1)f1,2 (i+1)f2,2 (i+1)f1,2
(i-1)
(i)
(i-1)f2,2
(i+1)f2,2
TEXP2
(i)f1,1
(i)f2,1
(i)f1,2
(i+1)
TSO
(i)f2,2
(i+1)f1,1 (i+1)f2,1
(i+1)f1,2
TRO
Reading
(i-1)f1,2
(i-1)f2,2
Computation
Analog output
(i)f1,1
TPR
(i-2)
RS232, data transmission, see $SOD
(i)f2,1
(i)f1,2
(i)f2,2
(i+1)f1,1 (i+1)f2,1
(i-1)
(i+1)f1,2
(i)
(i-1)
(i)
TRS
TRS
Fig. 5.10: Continuous acquisition, averaging = 2, double frequency
5.12
Double Frequency
In this mode the controller adapts itself in real time to the intensity of the signal
received from the sample. This mode is useful for samples characterized by strong,
rapid point-to-point reflectivity variations, such as samples composed of highly
reflective metallic motifs deposited on glass. For such samples it is difficult to select a
measuring rate that is well suited to all measured points, as a rate which gives sufficient
intensity from the glass surface will generate saturation on the metallic surface. Another
example when the “double frequency” mode is useful is that of samples comprising
deep holes or sharp slope variations.
Glass
Metal
Intensity
O
IMPORTANT!
With the operation modes
- Auto-adaptive Dark Signal,
and
- Auto-adaptive Light Source
Brightness
the operation mode double
frequency is not authorized.
Only the query "$DFA? is
authorized.
Fig. 5.11: Intensity distribution
optoNCDT2401
28
Operation
In the “double frequency” mode the sensor switches permanently between 2
frequencies
- low frequency f1 (long exposure time) and
- high frequency f2 (short exposure time).
It computes the data independently for each frequency, and then selects, for each
measured point, the optimal frequency.
The criteria for selecting the optimal frequency are resumed in the following table:
Case
Low frequency
1
Saturated
2
Saturated
3
Saturated
4
Correct measurement
5
Correct measurement
6
No measurement
High frequency
Saturated
Correct measurement
No measurement
Correct measurement
No measurement
No measurement
Selected frequency
high
high
low
low
low
high
Example: Suppose that fL = 100 Hz (low frequency) and fH = 500 Hz (high frequency).
On metallic surfaces the signal at 100 Hz is saturated and the signal at 500 Hz is
correct. So the controller selects the high frequency (500 Hz). On glass substrate
measurements with 100 Hz are correct but with 500 Hz the signal is too low (no
measurement). The controller selects the low frequency. Note that the high frequency is
limited to 1850 Hz.
Each couple of acquisitions (one with long exposure and the other with short exposure)
is called “a cycle”. The sensor delivers one “synchro out” signal per cycle. Measured
data are transmitted once per cycle on the digital outputs and updated once per cycle
on the analog output.
The cycle rate fc is given by the relation: 1/fc = 1/f1 + 1/f2
Intensity
The intensity measured by the sensor depends, on one hand, on the characteristics of
the sample like reflectivity, slope (see Chap. 5.8) and on the other, on the exposure
time. In standard operation mode (“single frequency”) the exposure time is constant so
that the observed intensity variations are directly related to the intensity of reflected
from the sample. In the “double frequency” mode both factors vary at the same time so
that the interpretation of the Intensity data may be difficult. For this reason a new
parameter, the “normalized intensity” is computed. This is an intensity computed
for a fixed frequency (the high frequency), so that it is directly related to the sample
characteristics.
Arrangement:
- ILF is the intensity measured for the low frequency
- IHF is the intensity measured for the high frequency
The following table shows the difference between the “raw” (standard) intensity and the
“normalized” intensity.
Available intensities in « Double Frequency » mode
Selected Frequency
« Raw » Intensity
« Normalized » Intensity
Low (f1)
ILF
ILF * f1/f2
High (f2)
IHF
IHF
By default, the transmitted Intensity data is the “Normalized” one. This option may be
modified using the “DFI” command.
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Compatibility with other commands/modes
This mode is compatible with most other commands and modes, and in particular with
- triggering,
- averaging and
- manual setting of the LED brightness.
It is not compatible with
- auto-adaptive light source brightness, Chap. 6.6.17
- auto-adaptive dark signal, Chap. 6.6.16
- spectral averaging, Chap. 6.6.10
- fast dark signal, Chap. 6.6.6.
Response when the controller is in “double frequency”
mode
AAL, ADK, FDK, AVS
Not authorized
DRK
Authorized
TRG, TRE, TRN, TRS, TRF Authorized
AVR, HLV
Authorized
LED
Authorized
Command
FRQ, TEX, SRA
6.
Authorized. Variables can be modified during double
frequency mode. The controller operates with the new
values, if the controller quits the double frequency
mode.
Serial Interface
The controller features two types of serial interfaces for controlling the controller and
measurement output. The following chapter describes this possibilities for the RS232/
RS422. The command language, the data transmission format are identical for the two
types of serial interfaces.
When switched on, the controller transmits data according to the last configuration. On
receipt of character "$" the controller stops sending data and waits for the remaining
command characters. Each received character (including $) is echoed back. If the
command includes parameters, the final "CR" character is echoed as well. When the
controller receives a complete command and has completed the corresponding
actions, it returns the string „ready CRLF“ and switches back to normal operation.
Received command is illegal:
response is echo+ “invalid code<CRLF>“
Received command is legal put parameter values are illegal:
response is echo + “not valid<CRLF>“.
Command and its parameters are legal but execution has failed:
response is echo +””error<CRLF>“.
The "HyperTerminal®" program contains a user-friendly surface for serial communication
with the controller, see Chap. 6.8.
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Serial Interface
6.1
Data Format
Controller and PC need the same data transmission settings.
Transmission rate: As high as possible 1
Data format: 8 data bits, no parity, one stop bit
1) The controller offers
baud rates up to 460.8
kBaud. Note that standard
PC COM ports (COM1,
COM2) are limited to 115.2
kBaud.
The "Baud rate” command sets the baud rate of the controller.
Baud rate
Function Set/request the controller baud rate
Format
$BAUn or $BAU?
Parameter n = 9600, 19200, 38400, 57600, 115200, 230400 or 460800
Note that this command has no effect on the PC baud rate that should be set
independently.
Limitation of the baud rate
The maximum number of data values inside a frame transmissible simultaneously per
measured point via the serial interface depends on the controller measuring rate and on
the interface baud rate. As far as possible, the highest baud rate available should be
used. The tables below specify the data value transmission capability according to the
interface baud rate and the measuring rate.
Measuring rate
100 Hz
200 Hz
500 Hz
1000 Hz
2000 Hz
9600
1
_
_
_
_
19200
3
1
_
_
_
Baud rate
57600
115200
9
16
4
9
1
3
_
1
_
_
230400
16
16
7
3
1
460800
16
16
15
7
3
Tab. 6.1: Max. number of transmissible data values in ASCII format
Measuring rate
100 Hz
200 Hz
500 Hz
1000 Hz
2000 Hz
9600
3
1
_
_
_
19200
8
3
_
_
_
Baud rate
57600
115200
16
16
13
16
4
10
1
4
_
1
230400
16
16
16
10
4
460800
16
16
16
16
10
Tab. 6.2: Max. number of transmissible data values in binary format
Example: If you want to transmit displacement and intensity (2 data values per
measured point) at 1000 Hz, use the ASCII mode with a baud rate of at least 230400 or
use the binary mode with a baud rate of at least 115200.
In case the number of transmitted packets specified by the "SOD" command exceeds
the limit, the “Error” led turns to orange and the “data overflow” bit in the “State” data
is set.
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Serial Interface
6.2
Command Syntax
-
Every command transmitted to the sensor must start by a "$" character.
Every command must end with a "<CRLF>" (carriage return, line feed) sequence.
Command name consists of 3 capital case letters.
When a command has one or more parameters, the parameters come immediately
after the command name.
- There should be no comma between the name of the command and the first
parameter.
- When a command includes several parameters, the parameters are separated by
commas.
- For a query the parameter is replaced by “?”
6.3
Data Transmission Formats
The sensor provides the ASCII format and the binary format for data transmission.
6.3.1
ASCII
ASCII
Function Configure the controller to ASCII transmission format
Format
$ASC
Response None
In ASCII format, 5 characters (digits) are transmitted for each data value. The data
values inside a frame are separated by commas, and the successive frames are
separated by <LFCR> sequence.
Example:
Measuring mode: Thickness
Data selected: Thickness, Displacement 1, Displacement 2
The data values inside a frame are identified as A, B, C etc. Frame separation with
<LFCR>.
The table below shows the first 36 characters transmitted.
x
x
x
x
x
Thickness - A
1 2 3 4 5
x x x
x x
Displacement 2 - A
13 14 15 16 17
,
Data value separation
6
LF
CR
Frame separation
18
19
x
x
x
x
x
,
Displacement 1 - A Data value separation
7 8 9 10 11
12
x
x
x x
x
Thickness - B
20 21 22 23 24
X = digit (0 ... 9)
,
x
x x
x x
,
x x
x x
x
Data value separation Displacement 1 - B Data value separation Displacement 2 - B
25
26 27 28 29 30
31
32 33 34 35 36
Tab. 6.3: String of an ASCII data transmission
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Serial Interface
6.3.2
Binary
Binary
Function Configure the controller to binary transmission format
Format
$BIN
Response None
Each data value (16 bit data item) transmitted by the controller is coded with two
successive bytes (first H-Byte, then L-Byte). Successive frames are separated by two
consecutive bytes <0xFF>.
The data item is comprised of two consecutive bytes (H-byte/L-byte).The byte is
additionally provided with a "0" as MSB.
Start
1
7 Bit H-Byte
Stop
Start
0
7 Bit L-Byte
Stop
Conversion of the binary data format:
For conversion purposes the high and low bytes must be identified, The MSB in the
H-Byte deleted and the remaining 15 bits compiled into 15 bit data item.
Reception:
H-Byte
L-Byte
0
D7
D14
D6
D13
D5
D12
D4
D11
D3
D10
D2
D9
D1
D8
D0
Result of conversion:
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Example:
Measuring mode: Displacement
Selected data: Displacement, Intensity
The data values inside a frame are labeled with A, B etc.
The table below shows the first 12 bytes transmitted.
H-Byte L-Byte
Displacement - A
1
2
H-Byte
L-Byte 0xFF
0xFF
H-Byte L-Byte
Intensity - A
Frame separation Displacement - B
3
4
5
6
7
8
H-Byte
L-Byte 0xFF
0xFF
Intensity -B
Frame separation
9
10
11
12
Tab. 6.4a: String of a binary data transmission
Note: The MSB for a data item can not be 0xFF, because all the data are encoded
either with 12 bits or with 15 bits. Thus if three successive 0xFF bytes appear in the
data flow, the first 0xFF is necessarily the LSB for a data value and the next two 0xFF
constitute the frame separator.
Example:
Measuring mode: Displacement
Selected data: Displacement, Intensity, Encoder 2
The data values inside a frame are labeled with A, B etc.
The table below shows the first 12 bytes transmitted.
H-Byte
L-Byte
Displacement - A
1
2
H-Byte
L-Byte
Intensity - A
3
4
H-Byte L-Byte
Encoder 2
lower 15 bit
5
6
H-Byte
L-Byte
Encoder 2
higher 15 bit
7
8
0xFF
0xFF
Frame
separation
9
10
H-Byte
L-Byte
Displacement - B
11
12
Tab. 6.4b: String of a binary data transmission
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Serial Interface
6.4
Transmitted Data
6.4.1
Available Data
The controller measures several data values in parallel at each measured point of the
measuring object. The table below shows the available data values for both measuring
modes.
The controller combines the maximum of 16 different data values to a measured point
in a frame.
Data value index
Displacement
Thickness measurement
0
1
2
3
4
5
6
Displacement
not used
Current LED brightness
Intensity
not used
not used
Barycenter
Thickness
Displacement 1st surface
Displacement 2nd surface
Current LED brightness
Intensity 1st surface
Intensity 2nd surface
Barycenter 1st surface
7
8
9
10
11
12
13
14
15
not used
State
Counter
Encoder 1 = lower 15 bit
Encoder 1 = higher 15 bit
Encoder 2 = lower 15 bit
Encoder 2 = higher 15 bit
Encoder 3 = lower 15 bit
Encoder 3 = higher 15 bit
Barycenter 2nd surface
State
Counter
Encoder 1 LSB
Encoder 1 MSB
Encoder 2 LSB
Encoder 2 MSB
Encoder 3 LSB
Encoder 3 MSB
Tab. 6.5: Summary of all available data values
6.4.2
Meaning of the Data
Measuring mode displacement:
- Displacement is the distance between measuring object and sensor less SMR.
- Intensity is the signal level as percentage of the dynamic range of the controller.
- Barycenter is the position of the spectral peak on the internal photodetector.
Measuring mode thickness measurement:
- There are two displacement values, two intensity data and two barycenter data for
the two surfaces of the measuring object and one thickness value. Surface one is the
one closer to the sensor.
D
SMR
MR
D = Displacement
SMR = Start of measuring range
MR = Measuring range
The encoder counter data allows reading of digital encoder synchronously with the
controller data.
The counter, auto-adaptive mode data and state data are described in Chap. 6.5.4.
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Serial Interface
6.4.3
Data Selection
The "Set Digital Output Data" command enables the user to determine the content of a
frame to be transmitted.
Function
Format
Set Digital Output Data
Set/request the data to be transmitted
$SODn0,n1,n2,n3,n4,n5,n6,n7,n8,n9,n10,n11,n12,n13,n14,n15
or $SOD?
Ni = 0 (Data are not transmitted)
Ni = 1 (Data are transmitted on the RS232/422 interface)
Response
Ni = 9 (Data are transmitted on the USB interface)
i = 0 … 15 (Index data item)
Note: The last null values may be omitted for convenience, e.g.
$SOD1,0,0,1,0,0,0,0,0,0,0,0,0,0,0 may be replaced by $SOD1,0,0,1.
IMPORTANT!
On the RS232/422 interface
the transmission capacity
depends on the measuring
rate and the data format.
Before sending the $SOD
command, check that the
number of data items
selected is compatible with
these parameters in order
to avoid data overflow.
Examples:
- In the displacement measuring mode the displacement value and the intensity (see
Tab. 6.5) should be transmitted for each measured point via the RS232/422 interface.
The following command must be sent to the controller:
$SOD1,0,0,1,0,0,0,0,0,0,0,0,0,0,0 (or $SOD1,0,0,1).
- In the displacement measuring mode the displacement value (see Tab. 6.5) should
be transmitted for each measured point via the USB interface. The following
command must be sent to the controller: $SOD9,0,0,0,0,0,0,0,0,0,0,0,0,0,0 (or
$SOD9).
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Serial Interface
6.5
Data Decoding
6.5.1
Displacement Measuring Mode
To obtain the displacement in μm, use the following relationship:
Displacement (μm) = (Transmitted value : 32767) x MR (μm)
Note: The displacement value is encoded with 15 bits (0 ... 32767).
6.5.2
Thickness Measuring Mode
To obtain the displacement and thickness in μm, use the following relationships:
Thickness (μm) = (Transmitted value : 32767) x MR (μm) x K
The transmitted value is already set off against the refractive index. You may change the
refractive index with the command $SRI. In order to optimise the output resolution, the
displacement data scale in the thickness measuring mode is different than that in the
displacement measuring mode. The reason for this difference is that the effective
measuring range in thickness measuring mode is
multiplied by the refractive index.
Note: The thickness value and the displacement values are encoded with 15 bits (0 ...
32767).
IMPORTANT!
Default setting for the scale
factor K is 2.0. Use the
$CEE command to change
this value.
K ≤ 5.
Displacement 1st surface (μm) = (Transmitted value : 32767) x MR (μm) x K
Displacement 2nd surface (μm) = (Transmitted value : 32767) x MRh (μm) x K
The K parameter may be modified. This is required in the rare situation when the
refractive index of the sample to be measured is greater than 2.0.
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Serial Interface
6.5.3
Decoding the Barycenter Values
To obtain the position of the barycenter in pixels, use the following relationship:
Barycenter = (Transmitted value : BS) + BO
The Position of the spectral peak on the photodetector signal is encoded with 15 bits
(0 ... 32767).
BS = Barycenter scale
BO = Offset
Default setting:
BS = 32 ($CEB),
BO = 520 ($CRB)
6.5.4
Decoding the State Data
The state data is an aggregate of various flags.
Bit
Flag
Bit
Flag
0
HLV barycenter 2nd surface
8
1
2
3
4
5
6
7
HLV barycenter 1st surface
HLV displacement 2nd surface
HLV displacement 1st surface
HLV thickness
HLV Intensity 2nd surface
HLV Intensity 1st surf ace
Saturation f lag
9
10
11
12
13
14
15
Selected frequency 1
Error light source test
Data overflow RS232/422 transmission
0
HLV = Hold last value
Tab. 6.6: State informations from the controller
The HLV bits are set if the corresponding data are not measured but hold as last valid
value in “Hold last value” mode.
The saturation flag indicates a signal saturation and refers to the original signal of the
CCD sequence. It is set at the same time when the “Intensity” LED color turns to red.
1) The “selected frequency” flag is significant on double-frequency mode only.
0 indicates that the high frequency was selected,
1 indicates that the low frequency was selected.
Note: This bit replaces the “Trigger Flip-flop” bit of previous versions.
The “light source test failure” flag indicates that the light source should be replaced.
Note that this bit is set at the same time as the “Error” LED turns red. If the light source
test is disabled, this bit is always zero.
The “data overflow” flag indicates that the number of transmitted data directed to the
RS232/RS422 port exceeds the maximum number of transmissible data. This bit is set
at the same time as the “Error” LED turns orange.
Counter Data
The counter data is an aid for software developers who wish to check that there is no
data loss in their acquisition software. The 15 bit counter is reset each time a trigger
command (TRE, TRN, TRS or TRG) is sent.
Auto-Adaptive Mode
In the “auto-adaptive rate” mode this data contain the instantaneous LED brightness
coded with 8 bits (0 ... 255). This may be useful for analyzing the relative intensity of
the signal returned from the measuring object as in this mode the intensity data is
practically constant.
Relative Intensity = Intensity : n
n = Auto adaptive mode data value
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Serial Interface
6.6
Commands
6.6.1
Sensor Selection
The controller may accept up to 20 calibration tables corresponding to 20 different
sensors. Before a measurement is performed the controller needs the information which
sensor is connected.
Function
Format
Parameter/
Value returned
Example
Select confocal sensor
Set/request the sensor type
$SENn or $SEN?
n = calibration index, corresponds to a two digit integer between 0
and 19
$SEN05
This command is used to obtain the measurement range of the sensor currently
selected.
Scale
Function
Request the currently used measuring range
Format
$SCA
Value returned Measuring range in microns
6.6.2
Measuring Rate
The measuring rate of the controller may be managed by two methods.
- Selection of a preset measuring rate from a list (“Preset Rate”)
- Definition of a specific measuring rate (“Free rate” or “Exposure Time”)
The first method, which is simple and easy to use, is recommended for most
applications. In this method, the sampling rate is defined by its index. The second
method provides greater flexibility in the choice of the measuring rate:
The “free” measuring rate can be specified in Hz, or the exposure time (inverse of the
free rate) can be specified in μs. This chapter describes the different methods, followed
by some examples.
Selecting a preset Measuring Rate
The controller provides 5 preset sampling rates.
Index
00
01
02
03
04
05
Measuring rate (Hz)
free rate
100
200
400
1000
2000
Exposure time (μs)
free exposure time
10000
5000
2500
1000
500
Tab. 6.7: Measuring rates and related exposure times in the controller
Function
Format
Parameter/
Value returned
Preset rate
Set/request the index of a preset measuring rate
$SRAn or $SRA?
n = measuring rate, corresponds to a two digit integer between 0
and 5
Note: The "$SRA00" command selects the free measuring rate. The free rate may be set
by the “Free rate“ command or by the “Exposure time“ command described below.
Free Measuring Rate
The ‘Free Rate’ command is used to set the controller measuring rate to a free value
between 100 Hz and 2000 Hz, or to request the value of the free rate. The index of the
free rate in the list of preset rates is 00 (see Tab. 6.7). The last value set to the free
rate or the exposure time may be later activated by sending “$SRA0”.
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Serial Interface
Note: The controller may modify slightly the specified value of the free rate in order to
comply with its internal constraints (the exposure time in μs should be an integer) and
returns the real value immediately after the echo.
Free rate
Set/request the value in Hz attributed to the free rate
$FRQn or $FRQ?
n = value of the free sampling rate, in Hz (5 digit integer between
100 and 2000
Value returned m ( 5 digit integer between 100 and 2000) is the closest rate
value m>=n such that the exposure time in μs is an integer
Function
Format
Parameter
Example
Command: $FRQ1995
Response: $FRQ1995 1996
Explication: 1996 Hz corresponds to an integer exposure time (501
μs).
Exposure Time
The ‘Exposure time’ command is used to set/request the free exposure time in the
controller. Specify any integer exposure time between 00500 and 10000 μs.
The free measuring rate is set to 1 000 000/exposure time (μs).
Exposure time
Set/request the exposure time
$TEXn or $TEX?
n = value of the free exposure time, in μs (5 digit integer between
00500 and 10000)
Function
Format
Parameter
Examples
The following table contains the commands “Preset Rate”, “Free Rate” and “Exposure
Time” alternately used and interrogates the controller to view the results of each
command.
Command
$SRA04
$SRA?
$FRQ?
$TEX?
$TEX00530
$FRQ?
$FRA?
$FRQ1995
$TEX?
$TEX00120
$SRA01
$FRQ?
$SRA00
$FRQ?
Comment
Sets the preset measuring rate index to 4 (1000 Hz)
Interrogates the controller for the index of the current
preset measuring rate
Interrogates the measuring rate in Hz
Interrogates the exposure time in µs
1000 = 1 000 000 / 1000
Sets the exposure time to 530 µs
(and sets the measuring rate index to 0)
Interrogates the measuring rate in Hz
1886 = 1 000 000 / 530
Interrogates the current measuring rate index
Sets the free measuring rate to 1995 Hz
The controller selects a close value of 1996 Hz
Interrogates the exposure time in µs
501 = 1 000 000 / 1996
Attempts to set the exposure time to a non-authorized value
Sets the preset measuring rate index to 1 (100 Hz)
This ends the “free rate” mode
Interrogates the measuring rate in Hz
Sets the measuring rate index to 0 (= free measuring rate)
Interrogates the measuring rate in Hz, 1996 Hz is the last
value attributed to the free measuring rate
Sensor response
$SRA04 <CR> ready
$SRA?04 ready
$FRQ?01000 ready
$TEX?01000
$TEX00530 <CR> 00530 ready
$FRQ?1886
$FRA?00 ready
$FRQ1995 <CR> 1996
$TEX?00501
$TEX120 not valid ready
$SRA01 <CR> ready
$FRQ?00100 ready
$SRA00 <CR> ready
$FRQ?1996
Tab. 6.8: Instruction sequence to the controller Befehlsfolge an den Controller and the effects on it
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Serial Interface
6.6.3
Displacement and Thickness Measurement
This command allocates a measuring mode to the controller.
Index
0
1
Measuring mode
Displacement measuring
Thickness measuring
The "Mode" command is used to set/request the index of the current measuring mode.
Mode
Function
Set/request the current measuring mode
Format
$MODn or $MOD?
Value returned n = measuring mode index (0 or 1)
6.6.4
Analog Output
Configuring an analog output consists:
- specifying the data item (displacement, thickness, intensity etc.) to an output,
- output scaling, inverting
Function
Format
Parameter
Analog Output
Sets the analog output characteristic
$ANAn,m,p,q
n = ID of Analog output to configure (0 or 1)
m = ID of the data item (0 … 7), see Chap. 6.4.1
p = Start value for Vmin (0 V)
q = End value for Vmax (10 V)
Conditions: 0 <= p < q <= measuring range in μm
0 <= p < q <= 2 * measuring range in μm
0 <= p < q <= 100
Output characteristic
p<q
p>q
(displacement)
(thickness)
(Intensity)
Example for displacement measuring mode:
$ANA0, 0, 00000, 05000
Scaling, 10 V corresponds to data 0 ≥ 500 μm
Scaling, 0 V corresponds to data 0 = 0 μm
Displacement
Analog output 1 (AN.OUT1)
Analog Output
Function
Requests the analog output characteristic
Format
$ANA?
Value returned $ANAm0,p0,q0,m1,p1,q1
m0 = Data item, analog output 1 (0 … 7)
p0 = Start value for Vmin (0 V)
q0 = End value for Vmax (10 V)
m1 = Data item, analog output 2 (0 … 7)
p1 = Start value for Vmin (0 V)
q1 = End value for Vmax (10 V)
IMPORTANT!
Invert analog output:
p>q
Example:
$ANA0, 0, 05000, 00000
The command $AVR does
not effect the analog output.
Example for displacement measuring mode:
$ANA?0, 00000, 10000, 3, 00000, 00100 ready
Scaling, 10 V for the value ≥ 100 %
Scaling, 0 V for the value 0 %
Intensity value on analog output 2 (AN. OUT2)
Scaling, 10 V for the value ≥ 10000 μm
Scaling, 0 V for the value 0
Displacement value on analog output 1 (AN. OUT1)
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Serial Interface
6.6.5
Dark Signal
See Chap. 5.3 to get detailed information on the "Dark Signal" function. This signal
depends on the sampling rate: it increases with the exposure time (reciprocal of the
sampling rate).
Acquiring and saving the dark signal
The "Dark" command records and saves the dark signal in the FLASH memory of the
controller for all sampling rates in succession. If the level of the dark signal is too high
for low rates, the controller returns the index of the lowest measuring rate which is
usable (see "Set Sampling rate" command), and lower sampling rates are inhibited.
When finished, the controller returns to the last sampling rate used before dark signal
acquisition.
Function
Dark
Acquire and save dark signal
Format
$DRK
Value returned Index of the lowest sampling rate usable
Getting the minimal rate authorized after dark signal acquisition
The "Minimal Rate" command is used to get the minimal measuring rate authorized
after last dark operation.
Minimal rate
Function
Get the minimal authorized measuring rate (query only)
Format
$FRM
Value returned Lowest measuring rate in Hz
6.6.6
Fast Dark Signal
The "Fast Dark" command only refreshes the dark signal for the current measuring rate,
without saving the acquisition in the EEPROM. If the dark signal measured is too high,
the controller returns a "not valid <CRLF>" string and the previous dark signal
continues in use.
This command has two optional arguments:
-n
is an integer indicating the number of successive acquisitions to be averaged in
order to obtain the reference dark signal (default value = 40).
- m indicates the influence of the acquisitions made on the new reference dark signal
according to the formula:
New dark signal = (m x reference dark signal + (100 - m) x old dark signal)
Fast dark
Acquire the dark signal for the current measuring rate only without
saving in the controller
Format
$FDK or $FDKn,m
Parameter/
n = averaging factor for dark signal, range 1 … 99
Value returned m = weighting factor, range 1 … 100
Returns "Ready" or "Not valid"
Function
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Serial Interface
6.6.7
Refractive Index
The measuring object refractive index is necessary in the “Thickness” measuring mode.
Setting a constant refractive index
Function
Fo rmat
Value returned
Example
Set/request the measuring o bject refractive index
$SRIx o r $SRI?
x = refractive index, up to fo ur decimal digits
$SRI1.5142
Selecting a refractive index file
Refractive index files are used to describe the variation of refractive index within the
measuring range. The “Refractive index file” command is used to load a previously
saved refractive index file.
Function
Format
Parameter
Refractive index file
Load the refractive index file
$INFn
n =0: constant refractive index (determined by last SRI command)
n = 1 … 8: ID of an existing refractive index file
Value returned s: material name
x1,x2: the minimal and maximal refractive index values in the file
Command: $INF3 or $INF?
Response: $INF3,"BK7", 1.5090, 1.5253
Example
Command: $INF0
Response: $INF0,"CONSTIND", 1.520, 1.520
IMPORTANT!
Refractive index files allow
specifying the variation of
the refractive index of a
given measuring object
within the measuring range.
The refractive index file
names are up to 8
characters long and have
the “ind” suffix.
They are generated by
measuring a sample whose
thickness is known.
Note: Note the material name “CONSTIND” is attributed in case the file ID is 0.
6.6.8
Light Source Brightness
This command is exclusively possible for users, who do not use an external light
source.
LED brightness
Function
Set/request the light source brightness
Format
$LEDn or $LED?
Value returned n = brightness level, range 0 … 100
For each frequency there exists a minimal brightness level below which the LED cannot
go:
Measuring rate
Up to 500 Hz
500 Hz … 2000 Hz
Minmal brightness level Maximal brightness level
10 %
100 %
25 %
100 %
$LED0 – puts the LED off
$LEDX with X x minimal level sets the LED to the minimal level
$LEDX with X > minimal level sets the LED to level X.
6.6.9
Averaging
The averaging of the measurements by the controller improves the signal noise ratio.
When the averaging factor is greater than 1, the controller transmits data in accordance
with the following formula:
fT = fS / M
optoNCDT2401
fT = Data transmission rate
fS = Measuring rate
M = Averaging factor
42
Serial Interface
Thus for a measuring rate of 1000 Hz and an averaging factor of 10, the sensor provides
100 measurement points per second. In order to obtain measurements without
averaging, set the averaging to 1.
Averaging is especially useful for ambitious measuring objects, for which the signal is
low even at the minimum measuring rate. Sometimes averaging is used simply to
reduce the data transmission rate. The command $AVR does not effect the analog
output.
Data averaging
Function
Set/request data averaging
Format
$AVRn or $AVR?
Parameter/
n = averaging, range 1 … 1000
Value returned
IMPORTANT!
Do not use high averaging
for moving samples. This
reduces the transverse
resolution and may cause
false measurements.
IMPORTANT!
The controller calculates
arithmetic averages.
6.6.10 Spectral Averaging
The averaging is performed on the photodetector signals before processing.
Function
Spectral averaging
Set/request spectral averaging
Format
$AVSn or $AVS?
n = averaging, range 1 … 999
Parameter/
Value returned
6.6.11 Hold Last Valid Value
The “Hold last value mode” command is useful for measuring objects with a great
number of non measurable points, due to large local slopes or due to a very low
reflectivity. When measuring such samples it may be convenient that the value delivered
for those positions will not be zero. Instead, the sensor sends the last valid value.
Note: If a measurement can not be calculated from the given data and the last
measured value is transmitted the corresponding "Hold last value" bit in the status data
is set.
Function
Hold last value
Set/request max. number of points for "Hold last value mode"
Format
$HLVn or $HLV?
Parameter/
n = max number of points to hold, range 1.. 999
Value returned
6.6.12 Trigger Functions
Start Trigger
The "Start Trigger" command switches the controller into standby mode, waiting for a
trigger signal at the "Sync in“ input (see Chap. 4.4.5).
As soon as a rising edge or a falling edge1, whichever has been selected by the “Select
active edge” command is detected at the "Sync in“ input, the controller starts
measuring with a delay of 1 exposure time (exposure time {μs} = 1000000/measuring
rate) and a repetition time of 1.2 μs.
Note: The emission of “Sync out” signals stops and restarts together with data
transmission.
Function
Format
optoNCDT2401
1) Setup by the
command "Select active
edge"
Start trigger
Put the controller on standby pending receipt of an external trigger
signal. Upon receipt of the trigger signal, the controller starts
measuring at the programmed measuring rate.
$TRG
43
Serial Interface
Following a "Start Trigger" command it is possible to disarm the trigger and restart
acquisition without receiving a trigger pulse using the "Continue" command or transmit
the string "$" to the controller.
Function
Continue
Disarms the start trigger function and resumes normal operation
Format
$CTN
Parameter/
None
Value returned
Level Trigger
The "Start/stop on state" command switches the controller into standby mode for level
triggering, waiting for a trigger signal at the "Sync in“ input (see Chap. 4.4.5). Data
transmission is enabled when the “SYNC IN” signal is in the active state. The active
state (high or low) is determined by the “TRF” command.
Function
Start/stop on state
Enable/Disable data output through state triggering on the "Sync
In" input
Format
$TRNb
Parameter/
b = 1/0
Value returned
Pulse rate
See Chap. 5.10.8
Note: On each transition of the “Sync in” signal from non-active state to active state,
the “flip flop” bit in the state data changes.
Edge Trigger
The "Start/stop on edge" command switches the controller into standby mode for edge
triggering, waiting for a trigger signal at the "Sync in“ input (see Chap. 4.4.5). Data
transmission is enabled and disabled alternatively by successive “Sync in” pulses. Use
the "TRS" command to define the edge characteristics.
Function
Start/stop on edge
Enable/Disable data output through edge triggering on the "Sync
In" input
$TRSb
b = 1/0
Format
Parameter/
Value returned
Pulse rate
See Chap. 5.10.8
Note: On each second “Sync in” pulse the “flip flop” bit in the state data changes.
Software Trigger
The “STR” command may be used as a software trigger in the “TRE” and “TRS” trigger
modes. Obviously, the software trigger does not have the temporal precision of the
hardware trigger.
Software trigger
Function
Replaces the hardware trigger in the "TRE" or "TRS" modes
Format
$STR
Parameter/
Returned
None
Note: In the “TRG” mode, the $ sign or “$CTN” command may be used as software
trigger. If you wish to use the software trigger avoid the “TRN” mode. Use the “TRS”
mode instead.
optoNCDT2401
44
Serial Interface
Latch Trigger
The "Latch Trigger" command is similar to the “Start trigger” command with the
following difference: When the “Sync in” signal is received, the controller transmits the
data of a preset number of measured points and stops immediately. Each successive
“Sync in” signal triggers the transmission of a new group of data packets until the
mode is disabled with the "Restart acquisition" command.
Latch trigger
Enable/Disable the “Latch” trigger and determine the number of
points to latch.
Format
$TREn (enable mode) or
$TRE0 (disable mode)
Parameter/
n = number of points to latch on each "Sync in" pulse,
Value returned range: 1 … 9999
pulse rate
see chapter 5.10.8
Function
Note: On each “Sync in” pulse the “flip flop” bit in the “State” data changes.
Edge or Level Trigger
The measurement output in trigger mode can be controlled with the edge as well as
the level of the trigger signal. Implemented trigger conditions:
- Rising edge,
- Falling edge,
- High level or
- Low level.
Active edge/active state
Determines the active edge for the commands TRG, TRE, TRS
Determines which state is active for the TRN command
Format
$TRFb
Parameter/
b = 0 for rising edge and high state
Value returned b = 1 for falling edge and low state
Function
6.6.13 Get Controller Configuration
The “Get Setup” command is used for interrogating the controller on its current
configuration.
Get setup
Function
Request the current configuration
Format
$STS
Value returned String
Configuration e.g. in displacement mode, see also Chap. 6.6.3:
SRA03,MOD0,SEN04,ASC,AVR3,SOD1,0,0,1,ANA0,0,32767,3,0,4095,SCA300 ready
Measurement range sensor
Analog output, see Fig. 6.2
Data to be transmitted, Chap. 6.4.1
Averaging
Transmission format
Sensor type
Operation mode
Measuring rate
Fig. 6.1: Decoded controller configuration
optoNCDT2401
45
Serial Interface
... ANA 0 0 32767 3 0 4095 ...
Value for 10 VDC, Analog OUT 2
Value for 0 VDC, Analog OUT 2
Intensity, Analog OUT 2
Value for 10 VDC, Analog OUT 1 (End of measuring range)
Value for 0 VDC, Analog OUT 1 (Start of measuring range)
Displacement, Analog OUT 1
Fig. 6.2: Decoded analog output configuration
6.6.14 Detection Threshold
This command is used to adjust the detection threshold for the optical signal. This
threshold defines the minimum intensity, below which the controller will not detect any
signal.
By default, this threshold is set to the value 0.03. If it is known that the intensity of the
signal is very low, the detection threshold can be lowered in order to be able to detect
very low peaks. In case of false measurements, e.g. measurement when no measuring
object is in the measuring range, the detection threshold should be
increased.
Threshold for displacement measurement
Detection threshold in distance measuring mode
Function
Set/request the threshold
Format
$MNPx or $MNP?
Parameter/
x between 0 and 1, e.g. $MNP0.03
Value returned
Threshold for thickness measurement
In the thickness measurement mode there are 2 detection thresholds:
- Threshold for strong signal peaks
- Threshold for weak signal peaks.
By default both are set equal, however, depending on measuring object characteristics,
it may be necessary to set two distinct values.
Note that often the optimal value for the thickness measuring mode detection threshold
for the stronger peak is about 50% higher than that of displacement measuring mode.
Function
Format
Parameter/
Value returned
Funktion
Format
Parameter/
Value returned
optoNCDT2401
Detection threshold strong peak, thickness
Set/request the threshold for strong signal peaks
$SPPx or $SPP?
x between 0 and 1, e.g. $SPP0.05
Detection threshold weak peak, thickness
Set/request the threshold for weak signal peaks
$SDPx oder $SDP?
x between 0 and 1, e.g. $SDP0.03
SPP applies to the
stronger peak (not the
nearest) and SDP to the
second-strongest peak,
so that logically SDP
should be smaller than
SPP.
46
Serial Interface
6.6.15 Light Source Test
The role of the light source test is to indicate when the light source should be replaced.
The series 2401 and 2402 controller use a LED with a very long life time, this test is not
required. However MICRO-EPSILON recommends to enable the test for controllers with
an external light source.
Enable/Disable the light source test
Function
Format
Parameter/
Value returned
Activation of the light source test
Enable/Disable the light source test
$SLPb or $SLP?
b = 1 or 0
Threshold level
The light source test requires a light-level below which the test fails and the “Error” LED
turns red. The threshold is adjusted using the CSL command.
Function
Threshold for light source test
Set/request the threshold level for the light source test
Format
$CSLn or $CSL?
Parameter/
n = 0 ,,, 9999
Value returned
6.6.16 Auto-adaptive Dark Signal
In this mode the controller measures automatically the fast dark signal (see also Chap.
6.6.6) and adapts it permanently. To do so, the controller analyses the internal
photodetector signal, determines the zone occupied by the signal, and adapts the fast
dark signal in all other zones.
This mode is particularly useful for external light sources whose brightness varies with
temperature and with aging.
Function
Format
Parameter/
Value returned
Activation of auto-adaptive dark
Enable/disable the auto-adaptive dark signal measuring
$ADKb or $ADK?
b = 1 or 0
6.6.17 Auto-adaptive Light Source Brightness
In this mode the controller adapts automatically the light source brightness to
compensate for variations in the level of the signal returned by the measuring object.
The LED brightness is modified so as to bring the signal level as close as possible to a
preset threshold.
Function
Format
Parameter/
Value returned
optoNCDT2401
Auto-adaptive LED
Enable/disable the auto-adaptive brightness measuring
$AALb or $AAL?
b = 1 or 0
47
Serial Interface
The threshold for this mode is set with the "VTH" command.
Function
Format
Parameter/
Value returned
Threshold for auto-adaptive mode
Set/request the threshold value for the auto-adaptive light source
test
$VTHn oder $VTH?
n = 0 ,,, 4095
6.6.18 First Signal Maximum
Relative maximum or “First peak” mode is a feature of the displacement measuring
mode that is useful for measuring objects whose surface is partially covered with a
transparent coating. For such measuring objects the reflection of the surface beneath
the coating may be stronger than that from the outer coating surface. In order that the
controller detects the first peak (instead of the strongest peak, which it does by
default), the “First peak” mode should be enabled.
Intensity
First peak mode
Function
Enable/Disable the relative maximum
Format
$MSPb or $MSP?
Parameter/
b = 0: Maximum
Value returned b = 1: Relative maximum (First maximum)
Highest
maximum
First
maximum
Detection threshold
Pixel CCD line
Fig. 6.3: First signal maximum
optoNCDT2401
48
Behavior of the controller in "Distance" measuring mode
Number of peaks Controller behavior when
above detection "First peak" mode is enabled
threshold
0
Distance = 0.0
Intensity = 0.0
1
2
More than 2
Controller behavior
when "First peak" mode
is disabled
Distance = 0.0
Intensity = 0.0
Distance and intensity corresponding to the Distance and intensity
single peak detected
corresponding to the
single peak detected
Distance and intensity corresponding to the Distance and intensity
first peak (peak generated by the surface corresponding to the
that is nearer to the sensor)
strongest peak
The controller uses the first maximum
Distance and intensity
above the detection threshold.
corresponding to the
strongest peak
Behavior of the controller in "Thickness" measuring mode
Number of peaks Controller behavior 1
above detection
threshold
0
Distance 1 = 0.0, Distance 2 = 0.0
Intensity 1 = 0.0, Intensity 2 = 0.0
1
2
More than 2
Distance 1 and intensity 1 correspond to the single peak detected.
Distance 2 and intensity 2 are, depending on parameter RSP, null or square with
distance 1 and intensity 1.
Distance 1 and intensity 1 correspond to the nearer peak.
Distance 2 and intensity 2 correspond to the further peak.
First, the sensor selects the two strongest peaks.
Distance 1 and intensity 1 correspond to the nearer peak among these 2 peaks
Distance 2 and intensity 2 correspond to the further peak among these 2 peaks
Detection level
Detection threshold is the minimum Intensity level for a peak to be detected. Smaller
peaks are considered as noise. Please note that the controller has 3 distinct detection
thresholds:
Detection threshold for
"Distance" measuring mode
"Thickness" measuring mode: 1 st peak
Command
MNPx
SPPx
"Thickness" measuring mode: 2 nd peak
SDPx
1) In the "Thickness" measuring mode the "first peak" mode has no effect.
optoNCDT2401
49
Serial Interface
6.6.19 Watchdog
The controller features a software to detect possible errors, i.e. a permanent test that
validates that the controller operates normally. In case it does not, the watchdog resets
the controller.
This feature is useful for the case the controller is blocked due to an incomplete
command or another reason.
Activate watchdog
Activate watchdog
Function
Enable/disable the watchdog function
Format
Parameter
$WDEb or $WDE?
b = 1 or 0
Watchdog period
Function
Format
Parameter
Watchdog period
Set/request the watchdog period
$WDPn or $WDP?
n = watchdog period in seconds
6.6.20 Save the Controller Configuration
The "Save setup" command is used to save the current configuration of the controller
on the non-volatile memory. If this is not done, the next time the controller is switched
off the controller will lose all the latest modifications made.
Save setup
Function
Save the current configuration in the controller EEPROM
Format
$SSU
Value returned None
IMPORTANT!
Use the "Save Setup"
command to avoid the
controller losing the
configuration when the
equipment is switched off.
6.6.21 Serial Number, Software Version
Version
Function
Request the firmware of the controller
Format
$VER
Value returned Serial number, software version
6.6.22 Reset Encoder Counter
Encoder reading is relative, so it is necessary to reset the counter each time they are
powered off and on. This can be done by sending the “Reset Encoder Counter”
command. The reading of the desired counter/s is set to the reset value.
Reset value = 2 30 / 2 = 536 870 912.
Format
Parameter
Example
Reset Encoder Counter
$RCDb1,b2,b3
bi = 1, if encoder should be reset
$RCD0,1,0
Set the reading of encoder 2 at current position to 536 870 912
Note: The reset value is intentionally not 0 because the counter data has to be a
positive integer.
optoNCDT2401
50
Serial Interface
6.6.23 Setting the Zero Values
A simplified method for configuring the analog outputs is available using the “Set Zero”
button on the front panel and/or the SOF command. This method may be used to set
the 0V-level of both analog outputs to the current value of the data directed to them
(the 10V values are kept at the max authorized values, cf. ANA command).
Function
Format
Parameter
Set analog output zero
Set/reset the analog output 0 V value
$SOFn
n = 0: set 0 V values to current values, equal to the "Zero" button
n = 1: reset 0 V values, cancels "Zero" button operation
Example
Query
$SOF1 (reset 0 V values)
Not available
6.6.24 Missing Signal in Thickness Measurement Mode
If in thickness measurement mode one signal is detected only, this may be due to:
- One surface of the measurement object is located outside of the measuring range or
- One signal is located below the detection threshold, see chapter 6.6.14 too.
The command "missing signal" assigns the behavior of the controller in such a case.
Option 1 (default setting)
Result
1. Surface
Displacement 1, Intensity 1 and Barycenter 1 of measured signal
2. Surface
Displacement 2 = Displacement 1, Intensity 2 = Intensity 1 and
Barcycenter 2 = Barycenter 1
Thickness = 0
Option 2
Result
1. Surface
Displacement 1, Intensity 1 and Barycenter 1 of measured signal
2. Surface
Displacement 2 = 0, Intensity 2 = 0 and Barycenter 2 = 0
Thickness = 0
Missing signal
Assigns the behaviour of controller in the thickness measurement
mode, if the sensor detects only one surface
Format
$RSPb oder $RSP?
Parameter/
b = 0: Option 2
Value Returned b = 1: Option 1
Funktion
optoNCDT2401
51
Serial Interface
6.6.25 Selection Light Source
The command selects between external and internal light source.
Funktion
Format
Parameter
Set light source
Selection of light source
$CCLn or $CCL?
n = 0: use the internal light source
n = 1: use the external light source
6.6.26 Switch on Double Frequency
With the operation modes
- Auto-adaptive Dark Signal,
- Auto-adaptive Light Source Brightness
the operation mode double frequency is not authorized. Only the query "$DFA? is
authorized.
Function
Format
Parameter/
Value
Returned
Activate "double frequency"
Enable/Disable the "double frequency" mode
$DFAb or $DFA?
b= 0: "double frequency" off
b = 1: "double frequency" on
6.6.27 Select Frequencies for Double Frequency
The DFF command sets or requests the two frequencies for the "double frequency" mode.
Function
Format
Parameter/
Value
Returned
"double frequency" frequencies
Set/Request the two frequencies for the "double frequency" mode
$DFFf1,f2 or $DFF?
f1= low frequency
f2 = high frequency in Hz
Conditions: frm x f1 < f2 x 1850 Hz, where frm is the minimum
authorized rate of the controller.
6.6.28 Transmitted Intensity in Double Frequency Mode
By default, the transmitted Intensity data is the “Normalized” one. This option may be
modified using the “DFI” command.
"double frequency" intensity
Function
Format
Parameter/
Value
Returned
optoNCDT2401
Select the type of transmitted intensity
$DFIb or $DFI?
b = 0: normalized intensity
b = 1: raw intensity
52
Serial Interface
6.7
Command List
Command Parameter
Basic settings
Description
AVS
Set/request of the spectral averaging
Set/request of the data averaging
Set/request the current measuring mode
Select the sensor type
Request the current measuring range used
Set/request the displacement threshold
Enable/disable the relative maximum
Set/request the threshold for strong signal peaks, thickness
measurement
Set/request the threshold for weak signal peaks, thickness
measurement
Set/request the measuring rate
Set/request the free measuring rate in Hz
Set/request the exposure time
Min. authorized measuring rate, query only
Get the current controller configuration
Hold last value
AVR
MOD
SEN
SCA
MNP
MSP
SPP
SDP
SRA
FRQ
TEX
FRM
STS
Averaging, range 1 … 999
Averaging, range 1 … 1000
Measuring mode, 0 or 1
Sensor-ID, range 1 … 19
Measuring range in μm
0.0 … 1.0
b = 1 or 0
0.0 … 1.1
0.0 … 1.2
1
Measuring rate ID
1
Measuring rate in Hz
1
Exposure time in μs
Minimum measuring rate in Hz
List of parameter values
Max. number of points to hold,
range 1…..999
HLV
0 or 1
MSP
0/1
RSP
Basic functions
DRK
None
FDKn,m
n = averaging, range 1 … 99
m = weighting, range 1 … 32767
Command Parameter
Basic functions
SSU
None
VER
None
RCD
b1, b2, b3 bi = 1: reset encoder counter i
Digital I/O
SOD
$SODn0,n1,n2,n3,n4,n5,n6,n7,n8,n9,n10,
n11,n12,n13,n14,n15 or $SOD?
ASC
None
BIN
None
BAU
9600 … 460800
CEE
Default setting = 2
CEB
Default setting = 32
CRB
Default setting = 520
Analog I/O
Enable/disable the relative maximum
"Missing signal" in thickness mode
Acquire and save dark signal
Acquire the dark signal for the current measuring rate only without
saving in the controller
Description
Saves the current controller settings in the EEPROM
Request serial number and software version of the controller
Reset encoder position
Set/request data to be transmitted, transmission channel
ASCII mode
Binary mode
Set/request the baud rate
Thickness measuring mode
Scale factor barycenter
Offset barycenter
ANA
n = Output-ID (0 or 1)
m = Data (0 … 7), see Chap. 6.4.1
p = Start value for Vmin (0 V)
q = End value for Vmax (10 V)
Configuration of the analog output
SOF
n = 0: set 0 V values to current values
n = 1: reset 0 V values
Set analog output zero
1) Parameter value is limited by the min. authorized measuring rate
optoNCDT2401
53
Serial Interface
Command Parameter
Description
Light source
SLP
b = 1 or 0
Enable/disable light source test
CSL
n = 0 ,,, 9999
Set/request the threshold for the light source test
LED
n = brightness, range 0 … 100
Set/request the light source brightness
CCL
n = 0: use the internal light source
n = 1: use the external light source
Selects the light source
Triggering
TRG
TRE
None
Put the controller on standby pending receipt of an external trigger
signal. Upon receipt of the trigger signal, the controller starts
measuring at the programmed measuring rate
n = number of points to latch on each "Sync Enable/Disable the “Latch” trigger and determine the number of
in" pulse, range: 1 … 99
points to latch
TRS
b = 1 or 0
Enable/Disable data output through flank control on the "Sync In"
input
TRN
b = 1 or 0
Enable/disable the data output through state control on the "Sync
In" input
None
Stops the trigger function and returns to normal operation mode
Edge characteristic for the commands TRG, TRE, TRS
State characteristic for the TRN command
CTN
TRF
b = 0 for rising edge and high state
b = 1 for falling edge and low state
Watchdog
WDE
b = 1 or 0
Enable/disable watchdog function
WDP
n = watchdog period in seconds
Set/request the time period for the monitoring function
Refractive index
SRI
x = refractive index, up to four decimal
places
INF
s = file name (up to 8 characters, limited
with "", without the ".ind" suffix
Auto-adaptive modes
AAL
b = 1 or 0
VTH
n = 0 ,,, 4095
Enable/disable the automatic brightness measuring
Set/request the threshold for the automatic light source test
ADK
b = 1 or 0
Enable/disable the automatic dark signal measuring
DFA
b = 1 or 0
f1 = low frequency
f2 = high frequency
b = 0 > normalized intensity
b = 1 > raw intensity
Enable/disable the double frequency mode
DFF
DFI
optoNCDT2401
Set/request the a constant refractive index for the measuring
object
Load a refractive index file
Set/request the frequencies for the double frequency mode
Selects the intensity to be transmitted
54
HyperTerminal
6.8
HyperTerminal
You can receive data and configure the controller through the RS232 interface with the
Windows HyperTerminal®. All you need is a free COM port (e.g. COM1) on your PC and
the commands described in the foregoing chapters.
Preparation Measuring
- Connect your controller to a free COM port of the host computer
- Start the program HyperTerminal® (Menu Start > Programs > Accessory >
Communication > HyperTerminal)
Type in the name of the connection
and click on the "OK" button.
Fig. 6.3: Connection establishment with the
program HyperTerminal®
Select the interface and click on
the "OK" button.
Land/Region: Germany(49)
Prefix:
8542
COM2
Fig. 6.4: Definition of the serial interface
Define the following interface parameters:
Baud rate: 115.200 Baud
Data format: 8 Data bits
Parity: None
Start / Stopbit: 1
Flow control: No
Click on the "OK" button.
10464,00051
10465,00049
$STS SRA1,MOD0,SEN00,SRC0,ASC,AVR99,SOD1
,32767,3,00000,04096,SCA 999
ready
10463,00050
10465,00049
_
Fig. 6.5 User interface in terminal operation
As soon as the connection is established, the data from the controller are sequentially
displayed. If the "$" character is sent, the data output is interrupted and the controller
waits for further instructions. Necessarily select a slower measuring rate and increase
the averaging rate in terminal use to reduce the data transfer rate.
optoNCDT2401
55
IFD2401 Tool
7.
IFD2401 Tool
The software
- transfers parameters to the controller and
- transmits measuring results and represent them in a diagram.
All data are transmitted through the USB interface and can be saved on demand.
7.1
Preparation for Measurements
System requirements
The following system requirements are recommended:
- Windows 2000 or Windows XP
- Pentium III, > 300 MHz
- 256 MB RAM
- USB 2.0 Port
IMPORTANT!
Cable and Program Routine Requirements
- USB cable
- Driver for USB port
- Software
7.2
The supplied CD contains
the driver for the USB port
and the software.
Installation
Proceed as follows to start using the demo software:
1. Switch on the controller.
2. Insert the supplied CD-ROM into the CD-ROM drive of the PC.
3. Connect the controller with a free USB 2.0 Port on your PC.
4. The Windows Assistant for searching for new hardware will start.
Select "Install the software
automatically (Recommended)" for
installation and click on "Next“.
Fig. 7.1: Windows XP has found a new
hardware and starts the hardware wizard.
You may see the screen during the
installation process as Windows XP
copies the files from the CD. No user
intervention is required.
Fig. 7.2: Windows XP copies files from CD
optoNCDT2401
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IFD2401 Tool
The USB Driver has now been installed.
Click the "Finish" button to finish the
installation.
Fig. 7.3: The operating system messages the
successful installation of the USB driver.
5. Start the file "IFD2401_Tool_Setup_Vx.x.exe" from the CD-ROM. This installs the
software on your PC.
6. Start the software. Menu Start > Programs > IFD2401_Tool_Vx.x.
Fig. 7.4: User interface in the displacement measuring mode
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IFD2401 Tool
7.3
Working with the IFD2401 Tool
7.3.1
Elements in the Main Window
1
2
Main window:
1 Menu bar:
Used to call up all the measuring programs and settings which are
available in the software.
2 Options display: Used to launch the individual configuring and measuring
programs.
7.3.2
Interface
Contains the substantial
interface settings and
makes it possible to read
the sensor calibration
tables stored in the
controller.
Examine before the start
of the measuring program the agreement
between sensor
respectively range
(measuring range) and
the connected sensor.
Otherwise a correct
measurement is not
possible.
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IFD2401 Tool
7.3.3
CCD
This program enables you
the direct readout of the
measurements from the
photo-sensitive element
(CCD) without previous
computation through the
controller.
The program differentiates
between three CCD
windows:
- Original CCD signal
including dark signal units.
- Original CCD signal less
of dark signal
- CCD signal spectrally
adjusted less off dark
signal.
7.3.4
Displacement Measuring
In the distance mode the
software evaluates the
data, which are currently
measured by the
optoNCDT2401. The main
view plots the distance
information. The program
also contains statistics and
a data storage. The
settings for the measuring
program are saved and
then reused when the
measuring program is
started again.
7.3.5
Thickness Measuring
In the thickness mode the
software plots the cur-rently
measured thickness data of
the optoNCDT 2401. Note
that the target refractive
index and the detection
thresholds (threshold) are a
basic condition for an
accurate measurement.
You will find further informations to the program in
the on-line help.
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59
Warranty
8.
Warranty
All components of the system have been checked and tested for perfect function in the
factory.
In the unlikely event that errors should occur despite our thorough quality control, this
should be reported immediately to MICRO-EPSILON.
The warranty period lasts 12 months following the day of shipment. Defective parts,
except wear parts, will be repaired or replaced free of charge within this period if you
return the device free of cost to MICRO-EPSILON.
This warranty does not apply to damage resulting from abuse of the equipment, from
forceful handling or installation of the devices or from repair or modifications performed
by third parties.
Repairs must be exclusively done by MICRO-EPSILON.
No other claims, except as warranted, are accepted. The terms of the purchasing
contract apply in full.
MICRO-EPSILON will specifically not be responsible for eventual consequential
damage.
MICRO-EPSILON always strives to supply it's customers with the finest and most
advanced equipment. Development and refinement is therefore performed
continuously and the right to design changes without prior notice is accordingly
reserved.
For translations in other languages, the data and statements in the German language
operation manual are to be taken as authoritative.
9.
Decommissioning, Disposal
- Disconnect the power supply and output cable on the controller.
- Disconnect the sensor cable between sensor and controller.
The optoNCDT240x is produced according to the directive 2002/95/EC („RoHS“). The
disposal is done according to the legal regulations (see directive 2002/96/EC).
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60
Troubleshooting
10.
Troubleshooting
Displacement measuring
If the “Measurement” LED on the controller front panel never turns on even though the
measuring object is within the measuring range of the sensor, check the following
points:
• The optical fiber cable connector is fully plugged into the socket on the front panel,
see Chap. 4.2.
• A light beam is emitted from the sensor and the spot is focused on the measuring
object.
• The distance between the extremity of the sensor and the surface of the measuring
object is equal to the start of measuring range and measuring range of the sensor,
see Chap. 4.4.1.
• The measuring object surface is normal to the optical axis. The local slope must be
less than the maximal slope angle of the sensor.
• The sampling rate selected is the lowest, see Chap. 5.7 and 6.6.2, the measuring
mode selected is “Displacement” mode, see Chap. 5.2 and 6.6.3.
• The dark signal has been correctly acquired, see Chap. 5.4.
• If your sensor’s light source is internal, check that the LED brightness is adjusted to
the maximum level, see Chap. 5.6.
Thickness measuring
If you manage to obtain a measurement in “Thickness” measuring mode but the
measured thickness is zero, check the following points:
• The thickness of the measuring object must be compatible with the measurement
range limit of the sensor, see Chap. 4.1.1.
• The measuring object must be sufficiently transparent.
• The measuring object must not vibrate during measurement.
• The optical axis must be normal to the surface of the measuring object.
• The measuring rate selected must be the lowest in the list.
• The two faces of the measuring object must be inside the measuring range,
see Fig.1
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Reset to Factory Setting
11.
Reset to Factory Setting
Resetting the sensor means recovering the factory default settings for all parameters. To
reset the controler proceed as following:
- Press simultaneously the 2 buttons “Dark” and “Zero” located on the controller
front panel for more than 3 seconds.
- Restart the sensor (switch off and on).
Files saved in the controller non volatile memory (calibration tables, dark signal,
refractive index files) are not affected by this operation, but current configuration is
irreversibly lost.
Fig. 11.1: The keys "Dark" and "Zero" on the controller
12.
Maintenance
Use isopropanol for cleaning the optics only. Ethyl alcohol or other cleaning solvents
cause streaks.
>> inaccurate, erroneous measurements
Avoid damage (scratches) to the optics through unsuitable cleaning methods or
cleaning solvents.
>> Inaccurate, erroneous measurements
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optoNCDT2401
63
MICRO-EPSILON
www.micro-epsilon.de
MICRO-EPSILON
MESSTECHNIK
GmbH & Co. KG
Königbacher Strasse 15
D-94496 Ortenburg
Tel. +49/85 42/1 68-0
Fax +49/85 42/1 68-90
e-mail: [email protected]
*X9751170-A11*
X9751170-A111040HDR