RS485 External Module for Data Logger Meteo-40
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M83550
Biasing resistors for RS485 bus (680Ω) (configurable with jumpers)
RS485 bus termination (120Ω) (switchable with jumper)
Overvoltage protection for all RS485 bus lines
A stabilised and actively fused 5V / 110mA output for general purposes
Protected with fuse T0.8A (time-lag)
Housing dimensions (width x height x depth): 22.5 x 110 x 115mm
Operating temperature: -40°C ... +75°C
Pin Assignment
1 2 3 4
9 10 11 12
1: TxD −
110mm
5 6 7 8
9:
RxD −
10: TxD +
2: TxD +
13 14 15 16
3: RxD +
11: RxD +
4: RxD −
12: TxD −
5: 5V Out
13: A −
6: GND
14: Supply
7: B +
15: B +
8: A −
16: GND
Earth contact
22.5mm
Metall foot catch
Electrical Characteristics
Parameter
Supply voltage
Quiescent current
Min
Type
9V
24V
7.5mA
18mA
T0.8A (time-lag)
(5 x 20mm)
Fuse
Output voltage
Max
4.9V
5.0V
Output current (ϑ = 25°C)
5.2V
110mA
Bus termination
120Ω
Biasing resistors
680Ω
page 1/5
Ammonit
Measurement GmbH
Wrangelstrasse 100, D-10997 Berlin, Germany
T: +49 30 6003188-0, E: [email protected]
measuring wind power
www.ammonit.com
RS485 External Module for Data Logger Meteo-40
M83550
Principle of operation
RS485-M (Master)
•• Half duplex interface
Supply
The intention of the M83550 is to provide a universal
interface to different types of RS485-sensors of different manufacturers. In order to have this flexibility,
biasing resistors (680Ω) for the B+ line and the A- line
are needed. The figure on the right side shows the half
duplex interface for RS485 with M83550 working on the
lines B+ and A-.
14
Internal 5V
Meteo−40
JP1
Jumper: Pull−Up
RS485
Sensor
680 Ohm
15
7
B+
TXD+/RXD+
JP2
Jumper: Termination
120 Ohm
To have active biasing resistors, jumpers JP1 and JP3
are set by default.
RS485 M
Master
120 Ohm
8
13
TXD−/RXD−
A−
JP3
Jumper: Pull−Down
if available
Additionally a termination resistor of 120Ω may be set
via jumper JP2. In conjunction with Meteo-40 it is not
needed. Therefore, M83550 is shipped with an open
jumper JP2.
680 Ohm
M83550
6 / 16
Up to 8 sensors can be connected.
Supply
14
Internal 5V
Sensor 8
Sensor 2
Sensor 1
Meteo−40
JP1
Jumper: Pull−Up
680 Ohm
TXD+/RXD+
15
7
JP2
Termination
B+
Jumper: Termination
RS485 M
120 Ohm
120 Ohm
Resistor
Master
120 Ohm
TXD−/RXD−
13
8
A−
JP3
Jumper: Pull−Down
680 Ohm
M83550
6 / 16
page 2/5
Ammonit
Measurement GmbH
Wrangelstrasse 100, D-10997 Berlin, Germany
T: +49 30 6003188-0, E: [email protected]
measuring wind power
www.ammonit.com
RS485 External Module for Data Logger Meteo-40
RS485-S (Slave)
•• Full duplex interface
•• SCADA
M83550
Supply
14
The figure on this page shows the setup of a
SCADA system. The Meteo-40 data logger is
connected to the SCADA client via the full duplex interface (Slave).
Internal 5V
SCADA
JP7
Meteo−40
Jumper: Pull−Up
Client
If biasing on the full duplex (Slave) interface
is needed, the jumpers JP4, JP6, JP7 and JP9
have to be set additionally.
680 Ohm
2
10
TxD+
JP8
Up to eight sensors can be connected to the
half duplex interface (Master) of the Meteo-40.
Jumper: Termination
120 Ohm
1
12
TxD−
JP9
Jumper: Pull−Down
680 Ohm
RS485 S
Master
Slave
JP4
Jumper: Pull−Up
680 Ohm
3
11
RxD+
JP5
Jumper: Termination
120 Ohm
4
9
RxD−
JP6
Jumper: Pull−Down
680 Ohm
Internal 5V
RS485
Sensor 8
RS485
Sensor 2
JP1
RS485
Sensor 1
Jumper: Pull−Up
680 Ohm
15
7
JP2
Termination
B+
Jumper: Termination
120 Ohm
120 Ohm
Resistor
RS485 M
Master
120 Ohm
13
8
A−
JP3
Jumper: Pull−Down
680 Ohm
M83550
6/16
page 3/5
Ammonit
Measurement GmbH
Wrangelstrasse 100, D-10997 Berlin, Germany
T: +49 30 6003188-0, E: [email protected]
measuring wind power
www.ammonit.com
RS485 External Module for Data Logger Meteo-40
RS485-S (Slave)
•• Half Duplex SCADA client
M83550
SCADA
Meteo−40
Converter
Client
The figure on this page shows a SCADA setup
using a half duplex interface at the SCADA
client.
In order to connect the SCADA client to
the Meteo-40 slave interface, an additional
converter (e.g. Comm-Front RPT-485-422-2)
has to be applied.
B+
RX+
TxD+
RX−
TxD−
RX+
The converter can be supplied by the 5V output of the M83550 module (Pin 5).
The master interface has the same setup as
shown on page 3.
RS485 S
Master
Slave
A−
TX+
5VDC
TX+
RxD+
TX−
RxD−
GND
Supply
5
14
5V Out
Internal 5V
RS485
Sensor 8
RS485
Sensor 2
JP1
RS485
Sensor 1
Jumper: Pull−Up
680 Ohm
15
7
JP2
Termination
B+
Jumper: Termination
120 Ohm
120 Ohm
Resistor
RS485 M
Master
120 Ohm
13
8
A−
JP3
Jumper: Pull−Down
680 Ohm
M83550
6/16
page 4/5
Ammonit
Measurement GmbH
Wrangelstrasse 100, D-10997 Berlin, Germany
T: +49 30 6003188-0, E: [email protected]
measuring wind power
www.ammonit.com
RS485 External Module for Data Logger Meteo-40
M83550
Jumper settings
Jumper Description
RS485-M (Master)
RS485-S (Slave)
JP1
Pull-up B+
on
JP2
Termination B+/A-
off
JP3
Pull-down A-
on
JP4
Pull-up RxD +
off
JP5
Termination RxD
off
JP6
Pull-down RxD -
off
JP7
Pull-up TxD +
off
JP8
Termination TxD
off
JP9
Pull-down TxD -
off
JP4
JP5
JP6
JP7
JP8
JP9
JP1
JP2
JP3
Fuse
page 5/5
Ammonit
Measurement GmbH
Wrangelstrasse 100, D-10997 Berlin, Germany
T: +49 30 6003188-0, E: [email protected]
Last Modification: 09 August 2012
measuring wind power
www.ammonit.com