1.Brief Introduction
XMT-288FC-III Series Digital Display Thermometers are our specially designed
complete sets to winding transformers indicator. With connected with a BWR-04
Thermoregulator, the XMT-288FC-III can take remote measurement and control of the
winding temperature in a transformer. The series Thermometers include two kinds, one of
which can output (4~20)mA direct current signal (refer Figure 1).The other one owns
communication port RS485 which can link with a computer directly(refer Figure 2).
XMT - 288FC型 数显温度控制仪
.
上限
蓝山
°
上限设定调整
测量
M C 浙制01010249
上限
杭州华立仪表有限公司
Figure 1
Figure 2
2. Main Technical Parameters
1.Input signal：(4-20)mA
2.Measuring range：0~150℃
3. Accuracy: Grade 1.0
１
4.Display modes: 0.8〞×7nixie tube
5.Resolution ratio: 0.1℃
6. Setting range: Adjustable within the whole span
7. Contact output: Upper limit alarm
8. Contact capacity: 220VAC.3A (resistance)
9. Standard signal output :(4-20)mA DC
And special output signal which can be ordered:0~5VDC、1~5VDC、RS232、RS485.
11、Power supply：220VAC、50Hz
12、Power rating：6W
13、Working environment: Ambient temperature: 0~50℃ Ambient humidity:＜85%
14、Dimension of open pore: 152mm wide and 76mm high
3.Working elements
The working elements of XMT-288FC Series Digital Display Thermometers refer
Figure 3
(4-20)mA
Figure 3
4.Wiring
The XMT-288FC-Ⅲ install on either an operations area or an instrument screen with
two mounting racks and two screws which provided. After installing, it can be
connected .(Refer Figure 4 )
Figure 4
２
The connection of communication port RS485 refers Figure 5.
Figure 5
If the XMT-288FC-Ⅲ was been adjusted before using, power it on after check
the connection for 30 minutes, then make it work.
5.Adjusting
Every XMT-288FC-Ⅲ have been already adjusted before its delivery. The test
on XMT-288FC-Ⅲ can be conducted by connecting it either with a standard direct
current signal source or with a BWR—04 with its bulb inserted into a constant
temperature trough.
1. Basic facilities & condition for test:
·One direct current resistance box with grade 0.05
·One multimeter
·Power supply: 220VAC(±10%)
·Without corrosive gases around
2 Testing process
Connect wires according to Figure 6 especially for the XMT-288FC- Ⅲ
outputting 4~20mADC signal, a resistance of 250Ω should be connected between
the terminals of 8 and 9. So take the voltage drop of output current on the resistance
as output signal when testing. Power it on after check the connection 30 minutes later,
according to the meter’s measuring range, carry out the test.
Figure 6
３
Referring to Chart 1,check the upper limit alarm with “Ω”shift of a multimeter.
Chat 1
Lower than high
limit alerting value
⑤⑥off⑥⑦on
red: off
Higher than high
limit alerting value
⑤⑥on⑥⑦off
red: on
6. Maintenance and Troubleshooting
1. Repair
To keep the meter working in a long term with reliable condition, always take a
regular check (once a year on general) for the elementary errors、control function and
other main technical parameters.
2 .Troubleshooting
2.1 .of no display
2.2 of overflow or unstable display
Notice: If lead of the input port is broken, the value will shows:”-1”.
7. Points of Notice
1. Please read the instructions thoroughly before operate the XMT-288F(C).
2. Please connect wires strictly according to the terminal marks.
3. Please specify the model, thermal resistance, measuring range and range of standard
signal output when ordering. If not we will supply as output (4-20)mA.
4. The meter is guaranteed for a year since it turns out.
5. The meter still has other more potential functions could be developed, welcome to
order other special models.
４
8.MODBUS PROTOCOL
1. The serial transmission mode: RTU mode
In RTU mode, each 8-bit message byte contain two 4-bit hexadecimal
characters, each message must be transmitted in a continuous stream.
Baud
Slave Function Start Start Numder
Addr. Code
Addr. Addr. Of
(03H)
(Hi) (Lo) points
(Hi)
Number
Of
points
(Lo)
CRC CRC
(Lo) (Hi)
rate:
9600bps
2.MODBUS message Format
The MODBUS protocol defines the format for the master’s query and the slave’s
response, only the master can initiate a query.
The query contains the device address, a function (only 03H) defining the
requested action, any data to be sent, and an error-checking field.
The response contains fields confirming the action taken, any data to be returned,
and an error-checking field. If an error occurred in receipt of the message, or if the
slaver is unable to perform the requested action, the slaver will construct an error
message and send it as its response.
Query
The example illustrates a request for a single 16-bit Modbus Register
RTU Mode Byte Format
Coding
system
Bits
per
byte
Error check
field
8-bit binary hexadecimal 0-9,A-F, two hexadecimal
characters in each 8-bit field of the message
1 start bit+8 data bits,lsb sent first+1 stop bit with no
parity
Cyclical redundancy check (CRC)
Slave Address: 8-bit value representing the slave being addressed a (0 to 31)
Function code: 8-bit value telling the addressed slave what action is to be performed.
(Only 03H)
Start Address (Hi): the top (most significant) eight bits of a 16-bit number specifying
the start address of the data being requested
Start Address (Lo): the bottom (least significant) eight bits of a 16-bit number
specifying the start address of the data being requested
Number of points (Hi): The top (most significant) eight bits of a 16-bit number
specifying the number of registers being requested.
Number of points (Lo): The bottom (least significant) eight bits of a 16-bit number
specifying the number of registers being requested
CRC(Lo):The bottom(least significant)eight bits of a 16-bit number representing the
error check value
CRC(Hi):The top(most significant)eight bits of a 16-bit number representing the error
check value
５
-1
Response
The example illustrates the normal response to a request for a single 16-bit register.
Slave Function Byte Data Data CRC CRC
Addr. Code
Count (Hi) (Lo) (Lo) (Hi)
(03H)
(02H)
Slave Address: 8-bit value representing the address of slave, which has just responded
Function code: Only 03H, a copy of the function code in the query, indicates that the
slave recognized the query and has responded
Byte conut8-bit value indicating the number of data bytes contained within this
response (02H)
Data (Hi): The top (most significant) eight bits of a 16-bit number representing the
register requested in the query
The most-significant bit set to logic ‘1’,it means that the temperature is below 0℃.For
example,8064H= -10.0℃; 0064H=10.0℃
Data (Lo): The bottom (least significant) eight bits of a 16-bit number representing
the register requested in the query.
A 16 bit signed integer value with resolution of 0.1℃/lsb.For example, a value of 253 is
equivalent to 25.3℃
CRC (Lo): The bottom (least significant) eight bits of a 16-bit number representing
the error check value
CRC (Hi):: The top (most significant)eight bits of a 16-bit number representing the
error check value
Exception response
If an error is detected in the content of the query, the function code will be modified
to indicate that the response, and the data byte will contain a code that describes the error.
The exception response is identified by the function code being a copy of the query
function code.
Slave
address
Function
Code
(03H)
Error
Code
(02H)
CRC
(Lo)
６
CRC
(Hi)
XMT-288FC-Ⅲ Series
Digital Display Thermometer
(For BWR—04)
Operation
Instructions
Hangzhou HuaLi Instrument & Meter Co.,Ltd
Address:27 Longwu Industrial Zone,Hangzhou Post code:310024
Tel : 0571-87088120
E-mail: lanshan＠mail.hz.zj.cn
Fax: 0571-87919920
Http://www.hz-hlyb.com
７
Tha nks for using o ur product
Before o pera ting it, please rea d this ma nua l thoro ug hly
Contents
1.Brief Introduction
……………………………………………………………………………
2. Main Technical Parameters
3.Working elements
(1)
………………………………………………………………(1)
………………………………………………………………………………(2)
4.Wiring…………………………………………………………………………………………………(2)
5.Adjusting
…………………………………………………………………………………………
6. Maintenance and Troubleshooting
7. Points of Notice
……………………………………………………
(3)
(4)
…………………………………………………………………………………(4)
8.MODBUS PROTOCOL
………………………………………………………………………(5)
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