[SM1202B-8]  RS485 interface 8-channel PT1000 acquisition module

SM1202B-8 SM1202B-8

Technical Parameters

Technical parameterParameter value
BrandSONBEST
Temperature measurement range-50℃ to +100℃ (optional with other ranges)
Detecting Core DevicesPT1000
Temperature Measurement Accuracy± 0.3℃ (optional ±0.3℃
±0.15℃) Thermal Response Coefficient
10mΩ/KThe resistance of the sensor at 0 ℃
1000Ω±0.12Ω/KThe resistance of the sensor at 0-100 ℃
3.85Ω/KReference Execution Standards
Using EN 60751 Class B StandardsChannels
8Wire
2-wire or 3-wireCommunication Interface
RS485Default baud rate
9600 8 n 1Power
DC9~24V 1ARunning temperature
-30~85℃Working humidity
5%RH~90%RH

Product Size

SM1202B-8

Wiring instructions

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Communication Protocol

    The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands are hexadecimal data. The default device address is 1 when the device leaves the factory, and the module or NON-Recorder default baud rate is 9600,8,n,1 ,but data recorder default baud rate is 115200 .
1. Read data (function code 0x03)
    Inquiry frame (hexadecimal), sending example: query 1 data of 1# device, the upper computer sends the command: 01 03 00 00 00 08 44 0C .
Address Function Code Start Address Data Length Check Code
010300 0000 0844 0C
    For the correct query frame, the device will respond with data: 01 03 10 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64 39 , response format:
Address Function Code LengthData 1Data 2Data 3Data 4Data 5Data 6Data 7Data 8Check Code
0103 1000 7900 7A00 7B00 7C00 7D00 7E00 7F00 80 64 39
    Data description: The data in the command is hexadecimal, take data 1 as an example, 00 79 is converted to decimal value as 121, assuming the data magnification is 100, then the real value is 121/100=1.21, Others and so on.
2. Common data address table
Configuration Address Register Address Register Description Data Type Value Range
4000100 00temperatureRead Only0~65535
4000200 01temperatureRead Only0~65535
4000300 02temperatureRead Only0~65535
4000400 03temperatureRead Only0~65535
4000500 04temperatureRead Only0~65535
4000600 05temperatureRead Only0~65535
4000700 06temperatureRead Only0~65535
4000800 07temperatureRead Only0~65535
4010100 64Model CodeRead/Write0~65535
4010200 65 total number of measuring points read/write 1~20
4010300 66device addressread/write1~249
4010400 67baud rateread/write0~6
4010500 68communication moderead/write1~4
4010600 69protocol typeread/write1~10


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