Digital tube display modbus rtu RS485 control analog output DA module 4-20ma0-5V0-10v|ic0A1426|Electronic products

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Condition:New
Type:Logic ICs

Host computer modbus rtu RS485 control analog output DA module 4-20ma/0-5V/0-10v

Communication description
Module register address
Register address: 0
Use function code: 03/06
Data type: 16BIT integer (signed)
Communication format: 9600, 8, N, 1
Communication protocol: MODBUS RTU

Instruction analysis
Read module analog value
Command frame sent to the module: 03 03 00 00 00 01 85 E8
among them
The first 03 is the module communication address
The second 03 is the function code to read the analog value
00 00 is the register address
00 01 is the number of words (two bytes) to read the register
85 E8 is CRC check, low order first.
Module returns: 03 03 02 00 50 C1 B8
among them
The first 03 is the module communication address
The second 03 is the function code to read the analog value
02 is the number of bytes of returned data
00 50 is the returned data, that is, the analog value, the high digit is first, and the decimal system is 80, which means 0.08V, 0.08MA or other engineering units (the specific multiple depends on the model)
C1B8 is CRC inspection

Control module output analog
Control the output value of a single channel:
Send command: 03 06 00 00 00 56 08 16
Where 03 is the module address;
06 is the function code to write to the holding register;
00 00 is the register address of the written channel;
00 56 is the value to be written, 0056 represents the output voltage
0.086V. Set the voltage and current value to be output as VO, you need to write
Numerical formula
Value written = VO*1000
08 16 is CRC check code, low order first
Module return: 03 06 00 00 00 56 08 16
The data returned by the module and the written data are the same, indicating that the module was successfully written, and if they are different, it means that the writing failed.