Chapter 4 Communication Protocol
4.1 Basic communication parameters
parameter content
Data bit
8-bit
Parity bit no
Stop bit 1
-bit
Wrong calibration
CRC lengthy cyclic code
Baud rate
2400bps/4800bps/9600bps can be set ,the factory
default is 9600bps
4.1 Data frame format definition
Adopt Modbus-RTU communication protocol, the format is as follows:
Initial structure ≥ 4 bytes of time
Address code = 1 byte Function code = 1 byte Data area = N bytes
Error check = 16-bit CRC code end structure ≥ 4 bytes time
Address code: It is the function indicator of the transmitter, this
transmitter only uses the function code
0x03 (read register data).
Data area: The data area is the specific address, which is unique in
the communication network
(The factory default is 0x01).
Function code: command communication data sent by the host, pay
attention to the 16bits data high byte first!
CRC code: two-byte check code.
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