bit bit bit
(1-8-1 format, odd parity)
Start
bit
1 2 3 4 5 6 7 Odd
parity
Stop
bit
(1-8-1 format, even parity)
Start
bit
1 2 3 4 5 6 7 Even
parity
Stop
bit
Communications data structures
RTU mode：
START Maintaining no input signal for more than
or equal to 10ms
Address address：8-bit Binary address
Function Function code：8-bit Binary address
DATA（n - 1） Data content：
N*8-bit data，N<=8，less than 8 bytes
……………
DATA 0
CRC CHK Low CRC Check code
CRC CHK High 16-bit CRC check code is combined with 2
8-bit Binary code
END Maintaining no input signal for more than
or equal to 10ms
The most important function of Modbus is to read and write parameters. Different function
codes determine different operation requests. Inverter Modbus protocol supports the
following function code operation:
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