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13. MODBUS communication ■
■ Data structure
This product support MODBUS RTU protocol, Function 03H、06H code, the data protocol
of all function codes as below.
Function 03H: Read holding registers
Read 2 data from register in an inverter at slave address =1FH, data address are continuous
and the beginning address is 280H，the RTU MODE data frame are listed as below:
RTU
Mode:
Query
Response
Field name
Example
Field name
Example
Slave address
1FH
Slave address
1FH
Function
03H
Function
03H
Starting address
(high byte)
02H
Byte
count
04H
Starting address
(low byte)
80H
Content of address
006BH (high byte)
03H
Number of register
(high byte)
00H
Content of address
006BH (low byte)
E8H
Number of register
(low byte)
02H
Content of address
006CH (high byte)
00H
CRC error check
(low byte)
C7H
Content of address
006CH (low byte)
00H
CRC error check
(high byte)
E5H
CRC error check
(low byte)
84H
CRC error check
(high byte)
42H
