User manual

Appendix B
DVP-MC operating manual B-9
Function code: 0x02 to read bit-device register value
Request message data structure:
Data order Name Byte
Byte0 High byte
Byte1
Transaction identifier
Low byte
Byte2 High byte
Byte3
Protocol identifier
Low byte
Byte4 High byte
Byte5
Modbus data length
Low byte
Byte6 Modbus ID Single byte
Byte7 Function code Single byte
Byte8 High byte
Byte9
The start address of the read bit device in DVP10MC11T
Low byte
Byte10 High byte
Byte11
The number of the read bit device in DVP10MC11T
Low byte
Response message data structure:
Data order Name Byte
Byte0 High byte
Byte1
Transaction identifier
Low byte
Byte2 High byte
Byte3
Protocol identifier
Low byte
Byte4 High byte
Byte5
Modbus data length
Low byte
Byte6 Modbus ID Single byte
Byte7 Function code Single byte
Byte8 The Byte number of the read bit device Single byte
Byte9 The status value of the bit device which has been read Single byte
… The status value of the bit device which has been read Single byte
Byte n The status value of the bit device which has been read Single byte