Delta Electronics DVP15MC11T, Operation Manual

Page: 558 / 601

Appendix B Modbus TCP Communication
B_
Byte NO. Name Byte
Byte5 Low byte
Byte6 Modbus ID Single byte
Byte7
0x80+ function code Single byte
Byte8
Exception response code Single byte

Example
To read the state value of %QX2.0~%QX3.4 in DVP15MC11T via function code 02. 0xA010 is
the address of %QX2.0. Suppose that %QX2.0~%QX2.7=1000 0001
and %QX3.0~%QX3.4=10001.
Request message: 00 00 00 00 00 06 01 02 A0 10 00 0D
Response message: 00 00 00 00 00 06 01 02 02 81 11

Function code: 0x05 to write one single bit register value

Request message data structure:
Byte NO. Name Byte
Byte0
Transaction identifier
High byte
Byte1
Low byte
Byte2
Protocol identifier
High byte
Byte3
Low byte
Byte4
Modbus data length
High byte
Byte5
Low byte
Byte6
Modbus ID Single byte
Byte7
Function code Single byte
Byte8
Modbus address of a bit register
High byte
Byte9 Low byte
Byte10
The value written in the bit register
High byte
Byte11 Low byte

Response message data structure:
Byte NO. Name Byte
Byte0
Transaction identifier
High byte
Byte1 Low byte
Byte2
Protocol identifier High byte
B-9