B.3 Exception Response Code In Modbus Tcp - Delta Electronics DVP15MC11T Operation Manual

B.3 Exception Response Code in Modbus TCP

Modbus exception response codes that DVP15MC11T supports are shown in the table below.
Exception response code
0x01
0x02
0x03
B.4 Modbus Function Codes in Modbus TCP

Function code: 03 to read one single or multiple word register values

Request message data structure:
Byte NO.
Byte0
Byte1
Byte2
Byte3
Byte4
Byte5
Byte6
Byte7
Byte8
Byte9
Byte10
Byte11

Response message data structure:
Byte NO.
Byte0
Byte1
Byte2
Byte3
Byte4
Byte5
Byte6
Byte7
Appendix B Modbus TCP Communication
Indication
Unsupportive function code
Unsupportive Modbus address
Data length exceeds the range
Name
Transaction identifier
Protocol identifier
Modbus data length
Modbus ID
Function code
The start address of word registers to be
read
The number of word registers
(Counted by Word)
Name
Transaction identifier
Protocol identifier
Modbus data length
Modbus ID
Function code
Byte
High byte
Low byte
B_
High byte
Low byte
High byte
Low byte
Low byte
Single byte
High byte
Low byte
High byte
Low byte
Byte
High byte
Low byte
High byte
Low byte
High byte
Low byte
Single byte
Single byte
B-3