B.1 Modbus Tcp Message Structure - Delta Electronics DVP15MC11T Operation Manual

DVP15MC11T Operation Manual
B.1 Modbus TCP Message Structure

Modbus TCP message structure
Byte NO.
Byte0
Byte1
Byte2
Byte3
Byte4
Byte5
Byte6
Byte7
Byte8
B
Byte9
Byte10
B.2 Modbus Function Codes Supported in Modbus TCP

Modbus function codes which DVP15MC11T supports
Function
code
0x02
0x03
0x05
0x06
0x0F
0x10
B-2
Transaction identifier
Protocol identifier
Modbus data length
Modbus ID
Function code
Register address in
DVP15MC11T
Modbus data
Function
Read bit register value; maximum 256 bits of data could
be read at a time.
Read one single or multiple word register values;
maximum 100 words of data could be read at a time.
Write one single bit register value.
Write one single word register value.
Write multiple bit register values; maximum 256 bits of
data could be written at a time.
Write multiple word register values; maximum 100 words
of data could be written at a time.
Name
High byte
Low byte
High byte
Low byte
High byte
Low byte
Single byte
Single byte
High byte
Low byte
High byte
Explanation
0
0
The number of bytes of
Modbus address and the
data after it.
0～0xFF
0~0xFFFF
The number of bytes of
Modbus data is
determined by function
code.
Register
%IX and %QX
%IW, %QW and %MW
% QX
%QW and %MW
% QX
%QW and %MW