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Example of response message
The slave returns a response message (result) informing that “Host maintenance mode ON
command” (one word of data) has been written, to the master.
Host maintenance mode ON command (with self-resetting) = ON (0x0011)
Message frame
Modbus TCP
Modbus RTU
Remarks
Data item
Data
size
(byte)
No.
Byte
data
Hex
No.
Byte
data
Hex
TRXN ID
Hi
2
(1)
0
0x00
–
–
–
Modbus TCP
only
Lo
(2)
0
0x00
–
–
–
Protocol
ID
Hi
2
(3)
0
0x00
–
–
–
Modbus TCP
only
Fixed at “00”.
Lo
(4)
0
0x00
–
–
–
Quantity
of comm.
data
Hi
2
(5)
13
0x00
–
–
–
Modbus TCP
only
Number of data
which follows
unit ID
Lo
(6)
0x0D
–
–
–
Unit ID
1
(7)
3
0x03
(1)
3
0x03
Function code
1
(8)
6
0x06
(2)
6
0x06
Starting
address
Hi
2
(9)
49
0x00
(3)
49
0x00
Lo
(10)
0x31
(4)
0x31
Data
Hi
2
(11)
17
0x00
(5)
17
0x00
Write by the
word.
Lo
(12)
0x11
(6)
0x11
Error
check
data
Lo
2
–
–
–
(7)
0x19
Modbus RTU
only
Hi
–
–
–
(8)
0xEB
Common to both Modbus TCP and Modbus RTU.
