Nor-Cal SDC15 Controller - Manual (Page 184)

● Response Message
A response message corresponding to the command content is returned when the
message is correctly received.
The figure below shows the structure of the response message when the data is
written.
MODBUS ASCII
(1) Start of message
(2) Station address
(3) Write command 10H
(4) Write start word address 1
(5) Write data count
(6) Checksum
(7) CR
(8) LF
MODBUS RTU
(1) Station address
(2) Write command 10H
(3) Write start word address
(4) Write data count
(5) Checksum
Note
The response message at the time of abnormal termination is the same as that for
the read command.
8-10
Chapter 8. MODBUS COMMUNICATIONS FUNCTIONS
(2) (1) (3) (4) (5) (6) (7) (8)
3AH
:
30H
0
31H
1
31H
1
30H
0
30H
0
35H
5
44H
D
44H
D
30H
0
30H
0
30H
0
32H
2
30H
0
42H
B
0DH
CR
0AH
LF
(2) (1) (3) (4)
01H 10H 05H DDH 00H 02H D1H
(5)
3EH