SMC Networks HECR Series Communications Manual page 31

MODBUS communication function
5.8.2 Function code：06H Writing registers
Write data to assigned address.
◼
Request message <Normal> (Master to Slave)
Start Slave Address
[:]
XX XX
◼
Response message <Normal> (Slave to Master)
Start Slave Address
[:]
XX XX
◼
Communication example
1) Slave Address (=Unit number): No 1
2) Write data to register 0050H
(Commands to run)
Your system
(Request):010600500001A8 [CR][LF]
(Response):010600500001A8 [CR][LF]
Request message
Code
01 Slave Address
06 Function
0050 Address of specified register
0001 Information written to 0050H (Stop flag)
A8 LRC
5-9
Function
[0] [6]
Write Address
Hi Lo
XX XX XX
Function
[0] [6]
Write Address
Hi Lo
XX XX XX
Contents
Data
Write Data
Hi
XX XX XX
Data
Write Data
Hi
XX XX XX
Response message
Code
01 Slave Address
06 Function
0050 Address of register to write
0001 Information of register to write
A8 LRC
LRC End
XX XX [CR]
Lo
XX XX
LRC End
XX XX [CR]
Lo
XX XX
This product
Data is sent and
received in ASCII
code.
Contents
[LF]
[LF]
HECR