Message Format - SMC Networks HECR Series Communications Manual

MODBUS communication function
5.5 Message configuration

5.5.1 Message format

The message configuration is shown below. This product communicates in ASCII mode. ASCII
mode is used from Start to End.
1)
Start Slave Address
[:] XX
1) Start
2) Slave Address (=Unit number) (01H to 0FH 3031 to 3046)
3) Function (Refer to ''5.6 Function codes''.)
4) Data
5) LRC
6) END
5-5
2) 3)
Function
XX XX
The start of the message. [:] (3AH)
This is a number to identify this product. "1" is the default setting. This can be changed by
the operation display panel.
Command is assigned.
Depending on the function, the address and the number of the register, the value of
reading/writing are assigned.
LRC method
Refer to ''5.7 LRC''.
The end of the message. [CR] (0DH) + [LF] (0AH)
A response message will not be returned unless the request includes [:] and [CR] [LF].
This product clears all previously received code when [:] is received.
4)
Data
～
XX XX
5)
LRC
XX XX XX
6)
End
[CR] [LF]
HECR