Omron CJ1W-SCU32 Operation Manual page 227

Response Frame
Frame before Conversion
Start (silent
interval of
3.5
characters)
(See note.)
Frame after Conversion
Remote Remote
network node
address address
(DNA) (DA1)
Serial port 00 hex
allocated
address
or local or local
network network
address node
address
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Modbus-RTU frame
Slave FUNCTION Communications data
address code (n bytes)
(1 byte) (1 byte)
Header Command
Remote Etc. MRC SRC
unit
address
(DA2)
Serial 28 04
port
unit
address
Error End (silent
interval of
check
3.5
CRC
characters)
(1 byte)
(See note.)
Command
end code
MRES SRES
Modbus-RTU
(command section only)
User- User- Slave
speci- speci- address
fied fied (1 byte)
5 Serial Gateway
FUNCTION Communica-
code (1 byte) tions data
(n bytes)
5
5-35