Omron CS1W-SCU21 Operation Manual page 139

1XGTXKGY QH VJG 2TQVQEQN /CETQ (WPEVKQPU
 2TQVQEQN 5VTWEVWTG
Serial
Communications Unit
(CS/CJ Series)
Serial Communications Board
(CS Series only)

+P VJKU OCPWCN VJG RTQVQEQN UVTWEVWTG KU GZRNCKPGF KP UKORNG VGTOU CPF GZCO
RNGU CTG IKXGP QH VJG WUG QH VJG 2/%4  KPUVTWEVKQP YJGP EQPVTQNNKPI
1/410 FGXKEGU WUKPI UVCPFCTF U[UVGO RTQVQEQNU (QT FGVCKNU QP VJG RTQVQ
EQNU VJG OGVJQF QH OQFKH[KPI VJG UVCPFCTF U[UVGO RTQVQEQNU CPF VJG OGVJQF
QH ETGCVKPI PGY UGSWGPEGU TGHGT VQ VJG %:2TQVQEQN 1RGTCVKQP /CPWCN
9 
2TQVQEQNU EQPUKUV QH UGPFTGEGKXG UGSWGPEGU # UGSWGPEG EQPUKUVU QH UVGRU
6JGUG UVGRU ECP DG TGRGCVGF QT VJG[ ECP DG DTCPEJGF QT GPFGF FGRGPFKPI
QP VJG TGURQPUGU TGEGKXGF # UVGR EQPUKUVU QH C EQOOCPF UGPFTGEGKXG OGU
UCIGU RTQEGUUKPI TGUWNVU CPF VJG PGZV RTQEGUU YJKEJ FGRGPFU QP VJG RTQ
EGUUKPI TGUWNVU 
Protocol
Send/receive
sequence
Step 0
Step 1
Messages
# RTQVQEQN EQPUKUVU QH RTQEGUUKPI UGSWGPEGU UWEJ CU TGCFKPI VJG RTQEGUU
XCNWG HQT C 6GORGTCVWTG %QPVTQNNGT HQT C IGPGTCNRWTRQUG GZVGTPCN FGXKEG #
UGSWGPEG EQPUKUVU QH C ITQWR QH UVGRU GCEJ QH YJKEJ EQPUKUVU QH C UGPF
TGEGKXGEQPVTQN EQOOCPF UGPFTGEGKXG OGUUCIG RTQEGUUKPI TGUWNV CPF C
PGZV UVGR VJCV FGRGPFU QP VJG RTQEGUUKPI TGUWNVU
(QT GZCORNG YKVJ C UGSWGPEG VJCV TGCFU VJG RTQEGUU XCNWG HQT C 6GORGTCVWTG
%QPVTQNNGT VJG UGSWGPEG UGPFU VJG UGPF OGUUCIG HQT VJG EQPPGEVGF 6GORGT
CVWTG %QPVTQNNGT C EJCTCEVGT UVTKPI KP YJKEJ VJG 2TQEGUU 8CNWG 4GCF EQO
OCPF KU KPUGTVGF DGVYGGP VJG JGCFGT CFFTGUU CPF VJG EJGEM EQFG
VGTOKPCVQT CPF TGEGKXGU VJG TGEGKXG OGUUCIG C EJCTCEVGT UVTKPI KP YJKEJ VJG
2TQEGUU 8CNWG 4GCF EQOOCPF TGURQPUG KU KPUGTVGF DGVYGGP VJG JGCFGT
CFFTGUU CPF VJG EJGEM EQFG VGTOKPCVQT 
Command
CPU Unit
SEND
(send)
RECV
(receive)
Example: Reading the process values
for a Temperature Controller
Transmission of process value reading message and
reception of response message
Send message (Example: PROCESS VALUE READ command)
...
RX00
Header Address Send data Check Terminator
code
Receive message (Example: Response)
...
RX01
Header Address Send data Check Terminator
code
General-purpose external device
5GEVKQP 
RS-232C or
RS-422A/485