Omron CJ1W-SCU32 Operation Manual page 373

RS-422 4-wire Connections
• RS-422 connections can be one-to-one, or one-to-N when a 3G2A9-AL001 Link Adapter is
used. A maximum of 32 Serial Communications Boards and Unit can be connected in one-to-
N systems.
• The total cable length can be 500 m max.
• Use shielded, twisted-pair cable.
• Be sure to turn ON the terminating resistance switches only at the device at each end of the
transmission line.
CJ1W-SCU@1-V1
Set the 2-/4-wire switch
to the 4-wire setting.
Turn ON the terminat-
ing resistance switch.
CJ1W-SCU@2
RS-485 2-wire Connections
• RS-485 connections can be one-to-one or one-to-N. A maximum of 32 Serial Communica-
tions Units/Boards can be connected in one-to-N systems.
• The total cable length can be 500 m max.
• Use shielded, twisted-pair cable.
• Be sure to turn ON the terminating resistance switches only at the device at each end of the
transmission line.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Serial Commu-
nications Board/Unit
Intelligent Signal
Processor
RS-422
Abbreviation
Ab-
Pin
brevi-
No.
Shell
ation
6
8
1
2
Shielded wire
The terminating resistance (220 Ω) is set with the terminal block switch.
Serial Communications Board/Unit
Intelligent Signal Processor
RS-422
RS-422
Pin
Abbreviation
No.
RDA 1
9
RDB 2
5
SDA 3 6
SDB 4
1
FG 5
3
Shielded wire
Set the 2-/4-wire switch
The terminating resistance (220 Ω) is set
to the 4-wire setting.
with the terminal block switch.
Turn ON the terminating
resistance switch.
A Standard System Protocol
Terminal
220 Ω
block switch
220 Ω
Terminal
220 Ω
block switch
Abbreviation
SDA
SDB
RDA
RDB
SG
220 Ω
SN751177N or equivalent
SN751177N
or equivalent
6.8V
R-39