Omron CJ1W-SCU41, Operation Manual

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220
CompoWay/F Master Protocol Appendix B
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 maxi-
mum 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 at the device at each end of the transmission line.
RS-485 2-wire Connections
• RS-485 connections can be one-to-one or one-to-N. A maximum of 32 Serial Communications 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 terminator switches only in the devices at each end of the transmission line.
Note SYSMAC BUS Wired Remote I/O devices cannot be connected.
RS-422
Abbreviation
Shell
Ab-
brevi-
ation
Pin
No.
Shield
Intelligent Signal
Processor
220
Ω
220
Ω
SN751177N or equivalent
The terminator (220
Ω
) is set with the terminal block switch.
Terminal
block switch
Serial Commu-
nications Board/Unit
6
8
1
2
*1: Set the 2-/4-wire switch
to the 4-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
Intelligent Signal Processor
Turn OFF all terminal block
switches except at the end-station.
Termi
nal
RS-485
Abbreviation
Ab-
brevi
ation
Shield
Shield
Intelligent Signal
Processor end-station
SN751177N or equivalent
Termi
nal
Ab-
brevi
ation
220
Ω
220
Ω
Terminal
block
switch
Terminal
block switch ON
Terminal block switch ON at the end station.
*1: Set the 2-/4-wire switch
to the 2-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
Shell
1
2
+
+
Serial Communications Board/Unit