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Appendix BCompoWay/F Master Protocol
152
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 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-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
Communications
Board
6
8
1
2
*1: Set the 2-/4-wire switch
to the 4-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
RS-485 2-wire Connections
• RS-485 connections can be one-to-one or one-to-N. A maximum of 32 Serial Communications 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.
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
Note SYSMAC BUS Wired Remote I/O devices cannot be connected.