Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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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.
Send/Receive with ASCII Conversion, with Response:
(Sequence No. 606 (Hex 025E))
• Send word order: Leftmost to rightmost
• Receive word order: Leftmost to rightmost
This sequence converts the specified data beginning with the command code (MRC, SRC) to ASCII and sends
it to the specified Unit. The response is converted to hexadecimal and stored starting at the specified word.
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.
Ter-
minal
RS-485
Abbreviation
Shield
Shield
Intelligent Signal
Processor end-station
SN751177N or equivalent
Ter-
minal
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
Ab-
brevi-
ation