Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 408

CompoWay/F Master Protocol
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.
*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 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.
Serial Communications Board/Unit
RS-485
Abbreviation
*1: Set the 2-/4-wire switch
to the 2-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
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.
Serial Commu-
nications Board/Unit
RS-422
Abbreviation
Shell
6
8
1
2
Shield
The terminator (220 Ω) is set with the terminal block switch.
Intelligent Signal Processor
Turn OFF all terminal block
switches except at the end-station.
Ab-
Ter-
brevi-
minal
Shell
ation
1
+
2
Shield
Shield
Intelligent Signal
Processor
Terminal
220 Ω
block switch
Ab-
Pin
brevi-
No.
ation
220 Ω
Terminal
block
220 Ω
switch
Intelligent Signal
Processor end-station
Terminal
Ab-
Ter-
block switch ON
220 Ω
brevi
minal
ation
+
Terminal block switch ON at the end station.
Appendix B
SN751177N or equivalent
SN751177N or equivalent
379