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Connection Option (Opt8x) and Cable Wiring
Smartio C168H/HS User’s Manual 5-9
The followings are operation modes for RS-422:
RS-422 Point-to-point RS-422 Broadcasting
Opt8J/F/Z RS-422 Device Opt8J/F/Z RS-422 Device 1
3 TxD+(B) RxD+(B) 3 TxD+(B) RxD+(B)
16 TxD-(A) RxD-(A) 2 RxD+(B) TxD+(B)
2 RxD+(B) TxD+(B) 16 TxD-(A) RxD-(A)
14 RxD-(A) TxD-(A) 14 RxD-(A) TxD-(A)
7 GND GND 7 GND GND
RS-422 Device N
RxD+(B)
TxD+(B)
RxD-(A)
TxD-(A)
GND
Opt8J RS-422 with Handshaking
Opt8J RS-422 Device
3 TxD+(B) RxD+(B)
16 TxD-(A) RxD-(A)
2 RxD+(B) TxD+(B)
14 RxD-(A) TxD-(A)
7 GND GND
5 RTS+(B) CTS+(B)
13 RTS-(A) CTS-(A)
4 CTS+(B) RTS+(B)
19 CTS-(A) RTS-(A)