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Connection Option (Opt8x) and Cable Wiring
Smartio C168H/PCI User’s Manual 5-9
The followings are operation modes for RS-422:
RS-422 Point-to-point RS-422 Broadcasting
Opt8F/Z RS-422 Device Opt8F/Z RS-422 Device I
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)