Moxa Technologies C168HS user manual Followings are operation modes for RS-422

Connection Option (Opt8x) and Cable Wiring

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
3	TxD+(B)	RxD+(B)	3	TxD+(B)
16	TxD-(A)	RxD-(A)	2	RxD+(B)
2	RxD+(B)	TxD+(B)	16	TxD-(A)
14	RxD-(A)	TxD-(A)	14	RxD-(A)
7	GND	GND	7	GND

RS-422 Device 1

RxD+(B)

TxD+(B)

RxD-(A)

TxD-(A)

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)

Smartio C168H/HS User’s Manual 5-9