Installation guide

A-4
RS-232 Loopback Tester
Pin Signal
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
RS-422 Loopback Tester
Pin Signal
1 TxD-(A)
2 TxD+(B)
3 RxD+(B)
4 RxD-(A)
5 GND
6 RTS-(A)
7 RTS+(B)
8 CTS+(B)
9 CTS-(A)