A-1
A
A
A. Cable Pinouts
DB9 Male Port Pinouts
1
5
96
PIN RS-232 RS-422 2-wire RS-485
1 DCD TxD-(A) Data-(A)
2 RxD TxD+(B) Data+(B)
3 TxD RxD+(B) ---
4 DTR RxD-(A) ---
5 GND GND GND
6 DSR RTS-(A) ---
7 RTS RTS+(B) ---
8 CTS CTS+(B) ---
9 --- CTS-(A) ---
