RS-232 Pin map
Pin map RS-232, 9pin, 25pin Signal DB9 DB25 Description DCD 1 8 Data Carrier Detect RxD 2 3 Received Data (by DTE) TxD 3 2 Transmitted Data (by DTE) DTR 4 20 Data Terminal Ready GND 5 7 Signal Ground DSR 6 6 Data Set Ready RTS 7 4 Request To Send CTS 8 5 Clear To Send RI 9 22 Ring Indicator 두근두근병수님의 Blog에서 퍼왔습니다.