RS-232 DB37 Male Connector Pinouts

 

PIN SIGNAL PIN SIGNAL
1 20 RI(3)
2 DCD(3) 21 DTR(3)
3 GND 22 DSR(3)
4 CTS(3) 23 RTS(3)
5 RxD(3) 24 TxD(3)
6 RI(4) 25 DCD(4)
7 DTR(4) 26 GND
8 DSR(4) 27 CTS(4)
9 RTS(4) 28 RxD(4)
10 TxD(4) 29 RI(2)
11 DCD(2) 30 DTR(2)
12 GND 31 DSR(2)
13 CTS(2) 32 RTS(2)
14 RxD(2) 33 TxD(2)
15 RI(1) 34 DCD(1)
16 DTR(1) 35 GND
17 DSR(1) 36 CTS(1)
18 RTS(1) 37 RxD(1)
19 TxD(1)

 

RS-232 DB9 Male Connector Pinouts

 

PIN SIGNAL
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI