RS-232 Information Database


Pin Details
9way Pin What? 25way Pin What?
Pin 1 Dcd Pin 1 NC
Pin 2 Rx Pin 2 Tx
Pin 3 Tx Pin 3 Rx
Pin 4 Dtr Pin 4 Rts
Pin 5 Gnd Pin 5 Cts
Pin 6 Dsr Pin 6 Dsr
Pin 7 Rts Pin 7 Gnd
Pin 8 Cts Pin 8 Dcd
Pin 9 Ri Pin 9 TxLoop+
    Pin 10 NC
    Pin 11 TxLoop-
Direct Conv Pin 12 NC
From 9p to 25p Pin 13 NC
1 8 Pin 14 NC
2 3 Pin 15 NC
3 2 Pin 16 NC
4 20 Pin 17 NC
5 7 Pin 18 RXLoop+
6 6 Pin 19 NC
7 5 Pin 20 Dtr
8 5 Pin 21 NC
9 22 Pin 22 Ri
    Pin 23 NC
    Pin 24 NC
    Pin 25 RxLoop-


Half duplex Null Modem
From 9 pin to 9 pin to 25 pin From 25 Pin
2 3 2 3
3 2 3 2
5 5 7 7


Full duplex Null Modem
From 9 pin To 9 pin To 25 pin From 25 pin
    1 1
3 2 3 2
2 3 2 3
7 8 5 4
8 7 4 5
6 4 20 6
4 6 6 20
5 5 7 7

 

Disclaimer: this information is provided as is and is not guarateed against any errors.The author is not responsible for any inaccuracies in the above data.


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