| 25 Pins | 9 Pins | Signal | Richtung | Bedeutung |
|---|---|---|---|---|
| 1 | - | PG | - | Protective |
| 2 | 2 | TD | Eingabe | Transceive data |
| 3 | 3 | RD | Ausgabe | Receive data |
| 4 | 7 | RTS | Eingabe | Request to send |
| 5 | 5 | CTS | Ausgabe | Clear to send |
| 6 | 6 | DSR | Ausgabe | Data set readily |
| 7 | - | GND | - | Signal ground |
| 8 | 1 | DCD | Ausgabe | Data carrier detect |
| 9-19 | - | NC | - | Not connected |
| 20 | 4 | DTR | Eingabe | Data terminal ready |
| 21 | - | NC | - | Not connected |
| 22 | 9 | RI | Ausgabe | Ring indicator |
| 23 | - | NC | - | Not connected |
| 24 | - | NC | - | Not connected |
| 25 | - | NC | - | Not connected |