Belegung des COM-Ports (RS-232) PC-seitig (Stecker):
| Pin | Richtung | Signal |
| 1 | Eingang | DCD – Data Carrier Detect |
| 2 | Eingang | RXD – Receive Data |
| 3 | Ausgang | TXD – Transceive Data |
| 4 | Ausgang | DTR – Data Transmission Ready |
| 5 | Ground | GND |
| 6 | Eingang | DSR – Data Set Ready |
| 7 | Ausgang | RTS – Ready To Send |
| 8 | Eingang | CTS – Clear To Send |
| 9 | Eingang / Power | RI – Ring Indicator |
| Shield | Case Ground |