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 |