| The system automatically detects the following circuit types when a device is connected to a digital station port. |
| Option | Description |
|---|---|
| 00 | Undefined |
| 01 | DSX 22 Button |
| 02 | DSX 34 Button |
| 03 | DSX Super Display |
| 04 | DS 22 Button Non-display |
| 05 | DS 22 Button Display |
| 06 | DS 34 Button |
| 07 | DS Super Display |
| 08 | Cordless Telephone |
| 09 | Single Line Telephone |
| 10 | 2PGDAD Module Analog Door Box |
| 12 | 2PGDAD Module Audio Port |