2-wire video door intercom systems carry both power and audio-video signals over a single twisted pair between the door station and indoor monitors using proprietary protocols from Comelit, Fermax, and BTicino.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | BUS+ | 2-wire bus positive | PWR |
| 2 | BUS- | 2-wire bus negative | BUS |
2-wire video door intercom systems carry both power and audio-video signals over a single twisted pair between the door station and indoor monitors using proprietary protocols from Comelit, Fermax, and BTicino.