Yaoda building intercom 4-wire command?

1. Every household on the host has a call button, and each button is connected with the corresponding household through a call line. You can directly call the household by pressing the household call button.

2. The connecting system of intercom system in this kind of building needs a call connecting line in addition to the four public lines of sending line, receiving line, unlocking line and ground line. If there are 20 households in this building, 20 telephone lines are needed.

3. Building intercom system is a management system that realizes mutual communication and information exchange among visitors, residents and property management centers in multi-storey or high-rise buildings, and realizes the control of safe access to residential areas, commonly known as doorbell system.

To put it simply, building intercom refers to your doorbell. The words building intercom, visual non-visual doorbell, visual non-visual intercom and intercom doorbell are all of the same meaning.

5. It refers to a visitor intercom management system (including a humanized guest management operating system of software, hardware and after-sales service).

Four-wire video doorphone has four transmission lines, in which the red line is the main power supply B+ (positive power supply), the black line is the whole machine grounding line (negative power supply), the blue line is the audio transmission line (voice signal transmission line), and the yellow line is the video transmission line (image signal transmission line).