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All the intercom terminals connected to the LAN exist in the internal LAN. All terminals or central computers can directly access these terminals. Therefore, the entire intercom system does not require a dedicated server. This intercom system generally has the following applications:
The center shouted: The center can unilaterally speak to all, any part of the terminal or any single terminal through the network microphone.
Call center terminal: The center can call any intercom terminal through the network microphone, and the intercom terminal does not need to answer via the button (automatic answer)
Terminal call center: The intercom terminal can call the center via the button, and the center answers via the button.
Vehicle Control : The center can control one of the relays in the terminal to turn on to open the barrier.
Inlet alarm input : There is an input terminal in the entrance terminal, which can be connected to an alarm signal. When there is an alarm in the scene (for example, the rail is opened illegally), the relay of the network microphone of the control center is closed, which can drive a warning light or alarm bell.
Terminal Equipment:
NA602 intercom terminal: Direct access to the LAN via Ethernet. You can call the center or accept the call from the center to implement two-way intercom. The NA605 has a button to call the center for two-way talkback.
control center:
NM803 Network Paging Microphone: It is used to bidirectionally talk to a certain terminal, or to unilaterally announce one, several or all terminals. The NM803 network microphone has 22 keys, including function keys and numeric keys, which can be used to speak, talk and listen to any device.
With more and more use of license plate recognition, unattended parking lots are becoming more and more, and network intercom is an essential part of the parking system.
The following system diagram is a standard parking lot intercom system that can be used as an unattended (license plate recognition) parking entrance and exit intercom. Including help intercom and broadcast propaganda. It is used as a driver for on-site intercom, as well as the center's intercommunion and propaganda for the on-site drivers.