building intercom, an internal communication system used in residential buildings. Its main purpose is to control the electric lock on the door outside the building. After confirming the identity of the visitor through the remote intercom, the electric lock can be opened remotely to allow the visitor to enter the residential building. So, from a home security perspective, it's a "guest admission system" implemented using technology similar to a phone system. Its basic composition is an indoor extension and a door host.
The door host is provided for the use of external visitors. The visitor dials the indoor unit by pressing the keyboard of the host, and the indoor unit rings to remind the owner that there is a visitor. The indoor user is like using a telephone, and he/she lifts the phone to talk. During the call, press the indoor unit. The unlock button on the remote control opens the door electric lock. And now the building intercom has developed to a higher level of application, such as calling other hosts, calling security has played a role in joint defense. Moreover, the indoor unit function is extended to small conferences and the function of communicating with households (that is, neighbors can talk to each other in the networked community). That is to say, the current building intercom has combined the application of residential security and life intelligence. For more functions, please refer to some building intercom manufacturers. Such as China Wenzhou Weishilong, Fujian Guanlin, some companies in Guangzhou. They all have their different characteristics, so building intercom is not a simple application of VTO calling the indoor unit and the indoor unit making a response.
Weak current engineering related technologies for smart buildings