Understand the working principle of electric lock, electromagnetic lock, automatic door and elevator door.

Electric locks, electromagnetic locks, automatic doors and elevator doors are all equipment that we often come into contact with in our daily life. This article will introduce the working principle of these devices to help you understand them better.

Electric lock and electromagnetic lock

Electric lock and electromagnetic lock only need to input level signal, usually DC level, and lock the door as soon as it is energized. In this way, the positive and negative poles of the lock are directly connected to the access controller, and the door can be locked when it is normally closed after power-on.

Automatic?Door?

The working principle of automatic door is that when the temperature difference between human body and environment is sensed, the infrared sensor will send a signal to the controller, and the relay on the controller will start to work and the motor will start to open the door.

Elevator door

The working principle of the elevator door is to install a pair of active infrared detection sensors from top to bottom on the door frame of the closed part of the elevator door. When the receiver can't receive infrared light, it will send a signal to the controller and the elevator door will open. The self-locking device starts to work and locks the elevator to move up and down.

serial communication

Communication between access controller and computer usually uses serial port. For example, it will be used when authorizing cards, monitoring access control status and transmitting data. Interface is generally RS485-RS232 communication converter.