The door sensor is a small sensor used to detect whether the door is closed. There are many electric locks with door sensor function. We suggest that if the door sensor is used in the access control system, it is best to purchase the electromagnetic locks built-in door sensor function (with door status feedback). If the electric door lock does not have a door sensor function, you can purchase a door sensor by yourself. The size of door sensor is small like a coin, and the price is very cheap.
For Example:
EL-600SD built in LED,door sensor and time delay( 12V,GND,NO,NC,COM)
This is a common concealed door sensor on the market. The unwired end has a built-in magnet, and the low end with a wire has components such as reed switches. When the magnet is close, the wire outputs a closing signal. When far away, the two wires output an open circuit signal. The end without wires is installed on the top of the door, and the end with wires is installed on the door frame. When the door is closed, the two ends overlap and approach. There are many kinds of door sensors on the market, which can be used on doors and windows.
Now let me tell you which characteristics of door sensor can be used in the access control system?
When the door is closed, it outputs a closed signal (using a multimeter to measure resistance to 0), and when the door is open, it inputs an open circuit signal (using a multimeter to measure infinite resistance).
P.S. 90% of the door sensors on the market have this characteristic. There are a small number of door sensors that have the opposite characteristics, or both the closed signal and the open signal are output (three wires, one is common, and the other two matching common lines output open and When the signal is closed, when you use it, you can choose one of them, another wire do not use. The door sensor of some electric locks is the same.
For example: 5-wire electric drop bolt lock (2 wires connect power supply, 3 wires are door sensor signal wires), 8-wire electric drop bolt loc (not only with door sensor output, but also with lock position status output), just leave the unused wires idle.
The main function of door sensor in the access control system:
1. When using multi-door interlock, the door sensor must be used to effectively realize the interlock function.such as: ACB-001 002 004 Network access controller built in interlock function
2. In the real-time monitoring of the software, you can see whether the current state of each door is open or closed.
3. It can be used with S4A access controller to enable the alarm of illegal entry into the door (there is no legal operation of swiping the card or pressing the button, and the door is opened, such as kicking or prying open) or the door has not been closed for a long time. we have to configure ACB-EA05 alarm output.
P.S. If you don't need the access control system with these functions, you can not connect the door sensor. If these functions are needed, connect the door sensor to the door sensor input point of the controller (S1&GND port) without distinguishing between positive and negative. If the multi-door access control system, only a few of the doors use these functions of the door sensor, other door sensor input points (S1&GND port) that do not need this function are short-circuited with wires to avoid false alarm signals.
Written by Danny Zeng(Ms.) From S4A INDUSTRIAL CO., LIMITED
Factory Address:Building S4A, South Third Lane, Qiuyuling Street, Zhangkeng Village, Hengli Town, Dongguan City, Guangdong Province Office Address:#601,floor 6 ,building 1,JINFANGHUA industrial zone, Bantian St. Longgang Dist. Shenzhen, PRC.
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