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Magnetic door is closed is used to detect a small sensor, there are a lot of power with a Magnetic Lock function is recommended that customers use the system if the access door sensor, preferably with a door sensor procurement functions (door state feedback function) of the electric lock.  If the power locks do not function with a door sensor, door sensor is free to choose, door size slightly larger than a coin, the price a few dollars or so.

Magnetic

This is a common market, the dark-mounted door sensor, one end of the wire is not built with magnets, with the lower end of wire reed switch within the possession of such components, when the magnet close, closed wire output signal, when the magnet away, the two wires output open signal.  When the door closed, both ends of the overlap exactly close.  Some Magnetic is available in the market square for surface mounted occasions, for the doors and windows.

Menci What kind of features can be used for access control systems:

Close the door closed signal when the output (with a multimeter measuring resistance to 0), open the door to open input signal.  (Infinite resistance with a multimeter)

Note: 90% of the market Menci is this characteristic, there are a few characteristics of the opposite door sensor, open signal or closing signal and have outputs (three lines, one is public, the other two lines, respectively, with the output of open and public closed signal, with time, you can choose one pair, an unused sub-features.)  Some of the electric lock door sensor, too, such as: 5-wire Electric Lock (2 is the power supply, is the door sensor signal line 3), 8 Line Electric Lock (not only with the door sensor output, and head position lock status output ), the unused line can be idle.

Magnetic in the access control system’s main role is the following:

Real-time monitoring of the software, you can see the status of each door is now open or closed.

Opening the door with the access controller may be unlawful entry (no credit card or press the button to the legal action, but the door was opened, for example, flung open or forced open) to the police.

Opening the door with the access controller can not turn off the alarm time.  Etc.

Note: If you do not need these features of the access control system, you can not take Menci.  If you need these features, it will be the door sensor door sensor to the controller input (such as S1 GND), and do not distinguish between positive and negative.  If a large multi-door access control systems, only a few doors Menci of these functions is used, then the other door sensor input (such as S1 GND) were shorted with a wire, to avoid false alarm signal.

Epathchina’s main products include all kinds of Spy Cameras , Surveillance Equipment , China Security Equipment, access control system, CCTV Surveillance System and etc. We keep updating and enriching our product lists, which aims to provide a wide range of choices for our consumers.

Sources :http://www.loqu.com/magnetic-features-principles-and-applications/blogs/astirl-12494