Because the elevator access control system is an intelligent electronic control system, it can make full use of the "intelligence" of the computer and use various means to control it to ensure the safety and reliability of the system. The reliability of the hardware, in addition to mechanical components such as electric control locks, mainly considers the production and selection of the sub-control module, because it has to work 24 hours a day, so it has high performance requirements and should be able to meet the environmental requirements. Changes in temperature and humidity, and strong anti-electromagnetic interference capabilities. If the selected module has a strong self-adaptive function, it can automatically adjust signals with different baud rates, and there are various protection circuits, etc., which can meet the needs of low-level management work.
The reliability of software design mainly considers the acquisition and maintenance of various status information, whether the design of communication protocols is standardized, whether the handling of various special situations is reasonable, and so on. For example, in order to ensure that the communication between the main control computer and the sub-control module is accurate, an automatic retransmission error correction mechanism can be used to effectively eliminate signal conflicts that may occur when the access control subsystem and the management computer work in the network at the same time. The card access control system is an access control system that needs to swipe the card for authority management. Before the access control card is issued to the end user, it is set by the system administrator to determine the usable area and user authority. The user uses the access control card to swipe the card to enter the management area without access control card or authority. Unregistered users cannot enter the management area.
The card reader sends out electromagnetic waves at a fixed frequency, the frequency is generally 13.56MHZ. When the proximity card enters the electromagnetic wave radiation range of the card reader, it will trigger the coil on the proximity card, generate current and trigger the antenna on the proximity card to read the card. The card reader transmits a signal, which contains card information, and the card reader converts the level signal into a digital serial number, and transmits it to the local controller through the communication protocol, and the local controller uploads the information to the upper controller, and finally uploads it to the access control The server, the access control server compares the card number with the information in the database, so as to obtain all the card information.
Author:Written by Ms.Vivian He 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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