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How an HID Proximity Card Works
A proximity card by HID is a card with embedded information inside. The information does not have the capability of accessing a secure area within itself, but the card is part of a system that allows access control.
The card is part of a complete system that comprises of the cards, a card reader, an access control panel and computer. The system functions as a security officer that guards a secure area and allows only authorized individuals to enter.
The card contains an embedded binary code that identifies the card holder by a specific sequence of number. The card is read by a card reader close to the access door. The reader transfers the information to the access control panel for deciphering.
When the controller receives the data that is transmitted by the card reader, the controller begins processing the information. The controller first reviews the length of the data string and also the format of the binary code. If the controller can identify these items, the next step is to review the facility code and the site code for a match. If these items match, then the actual card number is review for a database match. If the number is present and the card number is allowed to activate doors during the time frame, the controller sends authorization to the lock mechanisms to allow the door to open.
Some systems will provide a specific negative response to the cardholder whose card is rejected. Other systems do not provide any response at all.
The system hosts the controller has a software application available so that security personnel can update and authorize card holder information. The system also has a system that will allow the door access hardware to be configured. Reporting functions are also available through the system.
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