Access Control System is the selective restriction of access to a place or other resource.
when a credential is presented to a reader, the reader sends the credential’s information, usually a number, to a control panel, a highly reliable processor.The control panel compares the credential’s number to an access control list, grants or denies the presented request, and sends a transaction log to a database. When access is denied based on the access control list, the door remains locked.
If there is a match between the credential and the access control list, the control panel operates a relay that in turn unlocks the door. The control panel also ignores a door open signal to prevent an alarm. Often the reader provides feedback, such as a flashing red LED for an access denied and a flashing green LED for an access granted.
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