![]() Request-to-exit devices can be a push-button or a motion detector. In cases where exit is not controlled, free exit, a device called a request-to-exit (REX) is used. In cases where exit is also controlled, a second reader is used on the opposite side of the door. ![]() Generally only entry is controlled, and exit is uncontrolled. In concept, the door switch is not unlike those on refrigerators or car doors. To monitor the door position a magnetic door switch can be used. ![]() Readers do not usually make an access decision, but send a card number to an access control panel that verifies the number against an access list. The reader could be a keypad where a code is entered, it could be a card reader, or it could be a biometric reader. To automate this, operator intervention is replaced by a reader. The lock is unlocked by an operator with a switch. At its most basic, there is a stand-alone electric lock. An electronic access control door can contain several elements. "An access control point, which can be a door, turnstile, parking gate, elevator, or other physical barrier, where granting access can be electronically controlled. Alarm devices are often outfitted with a siren." "An alarm device or system of alarm devices gives an audible, visual or other form of alarm signal about a problem or condition. The vector stencils library Alarm and access control contains 80 symbols of digital proximity equipment, locking hardware, and access control equipment.
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