Abstract: An access control system for controlling and monitoring access to selected restricted areas and "alarm" conditions at such areas. The system comprises a central controller unit which repeatedly polls a number of remotely located reader terminals and alarm monitors. The reader terminals are adapted to receive and "read" magnetically encoded card keys issued to personnel and to sense "alarm" conditions at such areas. When a card key which has a proper facility code on it, is inserted into a card activated lock, a card reader at a reader terminal determines whether the card key is magnetically encoded so as to meet all entrance criteria stored in a memory of the central controller. If the card is properly encoded, access is granted to the cardholder at that location.

Abstract: A parking gate of the type having a blocking arm located horizontally above the ground during its blocking position and pivotable at one end so as to be raised to permit passage of a vehicle when a switch is activated is disclosed. Electronic logic circuitry is associated with an electrically reversible motor for controlling the timing and direction of the rotation of the motor to control the movement and direction of the blocking arm.