FIELD: physics.
SUBSTANCE: according to the invention, the access control unit has an optical reading unit (6) connected to the control/processing unit (5), wherein the door communication system device or the building engineering system for activating the optical reading unit by the control/processing unit is equipped with a motion sensor or proximity sensor, or a key switch (8).
EFFECT: providing access release in the standby mode and activating a costly image analysis mechanism by means of the reading unit only at suitable times.
9 cl, 1 dwg
