Access and/or presence control system

A control system, configured to detect presence of unauthorised subjects in an area under control, comprising a central processing and control unit (100) connected to at least one detection apparatus (200) configured to communicate with at least one portable RFID device (300) associated with a subject authorised to access the area under control, wherein said at least one portable RFID device comprises a radio frequency transmitter module (305) connected to an accelerometer (315) that is configured to detect movements of the portable RFID device (300), wherein the portable RFID device (300) is configured to be powered by a battery (325), wherein the accelerometer (315) is configured to send to the radio frequency transmitter module (305) a value of detected acceleration of the portable RFID device (300), and the radio frequency transmitter module (305) is configured to recognize when said value of detected acceleration is higher than a minimum threshold and, in this case, to activate for a transmission period a transmission of a radio frequency signal including an identification code, wherein said at least one detection apparatus (200) comprises a RFID reading device (210) connected to a detection device (250), wherein the RFID reading device (210) is configured to receive a radio frequency signal emitted by said at least one portable RFID device (300) in at least one portion of the area under control, to extract a code from said radio frequency signal and to compare said extracted code with one or more identification codes associated with one or more subjects authorised to access at least said portion of the area under control, wherein the detection device (250) is configured to detect a presence and/or access of at least one subject in said at least one portion of the area under control and to consequently send a detection signal to the central processing and control unit (100), wherein, when the RFID reading device (210) ascertains that said extracted code corresponds to one of said one or more identification codes associated with one or more subjects authorised to access at least said portion of the area under control, the RFID reading device (210) is configured to inhibit for an inhibition period sending of said detection signal to the central processing and control unit (100), wherein the central processing and control unit (100) is configured to generate an alarm when it receives said detection signal.