SECURITY MONITORING AND CONTROL SYSTEMS; NAMELY ELECTRONIC SECURITY AND CONTROL UNITS FEATURING, CENTRAL SECURITY AND CONTROL MONITORS, CONTROLLERS AMD PARTS THEREOF, PERIPHERAL ENCODERS AND DECODERS FEATURING COMPATIBLE ELECTRONIC CARD SET; ELECTRONIC TIME AND ATTENDANCE UNITS, COMPRISING, CARD READERS, DATA ACQUISITION APPARATUSES, CARD RECORDERS AND COMPUTER PROGRAMS FOR TIME AND ATTENDANCE PRODUCING APPLICATIONS; ELECTRONIC CENTRAL ALARM PROCESSING AND MONITORING UNITS