SENTRACON

ELECTRONIC MONITORING AND CONTROL SYSTEMS FOR BUILDINGS AND ELEMENTS OF SUCH SYSTEMS-NAMELY, AN ELECTRONIC MONITORING AND CONTROL SYSTEM HAVING A CENTRAL PANEL WHICH INDICATES THE STATE OF REMOTE UNITS TRIGGERED BY FIRE, SECURITY, AND OTHER DETECTORS AND WHICH CONTROLS REMOTE UNITS SUCH AS ELECTRIC LOCKS, BLOWERS, SPRINKLERS, AND THE LIKE, SOME REMOTE UNITS BEING CARD READERS WITH CODED CARDS THAT ACTIVATE THE CARD READERS ON THE INSERTION OF A CARD THEREIN