CONTROL DEVICE FOR ENTRANCE AND EXIT

摘要

PURPOSE:To surely carry out the control of an entrance and an exit without touch even in a relatively bad electric-wave environment by varying the methods of transmission and checking of data according to a security level. CONSTITUTION:A trigger signal and a data requiring signal are always output from a sensor 2 at fixed intervals. When a card 1 comes close the main power supply of the card 1 is turned on in response to the trigger signal. A data requiring signal (four columns =32 bits) is transmitted and then the card 1 transmits an ID code (if there are, e.g. ten columns 80 bits are offered and if transmission velocity is 4.8kbts 1bit =0.2msec) in response to the data requiring signal and the sensor 2 receives the ID code and checkes whether the card is OK or NG, and when the card is OK the sensor 2 sends an OK signal to an electric lock control board 3 so that an electric lock 4 is released.