G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.1
G08B 27/00 (2006.01) G08B 13/16 (2006.01) G08B 13/24 (2006.01) G08B 25/00 (2006.01)
Patent
CA 1106464
ABSTRACT OF THE DISCLOSURE An intrusion alarm system has a number of satellites each connected to a master by an unshielded cable having only four conductors, namely two power conductors, a drive signal conductor which supplies drive to the satellite transmitter and the satellite control circuit, and an alarm conductor. When an intrusion is detected by a satellite, its control cir- cuit transmits a high level alarm signal on the alarm conductor to the master and also sets a latch in the satellite. The master has a rocker switch which an investigator turns off when he arrvies at the super- vised premises. This turns off the drive signal to the satellite and causes a counter in the master to send a set of interrupting counting pulses to the satellites on the drive conductor. Each satellite has a counter which counts the pulses if that satellite's latch has been set and sends a pulse back to the master on the alarm conductor immediately after the count associated with that counter. The received pulses are recorded in a register in the master and then displayed to show the status of the satellites. A tamper switch in each satellite operates if the satellite has been tampered with and also sets the latch, so that with the satellite transmitter off, the status of the tamper switches can be annunciated. A test transceiver having its own transmitter and receiver is provided to test each satellite.
301269
Bereskin & Parr
Contronic Controls Limited
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