Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1978-04-20
1980-05-06
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340152T, 340514, 340552, 343 5PD, G08B 2900
Patent
active
042019826
ABSTRACT:
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 circuit 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 arrives at the supervised 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.
REFERENCES:
patent: 3932870 (1976-01-01), Shapiro et al.
patent: 3938118 (1976-02-01), Galvin et al.
patent: 4101875 (1978-07-01), Humphries
Caldwell Sr. John W.
Contronic Controls Limited
Crosland Donnie L.
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