Security alarm system

Details Security alarm system Security alarm system

1983-04-06

1985-12-17

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, 340693, 455 7, 455 53, G08B 108, H04Q 700

Patent

active

045595267

ABSTRACT:
A security system comprising a plurality of sensors for detecting emergencies in a predetermined guard area, a transmitter-receiver for converting the emergency data into electric signals and transmitting the electric signals via a radio, a repeater for receiving the electric signals from the transmitter-receiver and transmitting the signal to a security controller, a security controller for setting a guard mode such as "start watch", and "release the watch" and transmitting the emergency and ordinary data to a central station through a transmission line such as a telephone cable or personal circuit, and a central station for supervising the predetermined guard area based on the data from this and other security controllers.

REFERENCES:
patent: 3914692 (1975-10-01), Seaborn, Jr.
patent: 3925763 (1975-12-01), Wadhwani et al.
patent: 4092643 (1978-05-01), Stolarczyk
patent: 4455551 (1984-06-01), Lemelson

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