Danger alarm system

Details Danger alarm system Danger alarm system

1979-04-13

1981-02-10

Konick, Bernard

H04M 1104

Patent

active

042503531

ABSTRACT:
A danger alarm system has a plurality of call lines and a plurality of alarm circuits respectively connectible to the call lines and operable to provide signals indicative of environmental conditions about the alarm circuits. A central exchange is connected to the call lines and includes a write-read memory and means connected thereto for inputting the busy condition of each of the lines. A multiplexer is connected between the lines and the memory for sequentially interrogating the memory and the lines. Evaluation circuits are provided and operated upon comparison of the call line signals and the corresponding memory locations.

REFERENCES:
patent: 3842208 (1974-10-01), Paraskevakos

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