Alarm termination apparatus

Details Alarm termination apparatus Alarm termination apparatus

1994-09-27

1997-07-01

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

With particular system function

340517, 340518, 34082536, 364140, 364141, G08B 2900

Patent

active

056442920

ABSTRACT:
An alarm termination apparatus includes: a bi-directionally accessible random access memory for storing alarm bits sampled from a plurality of parallel inputs at memory locations; a flip-flop circuit for temporarily storing a first alarm bit read from one of the memory locations of the memory and for outputting the first alarm bit to an output transmission line; and a selector for receiving a second alarm bit sampled from the parallel inputs and for receiving the stored first alarm bit from the flip-flop circuit, the selector selectively outputting the second alarm bit or the first alarm bit to the above one of the memory locations of the memory in accordance with a value of a select pulse, wherein the temporary storing of the first alarm bit from the memory into the flip-flop circuit and the selective outputting of the first alarm bit or the second alarm bit to the memory by the selector are controlled to sequentially take place.

REFERENCES:
patent: 4303990 (1981-12-01), Seipp
patent: 5299193 (1994-03-01), Szczepanek

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