Multiplexed alarm system

Details Multiplexed alarm system Multiplexed alarm system

1986-08-08

1988-06-28

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340502, 340505, 340531, 34082514, G08B 2600

Patent

active

047542624

ABSTRACT:
A multiplexing method for an alarm system is disclosed in which a plurality of transponders connected in parallel by a pair of wires each monitors an opening and responds to a synchronizing signal after a preprogrammed time delay corresponding to the particular transponder if the opening it is monitoring is secured.

REFERENCES:
patent: 3927404 (1975-12-01), Cooper
patent: 3930246 (1975-12-01), Campbell
patent: 4056684 (1977-11-01), Lindstrom
patent: 4162488 (1979-07-01), Silverman et al.
patent: 4203096 (1980-05-01), Farley et al.
patent: 4228424 (1980-10-01), Le Nay et al.
patent: 4367458 (1983-01-01), Hackett
patent: 4392125 (1983-07-01), Iwata

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