Communications: electrical – Systems – Selsyn type
Patent
1974-06-19
1976-06-15
Pitts, Harold I.
Communications: electrical
Systems
Selsyn type
34008, 340310A, 340171PF, H04Q 900
Patent
active
039640477
ABSTRACT:
The transmitter of a fire-alarm audible signaling system permitting selective communications and signaling transmits digital command signals to receiver-drivers respectively positioned in a number of fire zones over a single two-wire or three-wire circuit that also provides power to the receiver-drivers. Each command signal includes a frame bit, a zone designator comprising, say, four bits and a function designator comprising, say, three bits. The frame bit is always a one and is always the first bit of the command signal, and it serves as a reference. A comparator in each receiver-driver compares an identification code proper to that receiver-driver with the zone designator of each command signal, and each receiver-driver responds to the function designator of a command signal to perform the designated function only in case of a match between the zone designator of the same command signal and the identification code for that receiver-driver. The system continuously monitors itself to ensure that it is in proper working order, and trouble signals are activated in case of a malfunction. The trouble signals indicate the zone in which a malfunction occurs.
REFERENCES:
patent: 3045210 (1962-07-01), Langley
patent: 3350687 (1967-10-01), Gabrielson
patent: 3423521 (1969-01-01), Friesen
patent: 3516063 (1970-06-01), Arkin
patent: 3796994 (1974-03-01), Nuss
patent: 3803491 (1974-04-01), Osborn
Pitts Harold I.
Wheelock Signals, Inc.
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