The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 1976
Filed:
Jun. 19, 1974
Joseph C Antonaccio, Hazlet, NJ (US);
Wheelock Signals, Inc., Long Branch, NJ (US);
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.