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:
Aug. 03, 1999
Filed:
Jun. 20, 1997
William R Vogt, County of Morris, NJ (US);
Leonard Noonan, County of Sussex, NJ (US);
Wells Fargo Alarm Services, Inc., King of Prussia, PA (US);
Abstract
An alarm system includes a controller (20), a plurality of transponders (23-26), and a transducer (50) connected to one of the transponders (23). A voltage reference which is preferably earth ground is established for the entire alarm system. A local loop comprises a pair of electrical conductors (72, 73) connecting the transducer and transponder. The transponder includes a comparator (70, 80, 80-82) having a fixed reference input and a second input which is the voltage level on the local loop. If a ground fault or other abnormal condition occurs, this is sensed by the comparator and an indication provided a loop status portion (60a) of the transducer. The controller includes a communications module (27) by which each transponder is addressed, and the transponder includes an output response portion (60b) by which the transponder identifies itself to the controller as the transponder at which the ground fault or other abnormal condition has occurred.