Double-detecting loop type alarm system

Details Double-detecting loop type alarm system Double-detecting loop type alarm system

1976-09-13

1978-03-14

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

340213R, 340409, G08B 1900

Patent

active

040793630

ABSTRACT:
Each zone of a double-detecting loop type alarm system utilizes a current level detector to produce a digital signal when normal current flow in the detecting loops is interrupted. The digital signal so produced is stored in a holding register, whose output drives electronic shunting switches connected across the ends of the detecting loops. Closing of the switches permits current to again flow to the current level detector and detecting loops, causing the current to return to a normal current level if the interruption was caused by a break or short in a detecting loop; this permits that zone of the alarm system to again function. Since the system is digital, its ouputs and those of the other zones are presented by means of other digital transmitting and monitoring devices, such as a binary multiplexer.

REFERENCES:
patent: 4030095 (1977-06-01), Dalman

Affiliated with

Also associated with

Rating

Double-detecting loop type alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Double-detecting loop type alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double-detecting loop type alarm system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2232825