Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1983-08-08
1986-01-28
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340508, 340510, 340511, 340518, G08B 2900
Patent
active
045674710
ABSTRACT:
A monitoring system for a protection loop that has a plurality of switches in series utilizes modules with inexpensive diodes and resistors, and is conveniently and easily added to existing burglar alarm circuits and loops. A monitoring module that includes a diode and a paralleled resistor is connected across each switch. First and second interrogating signals are alternately applied to the protection loop. First comparator circuit means provides an output in response to each first interrogating signal when one of the monitored switches in the protection loop is open as indicated by the response of the module resistors; and second comparator circuit means provides an output in response to each second interrogating signal when more than one of the monitored switches in the protection loop is open as indicated by the response of the module diodes.
REFERENCES:
patent: 3518655 (1970-06-01), Saul
patent: 4117479 (1978-09-01), Galvin et al.
patent: 4118700 (1978-10-01), Lenihan
patent: 4218677 (1980-08-01), Wilson, Jr. et al.
patent: 4257037 (1981-03-01), Mongeon
patent: 4270121 (1981-05-01), Verr
patent: 4274087 (1981-06-01), Swanson et al.
patent: 4369436 (1983-01-01), Lautzenheiser
patent: 4423410 (1983-12-01), Galvin et al.
patent: 4435700 (1984-03-01), Alley
Crosland Donnie L.
Pittway Corporation
LandOfFree
Monitoring 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 Monitoring system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monitoring system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1309082