Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1987-08-17
1989-07-18
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340508, 340512, 340513, G08B 2900
Patent
active
048497347
ABSTRACT:
A self-diagnostic circuit for use in alarm systems and the like, of the kind having a plurality of alarm detection switches connected in a loop, indicators associated with each of the switches for indicating locally the detection of an alarm condition and a central controller for reversing voltage polarity in the loop whenever an alarm condition is detected by one of the switches. The self-diagnostic circuit comprises: a first switch for detecing an alarm condition connected in an alarm loop; a second switch automatically activatable in response to operation of the first switch; an alarm indicator automatically operable in response to activation of the second switch; and, an automatically operable circuit for preventing deactivation of the second switch until after diagnosis of alarm system operation, even when the first switch no longer detects the alarm condition. Any such first switch exhibiting erratic switching behavior can be easily identified by continued operation of the associated alarm indicator.
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Crosland Donnie L.
Self Diagnostic Security Devices, Inc.
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