Alarm loop supervision
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United States of America Patent
Stats
-
Jul 16, 1985
Grant Date -
N/A
app pub date -
Mar 14, 1983
filing date -
Mar 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for indicating a break in the lines leading from a base station to a monitored instrumentality. Two pairs of wires conduct signals to each contact of a normally open switch-like element in the monitored instrumentality (the closure of which signifies an alarm condition) and return these signals to the base station. The presence or absence of the return signals at predetermined times indicates the condition of the lines and also an alarm condition, even if one of the lines leading to the instrumentality is broken.
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Cited Art Landscape
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