Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-07-29
1995-02-07
Strecker, Gerard R.
Communications: electrical
Condition responsive indicating system
With particular system function
340508, 340513, 324542, 324555, G08B 2900, G01R 3102
Patent
active
053878990
ABSTRACT:
An alarm system is described wherein both an open connection between an alarm monitor and an alarmed unit or a short circuit across the connection between the monitor and the unit can be detected. A controllable, normally open test device is placed in parallel with a normally open alarm contact. If current flows when the test device is open, either a short circuit or an alarm condition exists. If current does not flow when the test device is closed, an open connection between the monitor and the unit exists. Advantageously, the integrity of connections between alarm monitors and alarmed units is enhanced.
REFERENCES:
patent: 3618081 (1971-11-01), Morrow
patent: 4376277 (1983-03-01), Black
patent: 4823089 (1989-04-01), Eckhaus et al.
patent: 4926162 (1990-05-01), Pickell
"Adaptive Design Engineering, Alarm and Telemetry Systems", AT&T Network Systems brochure, 1991; includes inserts on Personal Computer Alarm Monitoring Systems, Alarm Monitoring System, & Alarm Telemetry System
DiLauro Amato A.
Kriete Richard J.
Micallef George S.
Zaltsman Vladimir
AT&T Corp.
Do Diep
Strecker Gerard R.
Ulrich Werner
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