Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1997-06-20
1999-08-03
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340508, 34082516, G08B 2900
Patent
active
059330775
ABSTRACT:
An alarm system includes a controller (20), a plurality of transponders (23-26), and a transducer (50) connected to one of the transponders (23). A voltage reference which is preferably earth ground is established for the entire alarm system. A local loop comprises a pair of electrical conductors (72, 73) connecting the transducer and transponder. The transponder includes a comparator (70, 80, 80-82) having a fixed reference input and a second input which is the voltage level on the local loop. If a ground fault or other abnormal condition occurs, this is sensed by the comparator and an indication provided a loop status portion (60a) of the transducer. The controller includes a communications module (27) by which each transponder is addressed, and the transponder includes an output response portion (60b) by which the transponder identifies itself to the controller as the transponder at which the ground fault or other abnormal condition has occurred.
REFERENCES:
patent: 4249166 (1981-02-01), Schultz
patent: 4470047 (1984-09-01), Vogt et al.
patent: 4850018 (1989-07-01), Vogt
patent: 4916432 (1990-04-01), Tice et al.
patent: 4951029 (1990-08-01), Severson
Noonan Leonard
Vogt William R.
Crosland Donnie L.
Wells Fargo Alarm Services, Inc.
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