Apparatus and method for detecting undesirable connections in a

Communications: electrical – Condition responsive indicating system – With particular system function

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340505, 340508, 34082516, G08B 2900

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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

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