Continuity-isolation testing for class A wiring in fire alarm sy

Details Continuity-isolation testing for class A wiring in fire alarm sy Continuity-isolation testing for class A wiring in fire alarm sy

1989-05-01

1990-09-04

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340518, 340505, 340508, G08B 2900

Patent

active

049548093

ABSTRACT:
A fire alarm system in which a large number of terminal units, comprising detectors and interface circuits, at a variety of locations are coupled or connected in separate, independent loops of the system, each of the scattered terminal units being addressable from a central control panel. The arrangement is such that serial synchronous power transmission and data communication is effectuated over the individual loops of the system. The improvement resides in providing continuity-isolation testing for a Class A wiring scheme involved in the loops. By Class A operation is meant that there are two separate channels involved in each loop. A continuity test is sequentially performed on both channels of the loop such that discontinuities can be precisely located.

REFERENCES:
patent: 4253091 (1981-02-01), Frydman
patent: 4567471 (1986-01-01), Acar
patent: 4742334 (1988-05-01), Teich et al.
patent: 4777473 (1988-10-01), Weston et al.
patent: 4803465 (1989-02-01), Prysby
patent: 4816808 (1989-03-01), Morita

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