Line monitor for two wire data transmission

Details Line monitor for two wire data transmission Line monitor for two wire data transmission

1995-05-16

1997-09-23

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340537, 340660, 3408255, 364138, 364188, G08B 2900

Patent

active

056709374

ABSTRACT:
A line monitor uses two wire data transmission in a fire alarm and detection system. A line voltage monitoring mechanism is within each wiring/contact monitoring circuit such that the exact value at any time of varying source voltage is known. The monitoring current resultant from the monitoring arrangement is strictly a function of impedance and not a function of source voltage because a line-monitoring scaling factor is incorporated into the final calculation. The monitoring scheme also results in the alarm and trouble voltage thresholds being suitably altered to take account of changed line voltage conditions.

REFERENCES:
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patent: 4954809 (1990-09-01), Right et al.
patent: 4962368 (1990-10-01), Dobrzanski et al.
patent: 5017905 (1991-05-01), Yuchi
patent: 5117219 (1992-05-01), Tice et al.
patent: 5267180 (1993-11-01), Okayama
patent: 5298223 (1994-03-01), Berger et al.
patent: 5347515 (1994-09-01), Marino
patent: 5351034 (1994-09-01), Berger et al.
patent: 5398025 (1995-03-01), Herman

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