Monitoring system for a direct-wire alarm system

Details Monitoring system for a direct-wire alarm system Monitoring system for a direct-wire alarm system

1979-10-01

1981-08-11

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340508, 340511, 340518, 340661, G08B 2900, G08C 900

Patent

active

042837170

ABSTRACT:
A direct-wire alarm system for scanning and monitoring a plurality of security alarm systems located in various user's facilities. The device monitors each line sequentially and converts current levels present on each line to a digital value. A digital filter is utilized to eliminate periodic line noise while a second digital filter is utilized to eliminate pulse noise. The system further comprises a line ringing system for notifying the user of a line condition and an adjustable comparator for obtaining high resolution of line current values.

REFERENCES:
patent: 3219991 (1965-11-01), Freitas
patent: 3431557 (1969-03-01), Thomas et al.
patent: 3534353 (1970-10-01), Calkin et al.
patent: 3786501 (1974-01-01), Marnerakis
patent: 4103337 (1978-07-01), Whiteside

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