Security alarm system

Details Security alarm system Security alarm system

1979-07-02

1981-06-16

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340508, 340518, 340531, 340533, 340537, 307 10AT, 324 66, 339198R, 174112, 1791753A, G08B 2300, G08B 1700

Patent

active

042740860

ABSTRACT:
In an alarm system, differently colored leads of the connection cable between the individual distributors are respectively assigned to different current paths according to a random sequence. By providing this association, targeted manipulations at the connection lines of the signal lines are prevented.

REFERENCES:
patent: 2106048 (1938-01-01), Candy
patent: 2945204 (1960-07-01), Berger
patent: 3404393 (1968-10-01), Blivice et al.
patent: 3644927 (1972-02-01), Green
patent: 3988724 (1976-10-01), Anderson
patent: 4032916 (1977-06-01), Galvin et al.
patent: 4161727 (1979-07-01), Thilo et al.
patent: 4162489 (1979-07-01), Thilo et al.

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