Intruder alarm system

Details Intruder alarm system Intruder alarm system

1983-02-22

1987-03-17

Rowland, James L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340506, G08B 2900

Patent

active

046511385

ABSTRACT:
An intruder alarm system includes a number of sensors each of which comprises first and second series-connected resistances and a sensor switch connected in parallel with the first resistance. The first resistances of each sensor are different in value from one another, but their values are related in a known manner. The sensors are connected in series with one another by a connecting cable and to a constant current source. The voltage developed across the series-connected sensors is applied to a circuit arrangement operable to offset the effect of the total resistance of the second resistances of each sensor and of the connecting cable. An analogue-to-digital converter is responsive to the output of the circuit arrangement to deliver a digital output to an indicator which indicates the actuation of any sensor.

REFERENCES:
patent: 3588890 (1971-06-01), Cox et al.
patent: 3646552 (1972-02-01), Fuhr
patent: 3829850 (1974-08-01), Guetersloh
patent: 3866202 (1975-02-01), Reiss et al.
patent: 4028057 (1977-06-01), Nelson
patent: 4339746 (1982-07-01), Ulicki et al.
patent: 4348661 (1982-09-01), Lucchesi
patent: 4441100 (1984-04-01), Galloway
patent: 4491828 (1985-01-01), Galvin et al.
patent: 4524349 (1985-06-01), Hyatt

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