Surveillance system

Details Surveillance system Surveillance system

1975-11-25

1977-11-01

Cooper, William C.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340413, H04M 1104

Patent

active

040566846

ABSTRACT:
A surveillance system comprises a central unit connected, by the intermediary of a communication channel, to a plurality of local terminal units in order to receive information from these units concerning changes of status in sensors connected to the terminal units. Each terminal unit comprises a transfer blocking register with a memory cell for each sensor in at least one group of the sensors connected to the terminal unit. These memory cells have two states and are switchable between these states by control information transferred from the central unit. Moreover, a sensing device is provided for achieving, on a change of status in any one of the sensors of the group, transfer of information on such change to the central unit only when the corresponding memory cell in the transfer blocking register is in one of its two states.

REFERENCES:
patent: 3073907 (1963-01-01), Alterman et al.
patent: 3347992 (1967-10-01), Von Sanden et al.
patent: 3576399 (1971-04-01), Schweitzer et al
patent: 3715515 (1973-02-01), Stirling et al.
patent: 3882278 (1975-05-01), Coll
patent: 3894191 (1975-07-01), Sassa

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