System for transmitting alarm signals with a repetition

Details System for transmitting alarm signals with a repetition System for transmitting alarm signals with a repetition

1991-03-14

1992-11-17

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, G08B 108

Patent

active

051647044

ABSTRACT:
System for transmitting alarm signals, comprising at least one portable transmitting unit and one central receiver, the transmitting unit comprising a control circuit which is connected to an activation device and a transmitting circuit, the control circuit activating the transmitting circuit when the activation device is energized in order to transmit an alarm signal and in order to re-activate the transmitting circuit for the re-transmission of the alarm signal after the elapse of a delay time, the delay time being different from a delay time of another transmitting unit, the transmitting unit having a memory for storing an identification code allocated to the transmitting unit, the central receiver comprising a processing system which is connected to a receiving circuit which is suitable for receiving an alarm signal and the processing circuit activating a signalling device, on receipt of an alarm signal, for the purpose of generating an attention signal, in which system the delay time is dependent on corresponding sections having different values of identification codes allocated to a predetermined group of transmitting units.

REFERENCES:
patent: 3623876 (1986-11-01), Shima et al.
patent: 4101872 (1978-07-01), Pappas
patent: 4347501 (1982-08-01), Akerberg
patent: 4442426 (1984-04-01), Heuschmann et al.
patent: 4462022 (1984-07-01), Stolarczyk
patent: 4661804 (1987-04-01), Abel
patent: 4734680 (1988-03-01), Gehman et al.
patent: 5004999 (1991-04-01), Hartmann et al.

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