Radio alarm system

Details Radio alarm system Radio alarm system

1990-12-20

1992-09-15

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, 455 341, G08B 108

Patent

active

051481480

ABSTRACT:
A radio alarm system for detecting abnormalities such as a fire having a central unit which is adapted to receive and decode the radio signal transmitted from each terminal device and to give an alarm and a plurality of terminal devices which is connected to a detector for detecting an abnormal state and is adapted to transmit information in the form of a radio signal based on an abnormality detection signal from the respective associated detector. And delay times which vary from terminal device to terminal device are set, and the selection of a free channel for transmission is effected in each terminal device by performing carrier sensing over a delay time peculiar to that terminal device. Each of the terminal devices is equipped with a channel setting means which successively performs, when transmitting information, carrier sensing on a plurality of transmission channels previously allocated the terminal device, in a previously determined order, thereby selecting a free channel which is not being used by an other terminal device.

REFERENCES:
patent: 4477799 (1984-10-01), Rocci et al.
patent: 4499455 (1985-02-01), Leveille et al.
patent: 4628537 (1986-12-01), Shimakata et al.
patent: 4792984 (1988-12-01), Matsuo
patent: 4903322 (1990-02-01), Inahara et al.

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