Communication system capable of broadcast messaging and transpon

Details Communication system capable of broadcast messaging and transpon Communication system capable of broadcast messaging and transpon

1991-05-07

1993-03-16

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

With particular system function

340518, 34082506, 34082508, 34082554, G08G 2600

Patent

active

051948460

ABSTRACT:
A communication system in which a controller is coupled over a communication path with two or more transponders, at least two of which transponders have different addresses, which controller and transponders communicate by periodically transmitting a broadcast message simultaneously to all transponders, transmitting an acknowledge message indicative of a new input received by at least one of the transponders, and individually polling all of the transponders using a polling technique which incorporates time periods to allow communication between the controller and a selected transponder, wherein the polling is only activated subsequent to the transmission of the acknowledge message. Periodic polls of all transponders in sequence provide supervision of the integrity of the system.

REFERENCES:
patent: 4507652 (1985-03-01), Vogt et al.
patent: 4614945 (1986-09-01), Brunius et al.
patent: 4742335 (1988-05-01), Vogt

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