Electronic communication system between a base station and trans

Details Electronic communication system between a base station and trans Electronic communication system between a base station and trans

1999-01-22

2000-11-21

Pope, Daryl

Communications: electrical

Condition responsive indicating system

With particular system function

3405721, 3405731, 340 101, G08B 2600

Patent

active

061509345

ABSTRACT:
A communication system comprising a base station (20) and a plurality of transponders (TR; 21 to 26), the base station (20) emitting an electromagnetic field (1) defining a communication volume (2) in which several transponders (21, 22, 23) are susceptible to be situated. The transponders are adapted to generate identification messages (30) in response to the electromagnetic field (1). The base station (20) is adapted to selectively communicate with each transponder by generating communication initiation signals (40) in response to the identification messages (30). Each transponder is adapted to open a communication window (60) in response to a communication initiation signal (40) during which information may be exchanged and/or commands may be sent.

REFERENCES:
patent: 5365551 (1994-11-01), Snodgraa et al.
patent: 5838235 (1998-11-01), Thorigne

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