Radio tag system and method with improved tag interference avoid

Details Radio tag system and method with improved tag interference avoid Radio tag system and method with improved tag interference avoid

1997-01-24

2000-03-07

Tong, Nina

Communications: electrical

Condition responsive indicating system

Specific condition

340928, 34082544, 34082554, 455 313, 370445, 370448, 235384, G08B 1314

Patent

active

060346035

ABSTRACT:
A data transmission system includes a reader transceiver and one or more tag transceivers. The reader transmits an activation signal to a tag. The tag selectively transmits a response signal to the reader at a specific time determined by a detected level of communications channel activity. The detector operates in a low-power standby state until the time it receives the activation signal, and then operates in an active state. The invention further incorporates a technique to maintain an extremely low power state to the tag during quiescent mode while retaining full sensitivity to reader activation signals. The reader transceivers are of a modular architecture with each module operating independently, yet in concert with the others. The modules are interconnected in a media independent method and can interact remotely with other modules.

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