Programmable object identification transponder system
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United States of America Patent
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-
Sep 1, 1992
Issued Date -
N/A
app pub date -
Dec 11, 1991
filing date -
Oct 23, 1987
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system for indenitfying objects, such as workpieces on an assembly line, includes a transponder for attaching to an object and a radio frequency (RF) transceiver. The transceiver can program the transponder with data about the specific object and interrogate the transponder to obtain previously programmed data. The transponder responds to different RF signal strengths and commands from the transceiver to select whether it will store or transmit data. Data is exchanged between the two devices using Manchester encoding. The transceiver processes the encoded data signal from the transponder by measuring and storing the intervals between level transitions in the signal. The stored intervals are then processed in non-real time to recover the data.
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