Method for communication with multiple transponders
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United States of America Patent
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N/A
Issued Date -
Dec 5, 2002
app pub date -
Mar 1, 2002
filing date -
Mar 5, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for communication with multiple transponders, particularly for reading digital information from transponders. The information being different in every transponder, as may be a chip serial number (S/N), is transmitted by the transponders using the same response channel for all transponders in such a way that possible states of a digital information per digit are transmitted during different windows in time for every digit position using a type of modulation (e.g. ASK, FSK, PSK). Each window is associated to a possible state of a digit position. In one embodiment some of the windows are associated to a predetermined state corresponding to no modulation for reference.
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