Trovan passive transponder systems are designed to work where conventional ID technologies will not work. No more bar code limitations.
   
the reader excites the transponder inductively by means of a polarized low-freqency electromagnetic field reliable interference-free contactless transmission is assured via phase modulation and a special process for error checking and correction (PSK-phase shift keying 180 degrees each for logic one and logic zero)
reader emits a magnetic field, when a transponder passes through the field its antenna is energized
Chip immediately begins to send its ID code back to the reader, in the reader receiver coils sense the minute transponder signal, transponder's digital code is displayed on the reader's LCD and can be saved in memory

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