Article identifying system

摘要

An article identifying system comprises an ID device attached to an article to be identified and a write/read control apparatus to write and read data into and from the ID device. The control apparatus has an oscillator. The ID device has a resonance circuit. Data transmission is performed by the electromagnetic coupling of the oscillator and resonance circuit. The FSK modulation/demodulation are used in this data transmission. Preferably data is encoded by bi-phase code, f/2f code, bipolar code, or dicode code. An electric power can be also supplied from the control apparatus to the ID device by the continuous oscillation of the oscillator.