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Principle of non-contact IC card launch

Non-contact IC card with the card reader through radio waves to complete read and write operations. Frequency of communication between the two 13.56MHZ. Non-contact IC card itself is a passive card, when the reader/writer when the card is read and write operations, reader signal formed by the superposition of two parts: one is the power signal, which is set by the card after receiving L/C with itself to produce an instant energy to supply the chip work. Another part is instruction and data signals, commanding chip data to read, modify, store, and return signals to the reader, to complete a read or write operation. Reader generally consists of a single-chip, dedicated intelligent modules and antennas, communication interface and is equipped with PC, printer port, I/O ports, and so on, so as to apply to different areas.