The principle of making high-end access control ID card access control ID card

Two, ID cards working principle of the system by the card reader and background controllers (see Diagram). It works as follows: (1) the reader send out a carrier signal via an antenna; after (2) ID card to enter the working area of ??the reader, the ID card of the inductor and capacitor resonant circuit consisting of receiving reader launch carrier signal, ID cards in chip RF interface module thus signal to produce a power supply voltage, the reset signal and the system clock, the chip "activate"; (3) ID card chip control module reads the data memory via PM coded modulation on a carrier, the ID card back to the reader antenna; (4) the received ID card reader loopback signal demodulation, decoding computer to the background; (5) according to background computer ID card legitimacy, make the appropriate treatment and control for different applications.