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The reader sends a radio frequency signal of a certain frequency through the transmitting antenna. When the radio frequency card enters the working area of the transmitting antenna, an induced current is generated, and the radio frequency card obtains energy and is activated; the radio frequency card sends out its own encoding and other information through the built-in transmitting antenna of the card; the system receiving antenna After receiving the carrier signal sent from the radio frequency card, it is transmitted to the reader via the antenna adjuster. The reader demodulates and decodes the received signal and then sends it to the background main system for related processing; the main system judges the card’s performance based on logic operations Legality, corresponding processing and control are made for different settings, and command signals are issued to control the action of the actuator.
In terms of coupling method (inductance-electromagnetic), communication process (FDX, HDX, SEQ), data transmission method from radio frequency card to reader (load modulation, backscatter, high-order harmonics), and frequency range, there are different There are fundamental differences in non-contact transmission methods, but all readers are very similar in functional principles and the design and construction determined by this. All readers can be simplified into two basic modules, high-frequency interface and control unit. The high-frequency interface includes a transmitter and a receiver, and its functions include: generating high-frequency transmission power to activate the radio frequency card and provide energy; modulating the transmitted signal to transmit data to the radio frequency card; receiving and demodulating the data from the radio frequency card High frequency signal.
1. The RFID reader/writer transmits the radio carrier signal through the transmitting antenna.
2. When the RFID electronic tag enters the working area of the transmitting antenna, the electronic tag is activated and transmits the code of its own information through the antenna.
3. The receiving antenna of the RFID system receives the carrier signal sent by the electronic tag, and transmits it to the RFID reader through the regulator of the antenna. The reader demodulates and decodes the received signal and sends it to the background computer control system.
4. The computer control system judges the legitimacy of the electronic tag according to logical operations, makes corresponding processing and control for different settings, and sends out instruction signals to control the actions of the actuator.
5. The actuator acts in accordance with the instructions of the computer system.
6. Connect various monitoring points through a computer communication network to form a general control information platform, and design different software according to different projects to complete the functions to be realized.
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