The basic working principle of RFID technology is not complicated: after the tag enters the reader, it receives the radio frequency signal sent by the reader, and uses the energy obtained by the induced current to send out the product information stored in the chip ( Passive Tag , passive tag or passive tag) ), or the tag actively sends a signal of a certain frequency (Active Tag, active tag or active tag), the reader reads and decodes the information, and then sends it to the central information system for relevant data processing.
A complete RFID system, a reader and tag by a so-called three part transponder system and application software, and its working principle is the reader (Reader ) transmit a specific frequency radio wave energy, for The drive circuit sends out the internal data. At this time, the Reader receives and interprets the data in sequence and sends them to the application program for corresponding processing.
From the perspective of the communication and energy sensing methods between the RFID card reader and the electronic tag, it can be roughly divided into two types: inductive coupling and backscatter coupling. Generally, low-frequency RFID mostly adopts the first method, and high-frequency RFID mostly adopts the second method.
The reader can be a read or read/write device depending on the structure and technology used, and it is the information control and processing center of the RFID system . The reader usually consists of a coupling module, a transceiver module, a control module and an interface unit. The reader and the tag generally adopt a half-duplex communication mode for information exchange, and the reader provides energy and timing to the passive tag through coupling. In practical applications, management functions such as the collection, processing and remote transmission of object identification information can be further realized through Ethernet or WLAN.
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