The principle of PDF standard card is radio frequency identification technology, which is a non-contact automatic identification technology realized by radio frequency communication technology. Compared with traditional contact identification technologies such as bar code and magnetic card, radio frequency identification technology can realize invisible and multi-target identification, and has the advantages of waterproof, antimagnetic, long service life, large capacity, no mechanical loss, information encryption and changeable content.

Nowadays, RFID technology has been widely used in people's daily life, such as public transportation, access control management, second-generation ID card, public food and drug hygiene management and so on. Some contactless cards that are often seen are the application of RFID technology.

Extended data

The working frequency range of RFID read-write card is 10~ 15MHz, and the working frequency is usually 13.56MHz. There are usually two working sequences of reader and electronic tag: one is the reader speaks first (RTF) and the other is the tag speaks first (TTF). RTF mode: the electronic tag only sends data when it receives a special command from the reader.

The electronic tag enters the reader's energy field and actively sends its serial number. TTF radio frequency tag has the characteristics of fast identification and is suitable for high-speed applications. In addition, TTF mode is more robust in noise environment and more practical in dealing with the dynamic change of tag numbers, so it is more suitable for tracking and tracking applications in industrial environment.

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