The basic working principle of RFID technology is that after the tag enters the magnetic field, it receives the RF signal sent by the reader and sends the product information stored in the chip with the energy obtained by the induced current; The scanning of bar code needs a scanner. The scanner uses its own light source to illuminate the bar code, and then uses a photoelectric converter to receive the reflected light and convert the brightness of the reflected light into a digital signal.

2. Different definitions:

RFID technology is a communication technology, which can identify a specific target and read and write related data through radio signals without establishing mechanical or optical contact between the identification system and the specific target. Bar code is a graphic identifier that arranges a number of black bars and blanks with different widths according to certain coding rules to express a group of information.

3. Different usability:

The most important advantage of RFID system is non-contact identification. It can read labels through the harsh environment where snow, fog, ice, paint, dirt and bar codes cannot be used, and the reading speed is extremely fast. Barcode can indicate the country of production, manufacturer, commodity name, date of production, book classification number, mailing place, category, date and many other information.