Barcode technology is an automatic identification technology, which is produced and developed in computer applications and practices, and is widely used in commerce, postal services, book management, storage, industrial production process control, transportation and other fields. It combines a variety of blacks with different widths. Arrange bars and blanks according to certain coding rules to express a set of graphical identifiers of information. A common barcode is a parallel line pattern arranged by black bars (bars for short) and white bars (empty for short) with completely different reflectivity. The barcode can mark the country of production, manufacturer, product name, production date, book classification number, start and end position of mail, category, date and many other information. It has the advantages of fast input speed, high precision, low cost and strong reliability. , Occupies an important position in today's automatic identification technology.
RFID electronic tag is a popular name for radio frequency identification (RFID), which consists of three parts: tag, reader, and data transmission and processing system.
Tags are also called electronic tags or smart tags. It is a chip with an antenna in the memory, and the information that can identify the target is stored in the chip. RFID tags have the characteristics of durability, strong penetration of information reception and transmission, large storage capacity and various types of information. Some RFID tags support reading and writing functions, and can update the information of the target object at any time. There are two types of readers: handheld and fixed. It consists of transmitter, receiver, control module and transceiver. The transceiver is connected to the control computer or programmable logic controller (PLC) to realize its communication function. The reader also has an antenna for receiving and sending information. Data transmission and processing system: The reader receives and reads data by receiving radio waves from the tag. The most common is passive radio frequency systems. When the reader encounters an RFID tag, it emits electromagnetic waves and forms an electromagnetic field around it. The tag obtains energy from the electromagnetic field to activate the microchip circuit in the tag. The chip converts electromagnetic waves and sends them to the reader. It will be converted into relevant data. The control calculator can process these data for management control. In the active radio frequency system, the tag is equipped with a battery and can be moved within the effective range