One-dimensional bar code consists of a group of bars and empty symbols arranged according to certain rules.

Can represent characters, numbers, symbols and other information; There are about twenty common ones, such as EAN- 13, Code39, UPC-A, etc.

EAN series: ean international general commodity bar code;

UPC series: Uniform Code Committee of the United States. One-dimensional bar codes, which are popular in the United States, consist of a set of bars and blank symbols arranged according to specific rules. Can represent characters, numbers, symbols and other information; There are about twenty common ones: such as EAN- 13, Code39, UPC-A, etc. EAN series: ean international general commodity bar code;

UPC series: American Uniform Code Committee, popular in the United States and Canada;

Code39: complete structural design, with certain error correction ability, widely used in industry, books and tickets;

Codebar: used in medical, logistics and other industries;

QR code

Because of the limited capacity of one-dimensional code, most applications need database support; Then, for this reason, on the basis of one-dimensional code theory, two-dimensional code appeared in the 1990s. QR codes can store not only numbers, but also pictures, sounds, fingerprints and other information.

Common QR codes include QR code, PDF4 17 code, DataMatrix code, Maxicode code, DESOFT code and so on.

QR code: Invented by Denso Corporation of Japan, it is widely used because it can store Chinese characters and quickly identify them.

PDF4 17: Invented the American symbol (now Motorola), which was widely used by American companies;

DataMatrix: Invented by American IDMatrix, its performance is better than PDF4 17.

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Traceability from Guangzhou: Internet of Things, enterprise mobile application, traceability, barcode &RFID.