Brief introduction of barcode coding method (code system)

There are many kinds of barcodes, and there are about twenty kinds of common code systems, including:

Code39 code (standard 39 code), Codabar code (Kudaba code), Code25 code (standard 25 code), ITF25 code (cross code 25 code), Matrix25 code (matrix code 25 code), UPC-A code, UPC-E code , EAN-13 code (EAN-13 international product bar code), EAN-8 code (EAN-8 international product bar code), China Post code (a variant of the matrix 25 code), Code-B code, MSI code, Codes such as Code11, Code93, ISBN, ISSN, Code128 (Code128, including EAN128), Code39EMS (39-code for EMS), and other two-dimensional barcodes such as PDF417.

At present, the internationally widely used bar code types are EAN and UPC codes (product bar codes, which are used to uniquely identify a product in the world. The most common ones in supermarkets are such bar codes) and Code 39 codes (which can represent numbers and letters. , The most widely used in the field of management), ITF25 code (more used in logistics management), Codebar code (used in medical, books), Code93 code, Code128 code, and so on. Among them, the EAN code is a widely used commodity bar code in the world and has become the basis of electronic data interchange (EDI); UPC code is mainly used by the United States and Canada; in various bar code application systems, Code39 code can be used for digital The combination of letters and letters is widely used in internal management of various industries; in the services of blood banks, libraries, and photo studios, Codebar codes are also widely used.