Code 128 Barcode Overview
Code 128 is a linear bar code symbol that is widely used in automatic identification applications in the commercial and logistics sectors. It can encode text information containing numbers, letters, and special characters. Code 128 adopts a high-density encoding method, which can realize the representation of long data content on a relatively short barcode.
The Code 128 bar code consists of several alternating black and white stripes, each of which can be of different widths. It contains a start symbol, data content, a check character, and a stop symbol. The start and end symbols are used to identify the start and end positions of the bar code, and the check characters are used to verify the accuracy of the data. The data content can be any combination of characters, including numbers, letters, symbols, and special control characters.
The Code 128 bar code enables high density coding, that is, representing more data within a limited bar code length. It uses three character sets: character set A, character set B, and character set C. Character set A is used to encode uppercase letters, numbers, and some special characters, character set B is used to encode uppercase letters, numbers, and some common symbols, and character set C is used exclusively to encode pure numbers. The selection of different character sets can determine the encoding mode according to the specific application requirements, in order to achieve higher data density and reading efficiency.
Code 128 provides high reliability and fault tolerance. It uses redundancy check codes to detect and correct errors in barcodes, allowing correct identification of data contents even in the event of a certain degree of damage or defacement. At the same time, the Code 128 bar code also supports the extension function of the bar code, which can add additional data on the basis of the standard bar code to meet the needs of more complex applications.
In summary, Code 128 is a commonly used linear barcode symbol that can effectively represent various types of data content through high-density encoding and multiple character set selection. It is widely used in business and logistics, providing a reliable solution for automatic identification and data management.