Code 128 is a versatile and widely used barcode system that encodes the full 128 ASCII character set. Its design includes a series of bars and spaces that represent different alphanumeric characters and control codes. The structure of a Code 128 barcode is composed of a start character, encoded data, a check character for error detection, and a stop character. This system allows for three different character sets, enabling it to compactly encode information in a smaller space compared to other barcode types.

The extended version of Code 128, known as ISS Code 128, includes features that allow the encoding of additional characters, such as those used in non-English languages. This is achieved through the use of an extension symbol, which expands the encoding capabilities of the barcode. Code 128 barcodes are used in various industries for tracking and managing goods, and their design makes them particularly useful for applications that require the encoding of extensive data or special characters.

The encoding process for Code 128 barcodes is complex, involving the selection of the appropriate character set and the calculation of a check digit based on a weighted sum of the data. This ensures the accuracy and integrity of the encoded information. The barcode's high-density data encoding capability makes it an efficient choice for many businesses, providing a reliable way to encode and read a wide range of data quickly and accurately.

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