 A linear, or 1D, bar code is the most common type of bar code. Data is encoded in the relative widths of bars and spaces. The style of encoding bar and space widths into character patterns determines the type of symbology.There are many linear bar code symbologies, such as Code 39, UPC/EAN and Code 128. Those linear symbologies which encode data in character patterns that are made up of bars and spaces of only two widths are known as binary symbologies. Binary symbologies use only “wide” and “narrow” elements. The ratio between wide and narrow elements can be chosen when creating a binary symbology. Binary symbologies include: Code 39, Codabar, Interleaved 2 of 5 (I25). Another type of linear symbology is “Modular” Symbologies, and these include Code 128, UPC/EAN, GS1-DataBar, PDF 417, and many others. Modular symbologies can encode data in less space because character patterns are made up of bars and spaces that can be a larger number of relative widths, usually 1, 2, 3 or 4 modules wide (although in some symbologies bars and spaces can be even wider). In both types of linear symbologies, characters generally have a fixed width, which enables the bar code character to be decoded with reference only to itself. This property is called “self clocking” and generally makes a bar code “line scannable”. Webscan linear verifiers can be used for: |
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