All elements of the same type should be printed the same size. Depending upon which resolution has been used for the printing of the bar code, the width of the wide element should be at least two times greater than the narrow element. To enable a decoder to distinguish between the wide and narrow elements a minimum wide to narrow ratio is needed. The character set table shows each of the available characters with their corresponding check character values. Wide elements represent binary ones (1), and narrow elements represent binary zeros (0). Of these nine elements, two of the bars and one of the spaces are wider than the rest. * $ / % + Code 39 characters are constructed using nine elements, five bars and four spaces. Here as some of the most common used bar codes:Ĭode 39 is an alphanumeric bar code that can encode decimal numbers, the upper case alphabet, and the following special symbols: _. Barcodes can be divided by classes (linear or 2D), by industry (manufacturing, pharmaceutical, Publishing) or by usage (inventory tracking, packaging, serial number). There are many different types of barcode.
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