Postal 2 critical error1/31/2023 ![]() Possibly the most serious drawback of Code 39 is its low data density: It requires more space to encode data in Code 39 than, for example, in Code 128. The barcode itself does not contain a check digit (in contrast to-for instance- Code 128), but it can be considered self-checking on the grounds that a single erroneously interpreted bar cannot generate another valid character. The width ratio between narrow and wide is not critical, and may be chosen between 1:2 and 1:3. Three of the nine elements in each character are wide (binary value 1), and six elements are narrow (binary value 0). Each character is composed of nine elements: five bars and four spaces. ![]() ![]() An additional character (denoted '*') is used for both start and stop delimiters. The Code 39 specification defines 43 characters, consisting of uppercase letters (A through Z), numeric digits (0 through 9) and a number of special characters (. ![]() Code 39 (also known as Alpha39, Code 3 of 9, Code 3/9, Type 39, USS Code 39, or USD-3) is a variable length, discrete barcode symbology. ![]()
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