![]() This is performed by the respective barcode software to minimize the size of the code. When using a Code 128 barcode font in Excel or similar applications, the start and stop characters will be mapped to certain character positions however, the mapping is not standardized and will vary from font to font.Ĭode 128 A start character (bitpattern/widths: 211412, bar-gap-bar-gap-bar-gap, widths add up to 11):Ĭode 128 B start character (widths: 211214):Ĭode 128 C start character (widths: 211232):Ĭode 128 stop character (widths: 311123): Code 128 AutoĬode 128 Auto refers to the automatic selection of the 128 subtype depending on the encoded data. Usually the sub type selection and switching within a symbol is handled by the barcode software thatįor reference we are including the bar patterns of the three start- and the single stop-character here. The code set to use is indicated to the scanner by the start symbol or start character.Īlso available are various mode switching or shift characters to switch from one set to another within a barcode symbol. The code sets differ in compactness and encodable character set.Ĭode 128 A: Partial ASCII set, no lower case, but ASCII control chars (TAB, CR/LF etc.)Ĭode 128 B: Full ASCII set, no ASCII control charsĬode 128 C: Only digits 0-9, encoded in pairs, very compact code Three different code sets or sub types are defined for Code 128 (namely Code 128 A, Code 128 B, and Code 128 C) that determine how the code is interpreted by the barcode scanner. Code 128 code sets A, B, C and start characters As the code is rather old, the Code 128 specs are freely available online, for example in the Wikipedia article on Code 128.
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