CODE 128 —This high-density code is widely used in many industries;
in fact, it is replacing Interleaved 2 of 5 which can mis-scan if bearer bars
are not used. Code 128 is alphanumeric, can be of variable length and is scanned
bidirectionally. It can encode the entire 128 ASCII character set plus four non-data
characters. Numeric data can be represented in a double-density mode. It uses
less space to encode six characters than any other linear technology. The symbol
includes a quiet zone (10 X-dimensions), a start character, the encoded data,
a check character, the stop character, and a trailing quiet zone (10 X-dimensions).
Each data character encoded in a Code 128 symbol is composed of 11 black or white
modules. The stop character is made up of 13 modules. Three bars and three spaces
are formed out of these 11 modules. Bar and spaces can vary between one and four
modules wide. A special start code pattern designates when the symbol complies
with UCC/EAN system standards. |
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