A scanner seeing the reverse stop symbol then knows it must skip the 2-module bar and read the rest of the barcode in reverse.ĭespite its name, Code 128 does not have 128 distinct symbols, so it cannot represent 128 code points directly. When the stop pattern is read right-to-left, the reverse stop symbol (followed by a 2-module bar) is recognized. When the stop pattern is read left-to-right (the usual case), the stop symbol (followed by a 2-module bar) is recognized. The stop pattern permits bidirectional scanning. ![]() The stop pattern is composed of two overlapped symbols and has four bars. Each bar and space is 1 to 4 modules wide, and the symbols are fixed width: the sum of the widths of the three black bars and three white bars is 11 modules. ![]() All widths are multiples of a basic "module". Each symbol consists of three black bars and three white spaces of varying widths. The check symbol is calculated from a weighted sum ( modulo 103) of all the symbols.Ĭode 128 includes 108 symbols: 103 data symbols, 3 start symbols, and 2 stop symbols. ![]() Final bar (often considered part of the stop symbol).1:quiet zone, 2:start code, 3:data, 4:checksum, 5:stop code
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |