The Design of a PDF417This barcode is made of rows that are between 3 to 90 in number. Each row looks like a tiny linear barcode. The rows of a typical PDF417 barcode is described below.
Start CodeThis code is found at the beginning of the barcode. It allows a barcode reading machine to identify a barcode as a PDF417 barcode.
Left Row IndicatorThis is a codeword that contains information regarding each row. This information includes adjustment level and row count.
Data CodewordsThe data codewords range from 1 to 30. The data codewords are described as a collection of spaces and bars, which characterize letters, symbols, and numbers.
Right Row IndicatorThis is another codeword, which also contains information regarding each row. Just like the left row indicator, its information allows for count and adjustment levels.
Start PatternThis pattern is found at the end of the barcode. It allows a barcode reading device to recognize the end of a barcode.
Quiet ZoneThe quiet zone is a necessary minimum white spacing just before a bar code starts. This zone occurs periodically within the barcode.
PDF417 Barcode EncodingThe PDF417 barcode has 929 code words for encoding. Within these, 900 are designed to accommodate data. The remaining 29 code words allow for special activities. A typical example of such activity is switching from one major mode to another. Also, each mode encodes data in a unique pattern.
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