The normal PDF417 barcode symbol has two row start columns and two row stop columns. Keep in mind when selecting columns, only the number of data columns in the symbol are being selected. However, the PDF417 barcode symbol is limited to 30 columns and 90 rows. The number of rows and columns can be selected, allowing the symbol to be created in various forms.When creating symbols with more than 10 columns, IDAutomation recommends using a ratio of 1:4 or 1:5. Most scanners, such as the IDAutomation PDF417 2D USB Scanner, read PDF417 barcodes well at 1:3. By lowering the ratio, a significant amount of space can be saved however, some scanners cannot read X to Y ratios of less than 1:3. The PDF417 barcode is usually printed at an X to Y ratio of 1:2 to 1:5, with 1:3 being the most popular. The Y dimension is the height of each row within the PDF417 symbol. The X dimension is the width of the narrowest bar in a printed codeword.
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