Canon MF820Cdn User's Guide download pdf (Page 50)

Bar Code Usages and Formats

3-29

Bar Code Symbols and Formats

PDF-417

The PDF-417 bar code is a high-density, 2D bar code created by Symbol Technology, and is

an ANSI/AIM USA standard. This bar code consists of a stack of rows with small black

rectangles arranged in columns. The number of rows and columns can be user defined or set

automatically to fit a ratio (2:3 is the most common ratio).

PDF-417 features built-in error correction capability, automatic data compression, and full

ASCII and binary character sets. It can encode up to 1,848 characters per bar code based

on the compression level achieved.

PDF-417 supports two encoding modes: ASCII (letters, punctuation, and digits), and Binary

(any binary value between 0 and 244). The ASCII mode has a better data density than the

binary mode (maximum 106 versus 177 bytes per cm

), and can encode more data

(maximum 1,848 bytes versus 1,108 bytes). The Bar Code Printing function automatically

selects the best encoding mode (Binary or ASCII) for the supplied data.

PDF-417 bar codes are read by a laser scanner and CCD (Charge Coupled Device)

cameras.

Number of rows (min/max): 3/90

Number of columns (min/max): 1/30

There are many symbol options for the PDF-417 bar code that are activated using the p

parameters of the PCL escape sequence.

NOTE

•

The number of rows multiplied by the number of columns must be less than 929.

•

For more information on using the p parameter escape code in the PDF-417 bar code, see "Font

Parameters," on p. 3-2.

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Canon MF820Cdn User's Guide Page 50