104 Chapter 4: Programming Commands

Revision D 12/09

Sample symbol description:

Each PDF 417 symbol consists of 3 to 90 stacked rows surrounded on all four sides by a quiet zone. Each row contains:

1Leading quiet zone

2Start pattern

3Left row indicator characters (code words)

4One to thirty data characters (code words)

5Right row indicator character (code words)

6Stop pattern

7Trailing quiet zone

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�����������������������

������������

������������������

�������������������

����������

����������

�����

�����

�����

�����

�����

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The number of characters in a row and number of rows can be adjusted to vary the symbol’s overall aspect ratio to best fit an available space.

Each row has a left and right row indicator with a data region between. The left-most character in the top row of the data region is the total number of characters in the data region, excluding error correction characters. Characters within the data region are designed to be read from left to right, starting on the top row, immediately after the length-defining character. The maximum characters in the data region are 928.

Related Information:

The “Set bar code width” command (1D 77 n) affects the x dimension and row height for PDF 417. See chart below.

n value

x dimension

row height

2

2

7

3

3

10

4

4

13

5

5

17

6

6

20

Select bar code width

ASCII

GS w n

Hexadecimal

1D 77 n

Decimal

29 119 n

Value of n:

2, 3, 4, 5, 6

Default:

n=3

Sets the bar code width to n dots.

Formulas

n/8mm (n/203 inch)

A799-PG00001D

Page 104
Image 104
Cognitive Solutions A799 Sample symbol description, Select bar code width, Related Information Value Dimension Row height