Chapter 5: Programming commands  105

Select PDF 417 parameters

ASCII

GS p a b c d e f

Hexadecimal

1D 70 a b c d e f

Decimal

29 112 a b c d e f

Value and Ranges:

Value:

 

 

Ranges:

Description:

 

 

 

 

 

a, b =

 

 

 

The ratio of bar height to symbol length.

a =

height

 

limit 1 to 10

 

b =

width

 

limit 1 to 100

 

c =

rows

 

limit 3 to 90

Number of rows in the matrix of code words.

d =

columns

limit 7 to 30

Number of columns in the matrix of code words.

e =

x dimension

limit 1 to 7

Width of a single module in dots.

f =

y dimension

limit 2 to 25

Height of the code word in dots.

Defaults:

a = 1

 

 

 

 

b = 2

 

 

 

 

c = 58

 

 

 

 

d = 7

 

 

 

 

e = 3

 

 

 

 

f = 10

 

 

PDF 417 is a multi-row, continuous, variable length symbology which has high data capacity. Each symbol has between 3 and 90 rows, with each row containing a start pattern, a left row indicator, 1 to 30 data characters, a right row indicator and a stop pattern. The number and length of the rows are selectable, which allows the aspect ratio to be adjusted to particular labeling applications. There are no separator bars between rows.

Each character has four bars and four spaces within 17 modules, and is assigned a value between 0 and 928. For this symbology, it is common to refer to these character values as “code words.”

There are three mutually exclusive sets of symbol patterns, or clusters, each having 929 distinct patterns. Because different clusters are used for adjacent rows, it is possible for the decoder to tell if the scanning path is crossing row boundaries without the use of separator bars.

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:

1 Leading quiet zone

2 Start pattern

3Left row indicator characters (code words)

4 One to thirty data characters (code words) 5 Right row indicator character (code words) 6 Stop pattern 7 Trailing quiet zone

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.

Continued . . .

A776-PG00001 C 12/09

A776 (B780) Programming Guide

Page 117
Image 117
Cognitive Solutions A776, B780 manual Sample symbol description, Programming commands 105, GS p a b c d e f, Defaults

B780, A776 specifications

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