User guide

A795 User Guide: Programming Supplement
Chapter 4: Programming commands
93
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.
(Select PDF 714 parameters—continued on the next page)