HP LineJet Printers - QMS Code V Technical Reference Manual, 171251-001PX

148
Chapter 3 Bar Codes
If the : parameter is specified, the ratios are
represented in printer dots instead of Code V dots
(60 x 72 dpi).
type Selects the bar code type. Code 39 types available
are shown in Table 22. Enter the Type Code
corresponding to the Code 39 type desired.
[ratio] Optional parameter (used in conjunction with
parameter 9) representing the ratios for variable
ratio bar codes. The default ratios are overridden
by the variable ratio feature. The ratio data must be
hexadecimal numbers from 0 through 9 or A
through F. The Code V automatically checks the
input for validity. If an invalid character is found in
the ratio, an error message is generated.
Code 39 bar codes use four-digit ratios. The ratios
are interpreted from left to right, measuring the size
of each bar or space, in dot width according to the
following pattern:
narrow bar : narrow space : wide
bar : wide space
. For example, enter 2266 in the
ratio parameter for:
2 dot-wide narrow bar
2 dot-wide narrow space
6 dot-wide wide bar
6 dot-wide wide space.
The Code V automatically checks ratio data for validity only within the
allowable hexadecimal range. The Code V does not verify that ratio data
creates acceptable wide/narrow element relationships for bar code
readability. For example, the Code V accepts wide/narrow ratio values of 2
and 5, respectively; however a narrow element larger than the wide element
produces an unreadable bar code. When designing unique ratio data,
carefully plot wide and narrow ratios to conform to readable bar codes.
Table 22. Code 39 Bar Codes
Standard
Type Code
IBARC,
Type Code
# of Data
Characters
Check
Digits
Default Bar/
Space Ratios*
Ratio
A C39 1-40 None 1:1:3:3 1:3
B C39A 1-40 None 1:2:4:5 1:3
C C39M43 1-40 Mod 43 1:1:3:3 1:3
LOGMAR 1-40 None 1:1:3:3
HIBCC 1-40 Mod 43 1:1:3:3
AIAG 1-40 None 1:1:3:3
EMBARC 1-40 None 1:1:3:3
* Ratios represent dot width of the bar/space elements as follows:
Narrow Bar : Narrow Space : Wide Bar : Wide Space.