Printronix L7032 Programmer's Reference Manual page 214

Chapter 3
Bar Codes
Quiet Zone
Both ends of the bar code structure have blank quiet zones. The quiet zones
should be at least 0.25 inches wide and completely blank to ensure accurate
reading of the start/stop codes and to prevent adjacent bar codes from
overlapping. You are responsible for providing sufficient space on the form for
the quiet zones. A trailing quiet zone is provided automatically if an add-on
code has been specified in the bar code command.
Start/Center/Stop Codes
The Start/Center/Stop codes are special character codes marking those
portions of the bar code. These codes are automatically produced with each
bar code.
Data Field
The bar code symbol uses a series of varying width bars and spaces to
represent a limited numeric character set (numbers 0-9 and Special
Characters Start, Center, and Stop). The bars and spaces vary in width from 1
through 4 modules. Each character consists of 2 bars and 2 spaces that total
7 modules. The symbol coding of the left data field is different from the right
data field to permit read direction sensing.
Readable Data
The human readable data field provides a readable interpretation of the bar
code data. Bar code data is printed below the horizontal bar code symbol, and
to the left of a vertical bar code symbol.
Check Digit
The modulo-10 check digit is automatically calculated and inserted in the bar
code symbol. The check digit provides the means to verify accurate scanning.
EAN 8 Command Format
NOTE: See page 164 for the IBARC, command format and definitions.
Default Ratio:
Variable Ratio:
214
(cc) dir p type data (cc)G
(cc) dir p [9] [:] type [ ratio ] data (cc)G
(cc) Represents the Special Function Control Code
(SFCC). Enter the specific SFCC for your VGL
configuration.
dir Represents the direction of the bar code. Enter B
for horizontal bar codes; enter C for vertical bar
codes.