Printronix l7032 Verweishandbuch

 278

The UPC-A bar code can be printed with or without a 2- or 5-digit add-on data 
field, which is placed at the end of the bar code. The UPC-A bar code 
structure is shown in Figure 24 and described on the following pages.

Quiet zones extend on both ends of the bar code to permit the scan to begin 
and end in a blank area. You are responsible for providing sufficient space on 
the form (minimum of 7 modules) for the right quiet zone. (A trailing quiet zone 
is provided automatically if an add-on code has been specified in the bar code 
command.) The number system character is printed automatically in the left 
quiet zone; the check digit is printed automatically in the right quiet zone. 

QUIET

ZONE

START CODE

CENTER CODE

CHECK DIGIT FIELD

STOP CODE

LEFT DATA

FIELD

RIGHT DATA

FIELD

HEIGHT

QUIET

ZONE

OPTIONAL READABLE

STARTING

POSITION

N

NUMBER 
SYSTEM
CHARACTER

C

CHECK DIGIT
CHARACTER

NUMBER SYSTEM
CHARACTER FIELD

DATA FIELD

2- or 5-

DIGIT

ADD-ON

CODE

QUIET
ZONE

CHECK
DIGIT

LEFT

DATA
FIELD

CENTER CODE

RIGHT

DATA
FIELD

QUIET
ZONE

STOP CODE

HEIGHT

STARTING

FIELD

START CODE

NUMBER

SYSTEM

CHARACTER

N

NUMBER SYSTEM

CHARACTER FIELD

C

CHECK

DIGIT

CHARACTER

POSITION

OPTIONAL

READABLE

DATA

FIELD

2- OR 5- 
DIGIT ADD-
ON CODE