Printronix l7032 参照マニュアル

 191

The Code 93 structure is shown in Figure 8 and described on the following 
pages.

Both ends of the bar code structure require 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.

The start/stop code is a unique character identifying the leading and trailing 
end of the bar code. The start/stop code is automatically produced with each 
bar code. The start/stop code structure permits bidirectional bar code 
scanning.

The bar code symbol uses a series of varying width bars and spaces to 
represent the full ASCII character set. Bars and spaces vary in width from 1 
through 4 modules. Each character consists of 2 bars and two 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.

DATA FIELD

QUIET

QUIET START

STOP

LOWER GUARD BAND

CODE

CODE

ZONE

ZONE

OPTIONAL READABLE DATA FIELD

CHECK DIGIT

OPTIONAL

HEIGHT

STARTING

POSITION

DATA

FIELD

QUIET
ZONE

QUIET
ZONE

START

CODE

STOP

CODE

OPTIONAL

READABLE

DATA

FIELD

CHECK

OPTIONAL

HEIGHT

STARTING

POSITION

DIGIT

GUARD

BAND

LOWER