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Bar Codes5–104
UPC–A
The UPC–A bar code structure is shown in Figure 5–27 and described on the
following pages.
QUIET
ZONE
CHECK
DIGIT
LEFT
DATA
FIELD
CENTER CODE
RIGHT
DATA
FIELD
QUIET
ZONE
STOP CODE
QUIET
ZONE
START CODE CENTER CODE
CHECK DIGIT FIELD
STOP CODE
LEFT DATA
FIELD
RIGHT DATA
FIELD
HEIGHT
HEIGHT
QUIET
ZONE
SR, SC
POSITION
FIELD
START CODE
OPTIONAL READABLE
OPTIONAL
READABLE
DATA
FIELD
OPTIONAL
READABLE
DATA
FIELD
QUIET
ZONE
CHECK
DIGIT
LEFT
DATA
FIELD
RIGHT
DATA
FIELD
QUIET
ZONE
HEIGHT
FIELD
QUIET
ZONE
START CODE CENTER
CHECK DIGIT FIELD
STOP CODE
LEFT DATA
FIELD
RIGHT DATA
FIELD
HEIGHT
QUIET
ZONE
SR, SC
POSITION
SR, SC
POSITION
NUMBER
SYSTEM
CHARACTER
N
NUMBER
SYSTEM
CHARACTER
N
N
NUMBER
SYSTEM
CHARACTER
N
NUMBER
SYSTEM
CHARACTER
NUMBER
SYSTEM
CHARACTER
FIELD
C
CHECK
DIGIT
CHARACTER
C
CHECK
DIGIT
CHARACTER
STOP CODE
SR, SC
POSITION
START CODE
NUMBER
SYSTEM
CHARACTER
FIELD
CENTER
CODE
C
CHECK DIGIT
CHARACTER
CODE
C
CHECK DIGIT
CHARACTER
NUMBER SYSTEM
CHARACTER FIELD
DATA FIELD
2– or 5–
DIGIT
ADD–ON
CODE
2– or 5–
DIGIT
ADD–ON
CODE
2– or 5–
DIGIT
ADD–ON
CODE
2– or 5–
DIGIT
ADD–ON
CODE
Figure 5–27. UPC–A Structure