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108
Chapter 3 Bar Codes
Code 128A, 128B and 128C
The Code 128 structure is shown in Figure 11 and described on the following
pages.
Figure 11
. Code 128 Structure
DATA FIELD
QUIETQUIET START STOP
LOWER GUARD BAND
CODE CODEZONE ZONE
OPTIONAL READABLE DATA FIELD
CHECK DIGIT
OPTIONAL
DATA
FIELD
QUIET
ZONE
QUIET
ZONE
STOP
CODE
START
CODE
GUARD
BAND
OPTIONAL
READABLE
DATA
FIELD
CHECK
OPTIONAL
SR, SC
HEIGHT
HEIGHT
SR, SC
DATA FIELD
QUIETQUIET STOP START
UPPER GUARD BAND
CODE CODEZONE ZONE
OPTIONAL READABLE DATA FIELD
CHECK DIGIT
OPTIONAL
HEIGHT
POSITION
DIGIT
DATA
FIELD
QUIET
ZONE
QUIET
ZONE
START
CODE
STOP
CODE
GUARD
BAND
CHECK
OPTIONAL
HEIGHT
SR, SC
POSITION
DIGIT
UPPER LOWER
POSITION
GUARD
BAND
UPPER
UPPER GUARD BAND
LOWER GUARD BAND
SR, SC
POSITION
GUARD
BAND
LOWER
CCW
Normal
INV
CW