6-14
A-61635 December 2010
Bar code zone dialog box
(continued)
Verify checksum
— check this box if the bar code contains a checksum
character. Checksum characters help ensure the accuracy of bar code
reading. Not all bar code types support checksum verification. Bar code types
that optionally support checksum verification include:
Code 3 of 9
CODABAR
Interleaved 2 of 5
Some bar code types like PDF417, UPC and EAN have a built-in checksum
routine that cannot be disabled.
If you disable
Verify checksum
for bar codes containing a checksum, the
checksum value (usually the last character of the bar code) will appear in the
bar code value; otherwise, the check digit will remain hidden.
If checksum verification fails during scanning, a bar code value is not
generated, causing
Kodak
Capture Pro Software index field audits to fail.
Some bar code types, such as Code 128, have mandatory checksum
characters. The code is always present and must be correct for the value to be
read. Other codes such, as Code 39, have optional checksum characters
which then add an additional code when present.
To read invalid Code 128 symbols, you can select the
Minimum partial read
characters
option. It will report the data characters even if checksum fails. The
invalid checksum will not be returned. When the bar code has an optional
checksum, it will not be validated by the software. It will operate based on the
bar code specification.
Selecting
Minimum partial read characters
for a bar code with an optional
checksum will return what it finds, whether it is good or bad. There will be
occasions when the bar code returns the correct result but the checksum itself
fails. Since the checksum is implicit, it is not returned and cannot be directly
tested.
Minimum partial read characters
— check this box when you want Capture
Pro Software to generate a bar code value, even if a bar code is incomplete. If
this option is checked, enter the minimum number of characters that will be
allowed for a partial read. This is useful for bar codes that are only used for
document or batch separation where the absolute value is less critical.
For indexing purposes, it is recommended that you define field masks and
minimum lengths.
Kodak
Capture Pro Software will not produce any bar code
value if the bar code is incomplete and the
Minimum partial read characters
field is disabled.
Minimum partial read characters
should not be used when
Verify
checksum
is enabled, as this may result in a bar code value being generated
when checksum verification fails.
