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9 - 10
2020/4820/4820 i User’s Guide
Programming a User-Defined Check Character
1. Scan the
Enter OCR Check Character
barcode, below.
2. Enter the characters in order. For each character, look up the corresponding
hex value from the
Code Page Mapping of Printed Barcodes
on page A-6.
Use the
Programming Chart
on the inside the back cover of this manual to
scan the two symbols for each hex value.
3. Scan the
Save
barcode on the inside back cover.
Example:
To program the modulo 11 check character from example #8 on
page 9-9
, enable the OCR-A font. Scan the
Enter OCR Check
Character
barcode on
page 9-10
, then scan the following hex values
in order:
3031323334353637383958
After you enter all the desired hex values, scan the
Save
barcode on the
inside back cover of this manual.
Weighting Options
By default, the check character computation is unweighted. It is possible to use
one of two weighted modulo 10 schemes. Weighting is often used to detect if
two neighboring characters are transposed, a common error when an operator
keys in data.
3-1-3-1 Weighted Modulo 10 Check Character
Starting with the check character and working backward through the message,
the image scanner applies a multiplier of 1, then 3, then 1, then 3, and so on.
This is the checking scheme used in many EAN•UCC symbologies, including
U.P.C. and Interleaved 2 of 5 (when a check digit is invoked). To apply this
weighting scheme, set the OCR check character to
“0123456789x3x1”
or scan
the following symbol:
Enter OCR Check Character
3-1-3-1 Weighted Modulo 10
Check Character
Summary of Contents for 2020
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