Argox AS-9500 - Manual (Page 140)

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The reader performs the check character computation below:
(0 x 3 + 1 x 1 + 2 x 3 + 3 x 1 + 4 x 3 + 5 x 1 + 6 x 3 + 5 x 1)
modulo 10 = 0
a. Weighted Modulo 10 Check Character
Since the result is zero, the message is considered to be valid, so
the reader outputs the message: 0123456
b. Weighted Modulo 10 Check Character
Starting with the check character and working backward through
the message, the imager applies a multiplier of 1, then 2, then 1,
then 2, and so on. When the result of the multiplication is greater
than 9, add both digits to the running sum. This is often referred to
as the LUHN formula. One common application of the LUHN
formula is validate credit card numbers. This is the modulo 10
checking scheme used in MSI Code and in Code 32
Pharmaceutical (PARAF). To apply this weighting scheme, set the
OCR check character to "0123456789x2x1" or scan the
following symbol:
Example: Scan the Weighted Modulo 10 Check Character symbol.
Also enter the OCR template: ddddddc
Then scan the string below: