Honeywell 2020, 4820, 4820i OCR ISBN Application Example, Example:, "0123456789x2x1

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:

2-1-2-1 Weighted Modulo 10

Check Character

Example: Scan the 2-1-2-1 Weighted Modulo 10 Check Character symbol. Also enter the OCR template:

ddddddc

Then scan the string below:

0128454

The reader performs the check character computation below:

(0 x 1 + 1 x 2 + 2 x 1 + 8 x 2 + 4 x 1 + 5 x 2 + 4 x 1) modulo 10

=(0 + 2 + 2 + (1 + 6) + 4 + (1 + 0) + 4) modulo 10

=0

Since the result is zero, the message is considered to be valid, so the reader outputs the message: 012845

OCR ISBN Application Example

One application of OCR is to read the ISBN characters typically encoded using the OCR-A or OCR-B font. This is especially useful when the ISBN number is not encoded in an EAN-13 bar code. The following example shows how to configure the image scanner to read the ISBN strings on books in Japan. After you have followed the steps below, you will be able to scan the following ISBN number or the additional data below it, depending on the line of text at which the image scanner is aimed.

1.Scan the OCR-B On bar code on page 9-2.

2.Program the user-defined variable “g” to comprise the ten digits plus the dash:

9 - 11