Honeywell 4820 Guía de usuario descargar pdf (Pagina 199)

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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 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 barcode. The following example shows how to con-

figure 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 num-

ber 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 barcode on page 9-2.

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

dash:

2-1-2-1 Weighted Modulo 10

Check Character

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Honeywell 4820 Guía de usuario Pagina 199