ZBA ZB-3062, User Manual

Page: 74 / 89

ZBA Inc.
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OCR User-Defined Check Character
You can customize the check character calculation to suit your application. Each character of the check character alphabet can be programmed in its proper
order. The number of characters you enter determines the modulo value for the calculation. By default, the check character computation is unweighted, but
the imager also supports two weighted modulo 10 checking schemes.
Example: To program a modulo 11 check character, you would enter the following 11 characters in order:
0123456789X
Also enter the OCR template: dddddddc
Enable the OCR-A font, then scan the following string:
The imager performs the following check character computation:
(6 + 5 + 1 + 2 +3 + 5 + 1 + X) modulo 11 = 0
Since the result is zero, the message is considered to be valid, so the reader outputs the message: 6512351
Programming a User-Defined Check Character
1. Scan the Enter OCR Check Character bar code, below:
Enter OCR Check Character
OCR Modulo 36 Check Character Enter OCR Check Character
2. Enter the characters in order. For each character, look up the corresponding hex value from the ASCII Chart .
3. Scan the Save bar code on the inside back cover.
Example: To program the modulo 11 check character from example #8 , enable the OCR-A font. Scan the Enter OCR Check Character bar code, then
scan the following hex values in order:
3031323334353637383958
After you enter all the desired hex values, scan the Save bar code 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.
Weighted Modulo 10 Check Character
Starting with the check character and working backward through the message, the imager 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:
Example: Scan the 3-1-3-1 Weighted Modulo 10 Check Character symbol. Also enter the OCR template: dddddddc
Then scan the string below: