9 - 10 2020/4820/4820 i User’s GuideProgramming a User-Defined Check Character1. Scan the Enter OCR Check Character barcode, below.2. Enter the characters in order. For each character, look up the correspondinghex 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 toscan 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 onpage 9-9, enable the OCR-A font. Scan the Enter OCR CheckCharacter barcode on page 9-10, then scan the following hex valuesin order:3031323334353637383958After you enter all the desired hex values, scan the Save barcode on theinside back cover of this manual.Weighting OptionsBy default, the check character computation is unweighted. It is possible to useone of two weighted modulo 10 schemes. Weighting is often used to detect iftwo neighboring characters are transposed, a common error when an operatorkeys in data.3-1-3-1 Weighted Modulo 10 Check CharacterStarting 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, includingU.P.C. and Interleaved 2 of 5 (when a check digit is invoked). To apply thisweighting scheme, set the OCR check character to “0123456789x3x1” or scanthe following symbol:Enter OCR Check Character3-1-3-1 Weighted Modulo 10Check Character
