Check Digit Calculation - Casio DT-X7 Series Software Manual

7. Maximum number of digits for RSS Expanded and RSS Expanded Stacked symbologies
The maximum number of digits is 74 for numeric data only or 41 for alphabet data only.
8. The maximum numbers of digits for each symbology in Table 2.25 are based on the optimum
condition of each element such as bar code print quality, resolution, PCS, brightness
surrounded, and distance between the terminal and the bar code. Depending on these elements,
even if one of the maximum digits in the table is set to a bar code symbology, you may face to
a difficulty to scan an individual bar code of that symbology.
9. If IATA symbology with its valid minimum number of digits is set to one, the chance of
misreading will increase. If there is no need to scan a bar code of the symbology with the
minimum number of digits set, do not change the default setting which is 4.
10. The RSS symbologies change its name to "GS1 DataBar".
RSS-14 → GS1 DataBar Omnidirectional
RSS Limited → GS1 DataBar Limited
RSS Expanded → GS1 DataBar Expanded
RSS-14 Stacked → GS1 DataBar Stacked
RSS Expanded Stacked → GS1 DataBar Expanded Stacked

Check Digit Calculation

A bar code value is calculated in accordance with method, and then the calculation result and the
check character at a specific position are compared. If they match each other, the scanning data is
deemed correct. The calculation method differs according to each symbology.
Readable Digits
The actual readable digit on a bard code differs depending on the resolution and the scanning
distance between the terminal and the bar code.
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