Casio IT-800 Series Software Manual page 36

4. Minimum digit on NW7 symbology
The no. of minimum digits can be set to one digit only when scanning NW7 symbology is
enabled.
5. Minimum digit on Interleaved 2of5 symbology
The no. of minimum digits can be set to two digits only when scanning Interleaved 2of5
symbology is enabled.
6. Minimum and maximum digits on IATA symbology
•
The no. of minimum digits can be set is 15 digits or 17 digits for the maximum only
when the IATA check digit calculation is set to "Coupon number and Calculate data
segment" or "Calculate just data segment".
•
Setting the no. of minimum digits to 1 may result in higher error rate. Unless you need to
change it to 1, leave the default (= 4) unchanged.
7. The maximum digit count for just numeric data is 74 digits, or the maximum digit count for
just alphabet data is 41 digits.
8. Each no. of maximum digits in the table is defined by optimum condition affected by various
factors including bar code printed quality, resolution, PCS, sun light, distance between the
terminal and bar code to scan, etc. Depending on the condition of these factors, you may fail to
read a bar code even if you set maximum digits in the table for that bar code symbology.
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 bar code differs depending on the resolution and the scanning
distance between the terminal and the bar code.
36