Specifications

57
6. Minimum and maximum digits on IATA symbology
The minimum no. of digits can be set to 15 or 17 for the maximum only when the IATA check
digit calculation is set to “Coupon number and Calculate data segment” or “Calculate just data
segment”.
7. Maximum digit on RSS Expanded symbology
The maximum digit count for just numeric data is 74. The maximum digit count for just
alphabet data is 41.
• The maximum no. of digits for each symbology in Table 3.20 is based on the optimum
conditions of each relevant element such as the bar code print quality, resolution, PCS,
brightness surrounded, and distance between the terminal and the bar code. Depending on
these conditions, even if one of the maximum no. of digits in the table is set to a bar code
symbology, an individual bar code of that symbology may not be scanned.
• If IATA symbology’s minimum no. 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 its minimum no. of
digits set to one, do not change the default setting which is 4.
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, 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.