Cause: When you print some types of bar code, for example; Interleaved 2-of-5 (ITF) or Code 39 you have a choice; to print a check character, or not to print a check character. For these types of bar code the check character is optional.
If you bar code readers is configured to expect check characters, and you are not printing the check characters, then the bar codes will not read.
Solution: If your application requires check characters then you must print them. If you application does not require check characters then you must configure your bar code reader to ignore check characters (i.e. switch off check character validation).
Cause: You may be printing the bar codes too small. Your printer has only a limited resolution, and your bar code reader also has a limited resolution.
Solution: Print the bar codes larger. Larger bar codes are easier to read (they can be read more efficiently). If you printer is 200 dpi (e.g. thermal label printer) then ask about special fonts for 200 dpi printers.
Tip: Always print bar codes as large as possible, not as small as possible.
Cause: If you are using a CCD type bar code reader, these types of reader have a limit to the size of the bar code they can read (e.g. 80 mm, 90 mm, 100 mm).
Cause: You are printing a check character, but your reader is not configured to expect the check character (so the reader is treating the check character as data).
Solution: If your application requires check characters then you must print them. If you application does not require check characters then you must configure your bar code reader to ignore check characters (i.e. switch off check character validation).
Cause: When you print Code 39 bar codes, some characters are special (lowercase a-z, and other characters). Special characters require two characters to encode them. If your bar code reader is not configured to convert the two characters back to the special characters, then you will see the two characters instead of the special character.
Solution: Configure your bar code reader to use extended Code 39, or full ASCII Code 39.
Cause: You may have chosen the incorrect font. For each bar code function, there is a font and font size to use. See: Bar code font name and font size to use to discover the font and font size to select.
Cause: If you are in design view, then it is correct to see strange boxes. Correct bar codes only appear when you Print or Print Preview (i.e. when the bar code is displayed or printed using the calculated characters).
Cause: If you get a bar code error message, the error message should be self-explanatory and no bar code is printed. Usually the problem is due to the data, for example, to print a UPC-A bar code your field must contain an 11 digit number (or your expression must return 11 digits). If the bar code function is not passed 11 digits, no bar code can be printed and error message is displayed.
Cause: A field contain that contains a Null or Empty value, will not bar code to print a bar code, which is as you would expect. A bar code error message does not occur if the field a Null or Empty value.
If you get error message, or results which you do not expect, please contact Technical Support and be ready to give details of the function you are using and other information about your report.
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