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Troubleshooting: Barcode not printing

If a barcode is not printing or it’s printing incorrectly, some common problems may include:

  • Passing more digits than a symbology permits, resulting in an invalid string
  • Implementing generate checksum/UPC-EAN check digit when the data string already has the check digit calculated
  • Using alphanumeric characters for a symbology that only permits numeric characters
  • Setting the print output to the wrong DPI (dots per inch)

It’s important to review the specifications of a particular symbology before implementation: GS1 Barcodes – Standards. Some information on how various barcodes work in connection with eFORMz can be found here: Barcode Reference

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