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