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# What is Symbol Diagnostics (feature key required)?

Symbol diagnostics is a feature that provides graphical feedback from the device for NoRead barcodes. By looking at the feedback, you can troubleshoot why a barcode failed to decode. The feedback provided can signal the following issues (in a region of the barcode):

- Start or Stop pattern was not found (orange arrow on code)

- Damage/print-error inside the barcode (red rectangle region on code)

- Quiet Zone is not sufficient (magenta rectangle region on code)

- Checksum verification failed (blue rectangle around the code)

In addition to graphical diagnostics, Symbol Diagnostics returns readability metrics for each NoRead result, shown at the top left corner of NoRead codes. Metrics can help you assess the image or print quality and help in improving the existing setup.

Symbol diagnostics is only available for uploaded PNG images (Actions>Images>Upload Image) that are signed by a Cognex reader (not necessarily the same reader; images are signed automatically when saved from any reader). After uploading an image, check the Image Panel or Quick Setup image window for Symbol Diagnostics feedback.

Note: Symbol Diagnostics is a feature that is activated exclusively by feature key.

Note: DM070, DM080, DM150, DM260, DM280, DM290, DM300, DM360, DM370, DM380, DM390, DM470, DM503, DM580