OS (build and version) you are using the scanner with?
Is this a new behavior? Did the scanner ever work? Something happen or change? (Dropped, moved, etc)
Have you performed any troubleshooting?
Power cycled the device, reseated the cables, moved the connection to a different port?
The error usually indicates a communication failure. Either from damage, hardware failure or inability to communicate.
Bay Area - CA
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07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM