My Macbook air does not interact with the scanner of my Epson L210 printer (to which it is connected via USB cable)

Hello sigfridop,

Thanks for reaching out to us in Apple Support Communities about issues connecting to your scanner. We're happy to help by looking into this more! 

The following support article provides some troubleshooting steps to try for this behavior:

Solve scanning problems on Mac

If you try all thee steps and still have issues, reach out to the scanner manufacturer to see if they have any suggestions.

Hope this helps.

Best Regards.