Thanks for your reply.

I was on the point to post about my progress...
So, I finally manage to get connection to the mount. The point was that the default configuration for the indy_synscan driver set the BAUD RATE to 19200 and, despite I changed it into INDI Control Panel, when I clicked the 'connect' check box, the BAUD RATE returned to the default configuration (19200) before the dialog started between my computer and the mount. I have to manually change the default configuration file to a BAUD Rate of 9600 to establish the connection.

I do not really understand why the BAUD rate switch back to its default value just before establishing the connection.

I also try EQmod driver, but in that case, I get very unsuccessful to establish the connection.
- If I set my telescope in PC direct mod I get

" message="Error:  -> Error connecting to port /dev/cu.usbserial: Port failure Error: Resource busy. Check if device is connected to this port."/>