I have exactly the same communication issue with a brand new iOPTRON GEM28 mount. Connection via
USB cable from go2Nova 8409+ handcontroller to ASIAIR Pro does not work: ASIAIR app always says USB NOT CONNECTED, I cannot pick a baud rate. I even cannot have a look what is happening upon connecting the cable
to ASIAIR because login to the device via VNC is not possible.
I have connected the mount via USB to a friend's RASPI4 running STELLARMATE and the OS tells me
"Full speed USB device found using xhci_hcd, idVendor=0403, idProduct=6015, bcdDevice=10.00.
Product FT230X Basic UART FTDI". With the STELLARMATE RASPI4 the connection to the mount works flawlessly.
So it is obviously a problem that ASIAIR does not detect the UBS2Serial device in the handcontroller...
Helmut
Cologne/Germany