I use a CEM70 with stellarmate on RPi4
Using driver 'ioptron v3'
In the indi tab you can set the connection baudrate. For me it worked right from the beginning, can check later today my settings.
The USB B connector in the mount gave me trouble a few times so i now soldered a usb wire into the mount (the usb port is a srperate, smaller pcb). I now have no connection issues since then.
I run all my imagimg from the Rpi and use vnc to remote operate.
Cheers! BartRead More...