For save setup, ('L' command), there are two bytes read if((address < 11 && address != 2) || address > 47) (decimal values), else, only one. See code of procedure TSetupTelescope.Button_EcrireClick in Setup.pas (from the DLL code) or better, the defines at the beginning of the C code of the microcontroller. Speeds, power, precisions and corrections are set using these commands.