OK, then we know Serial-USB-Converter, related driver and GUI are OK and working. The problem is as expected the drone. It does not initialize.Yes , com1 Port is FTDI,, so, when I connect the USB cable comes the com1 port, if I disconnect it it leaves, but it makes no difference if I leave it connect it to the PC, and disconnect it from the Q500, or if I torn on or off the Q500, the com1 still the same.