The USB is an internal USB port in the MINIX NEO N42C computer that runs the software. Usually I have three USB connections (ArgoNavis, MicroLynx focuser, and DS10TEC camera). For the purposes of this test I disconnected all the other devices so there was only one USB port used (COM4) so that there could be no confusion on which COM port was being used.
If you want a screen shot, I can do that tomorrow, but it will show one Com port in the device manager. It's just a little late in the evening to do that right now
