Hi Fred,
You have yourself very confused on this; it is actually very simple:
The ports you listed are virtual serial ports that you can use when plugging a USB cable into
the control RRC. This replaces the need for either a serial cable or a USB to serial converter.
In other words, just use the COM1 (which is COM7) on your PC for CAT over the USB cable.
To use it, go into the RRC's serial settings. You need to set it to mode-6 or mode-7, change the
baud rate to whatever you need for HRD (it doesn't have to be the same as CAT/COM2!) and
make sure to set use USB as serial to yes.
Then you can use HRD with your setup.
Note to other users: this way of using CAT is only necessary for a Twin setup on Yaesu and
Elecraft K3. All other installations pull CAT off differently.
73,
Mitch DJ0QN / K7DX (currently at Florida home)