Futaba says that due to the safety feature in the computer radio that does not allow it to function as a trainer slave with the switch in the on position, which is what is needed to use as a controller on the pc.

The usb does not produce the required 9.6volts to power the tx with the switch off activating the training mode. With the switch in the on position the radio transmits as normal because it does not read the usb pc as another Tx......

They were kind enough to inform me that they sell the interlink controller, and that the nexstar has a powered cable interface..... LOL