Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I think you need to have the right programmer software for the particular and specific model of radio that you wish to program.
For your FD2RT radio by Yaesu, you need specific programmer software. Unfortunately the list on this page does not include your Yaesu radio model #:
It unfortunately appears that the radio model you have stated has no programmer software for it. As a matter of fact, I cannot find a 'Yaesu FD2RT' model described in any detail. Please look for the manufacturer's label on your radio, and identify its model # ***** way, and tell me what it is.
Did you buy the software for the FT2D specifically?:
OK. Try re-seating the cable on the radio end, and while doing so, check for dirt or dust in the radio's port. If any whatever is seen, brush the radio's port out with a clean dry brush, then re-seat the cable and try again.
It is suggested that you try reading from the radio first.
If the cable looks cheap, that might be the problem.
I don't know of any data port setting on the radio, and research turned up no mention of such a thing.
Be sure the setting of the chosen port, in the software on the PC, is accurate to whatever USB port you're using on the computer.
That's puzzling. I thought the RT software for Yaesu had a setting allowing you to specify COMx (Com port number) even if you were using USB port(s) on your computer. Look again among the settings, I recommend.
Then I am out of ideas, and frankly, having made little progress with the case, I feel I ought to turn it over to other Experts, some of whom may have more idea of what you can do - aside from 'replace the cable and software' and/or 'replace or service the Yaesu radio' - than I have.
So I have Opted Out, opening the case to other Experts.