Was there something wrong with continuing this in
your other thread? When you do something like this you make the people here do extra work for nothing and you reduce the chances of someone looking for the same thing in the future to find the answer. You also reduce people's will to help you.
Your problem is still unclear - is the problem using serial comm in general? Is the problem using serial comm with this specific plane? Is the problem with formatting the data you get from the joystick to fit the plane?
Also, you didn't answer my last reply in that thread - you still need to know the protocol for speaking with the plane. If your problem is with this part, you can post an example of how a command should look and we can try to help you.
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