Tom, All
Here is my Win 7 X-Plane 10 setup.
This is the USB to RS-232 Converter that you can buy from the iFly shop.
It is an active device and come with drivers.
https://ifly.adventurepilot.com/shop-t136/usb-to-serial-cable.aspx
If you don't have the old 9 pin RS-232 jack on your computer you will need the following so that you can use a USB Port on the computer.
You will need a 9 pin Female-Female Null Modem adapter. (see photo)
And a short 9 pin male to USB extension cable. (Study the cable lengths to reach your computer and the iFly).
http://www.serialstuff.com/products/Windows-7-64%252dbit-Compatible-USB-to-Serial-Adapter-RS232-DB9-Short-8-Inch-Cable.html
When you plug in the ( iFly USB cable) to your computer make a note of which COMM Port is activated, you will need to know that when you configure X-Plane. In my case it was COMM3 as you will see in the photo.
Next, in X-Plane, you have to configure the NEMA Output.
Look under settings for the Joystick & Equipment then Equipment tab. (see photo)
Walter suggests a setting of 3 transmissions per second to replicate the on-board GPS update rate. In the photo my rate was set to 5. For me 5 was a little smoother, but start with 3 as suggested. 10 was too high, it made the iFly sluggish on button pushes, etc.
Walter also says to start X-Plane first, once it is up and producing NEMA stream, connect it to the USB port of the iFly.
Once you connect to the iFly in the nav mode, the map should change to the airport where you are in X-Plane, in some cases it has taken almost 2 minutes for the sync to happen, so be patient.
That's it.
It really works great.
Much Thanks to the iFly Dev Team!