I have done the mod to the Tx which is contained in this PDF Document off RCGroups PDF Document which again I don't know if its right because I have seen different guides where they don't use resistors and guides where they use different resistors.
Also I haven't done any wiring to the XJT module because I am not too sure the way it is wired. I know from reading posts by Mike that the 5th pin on the XJT module is used for S.PORT data but not too sure if something else different needs wired up in the modules.
I have looked for ages in google but no avail of understanding this situation any better because I have had conflicting arguments where one person says it's not possible and reading another post on the EX9R part of this forum that someone has got it working including RSSI info.
Just wanting some light shed on the information.
Thanks
Chris
*EDIT*
After reading more and more about it would it be possible to do this as described in the picture where you connect to pin 41 and 42 with the resistor. Then to my understanding you then take wires from the MOSI and MISO and wire them to a RS232 to TTL converter where the MOSI and MISO off he 9XR connect the TTL side of the converter and then run a cable to the back of the XJT module using a cable to connect to the RS232 port?? It doesn't have to be internal, one wire running would be OK if this solution was to work.
Thanks
Chris
![Image](https://gruvin9x.googlecode.com/svn/wiki/FrskyInterfacing.attach/frsky-wiring.jpg)