Computer control through RC transmitter
 

I am currently working on a project building a RC submarine and I am interested if anyone has tinkered with somehow connecting a PC(computer) to an RC transmitter via trainer cable.
Or even if anyone knows of the types of signals transmitted using the cable (what formats, if any)

My goal is to use a compter program to control the sub through the transmitter.

Any information, even the slightest bit would be much appreciated!

Thanks a bunch!