When connecting the Futaba 9C to the Interlink Elite Tx on the Real Flight G3.5, does the 9C have to be turned on or will the display power up when the adapter cable is connected?

I do not have a 9C anymore, but I have a friend that does and he says the Interlink works fine, but when he connects his 9C to the Interlink, Real Flight will not recognize it.

I was hoping I could find someone who is using the 9C and find out how it is supposed to work.

My friend is on the road and has not had a chance to try all of the suggestions that I have given him.