on what port would i plug my pt in on the recevier?

Any unused one.

Except the RS232 port. I know, I tried

There's a RS232 port on a 2104?

Man, I need to wake up before posting! I run the 4PL with FHSS receivers. My daughter uses a 3PMX FASST system. Her truck was the one having some trouble and I added a fan. Before getting a splitter, I thought I'd try her PT in the RS232 port...which of course didn't work.

Thank you for keeping me in line

thanks guys.have anyone had any trouble out of their 4pl.i am thinking of moving to 1 just trying to get a good vibe on 1 first