VX4 connected to Focbox Unity through PPM

I move my VX4 receiver from UART to PPM on my Focbox Unity so is can run my Davega and now the the Unity won’t shut off, but if I unplug the receiver it will shut off. Anyone know what I can do to fix it?

i HAVE HEARD OF A UART SPLITTER.

I got a usplit from a buddy and its working great now. Thank you.