0 channels detected frsky r9 slim + receiver,and pixhawk4 fmu v5

hello has anyone connected the frsky r9 + receiver to the pixhawk4 v5 controller or know how. when i try to configure using q ground control i get 0 channels detected. must i use a ppm encoder, the radio i’m using is frsky Qx7,I was able to get x8r receiver to detect but since i last up graded that not being detected either, but i’m able to configure both receivers in the joy stick set up,THANK YOU FOR ANY HELP

THANK EVERY ONE involved all channels and switches are detected using Taranis r9 slim + receiver. reinstalled upgrade went back to radio set up and all is well THANK YOU