RC transmitter can't pair up with pixhawk

I have a RC transmitter mainly for a toy car and tried to apply on my pixhawk system, but nothing shows up on the screen when both pixhawk and RC were on. Is there any other way to pair them up? Thanks.

Pixhawk accepts PPM, Sbus. Is that what the Receiver outputs?

So it looks like this in the case I mentioned.

That doesn’t tell me anything. What receiver do you have?