Pixhawk 4 PPM RC pinout needed

Hi all-

I have a pretty basic question about connecting a PPM encoder to a Pixhawk 4. I’ve combed the web for a while now and have been unable to find any documentation that tells me which pin is which on a given connector!

I don’t happen to have a 0.1" 3-pin header (encoder) - to - miniature JST connector (pixhawk) cable, so I have to make one up. No problem, as long as I can figure out which pin on the PPM RC connector is 1 and which is 3!

Any pointers would be greatly appreciated.