Serial ports numbering?

Hy @ all,

I’m sorry for this question but i don’t get it…
Wich serial port belongs to wich connector ?
I want to connect a ADS-B receiver on my PixHawk 2 but both telemetry ports are occupied.
So why not connecting it to the 2nd GPS port ? But wich serial port number is the correct one
for the GPS 2 connector ???
I have tried to understand the wiki but i don’t get it…
Can somebody please give me a link or a list ???

Thanks in advance…