Companion Computer Telemetry Port Config Param

Hello,

I’m using an Arduino as a companion computer and so far everything is working well while my Pixhawk is connected via USB to my Laptop. The Arduino is connected to Tele2 port on the Pixhawk. All data send by the Arduino can be displayed in the Mission Planner.
Now I want to fly my drone and receive the send data from the companion computer in my GCS (Mission Planner). The downlink radio is connected to Telem1 port.

Now my question, should I set a passthru from port Telem2 to Telem1?
How to configure the serial parameter in MP?

Should it be SERIAL_PASS2 = Serial1 and SERIAL_PASS1 = Serial2 ??

Thanks in advance