How to connect second camera

The plane has two cameras.
The first camera is controlled by px4. How to connect the second camera so that they shoot synchronously? The cameras are different.

Use a Y-Cable to the same port or set servoXX_function to trigger for multiple outputs.

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Can you give me the link for manual “set servoXX_function”?
And if i want to shoot camera #1 every 10s and camera #2 every 5 second (optional) )))

i have qx1(20Mp) RGB and mapir 3w RGN(12Mp)

I don’t think the multi camera independent trigger capability is there yet. Here is the start of the Servo Parameter section for plane: http://ardupilot.org/plane/docs/parameters.html#servo1-parameters