Is there any examples or documentation on implementing the Virtual Channels 3&4

I am wanting to use the 2 virtual channels(ports) in the receiver to interface with an Arduino which would require a 0V or 5V output into an Arduino channel or other digital input device. I see that it is an active low sinking output, but not sure what I would need to do to interface it with other digital input devices. Are there any diagrams or examples that can be shared on how to do this? Or any tutorials on integrating the virtual channels? Any help would be greatly appreciated.

Thank You,

It is like below

Share common ground between our receiver and your Arduino device.
When relay 3 activates, the port is connected to GND, then it would be similar as you pressed button on the Breadboard in photo.