Useless image is useless. Nothing to see there.
Is that an incoming or outgoing signal?
Anyway, what's stopping you from trying it out? Just make sure you put two or three diodes and small resistor (200-500 Ohm) in the line to drop the voltage to 3V (I assume you have a 5V Arduino) and limit current (protection of both sides - you don't know what you're connecting to really) and see what happens.