Reverse engineering 5V sensor

I got the DAQ (USB which connect to a computer) for these sensors (these are those school sensors like Vernier style) Vernier publishes their pinout, but these are cheap copies so the pinout is unknown, but now that I got their

What if I breakout the ethernet into a breadboard, so as the sensor is talking to the DAQ, I can use an oscilloscope to sequentially test all wires until I find the +5V GND and signal wires?
I just got the oscilloscope so I'm not sure... if I bridge two wrong cables, will it fry... or the oscilloscope protects it?

Thank you!