Hi @emil, no, sorry I wasn't clear -- it was pretty obvious how to hook up the Orbit 57069 rain sensor (2 wires, 2 terminals).
I was only unsure about the two common terminals until you explained it. I ended up using the right side common terminal (only) and it works fine.
By the way, I really like getting the rain sensor trigger notifications on my phone. Besides the obvious geek factor, having this recorded in the Iro's history is actually useful because it helps me tune the duration adjustment on the sensor (a movable window that controls how quickly the internal discs dry out)..