RR-80 Remote Schematics
OK, here's what I found. On the mini plug, the tip controls shutter and the ring controls focus. If those terms aren't familiar, the tip is the very end of the plug, the ring is the portion of the plug just below the tip, and the sleeve is the rest of the plug. So connecting the ring to the sleeve will cause the camera to focus. Connecting the tip to the sleeve will fire the shutter.
I don't know what the correspondence between tip and ring and left and right is. I am sure there is some standard for that.
I also found that, just like when using the shutter button, if you connect the tip to the sleeve, the camera will focus before the shutter fires.
I hope this was clear enough. If not, let me know and I will try again.