I installed a Scopio alarm on my 12R by wiring it directly to the battery, and not to anything else. It took about 10 minutes.
I didn't bother with the signal or headlight flashing function, just the perimeter sensor.
The alarm box is stuck to the battery, the motion sensor is under the very back of the seat stuck to the frame. The sensor is only effected by metal, not plastic, by mounting the sensor here it essentially made a "blind" spot directly behind the bike, working out perfect for me to put my tent directly behind the bike so I wouldn't set off the alarm while sleeping, but have my campsite "protected".
It worked quite well, though it only went off when I forgot to disarm it in the morning... raccoon's don't set it off.
I had the sensitivity set so it would start chirping when you are about 5 feet from the bike (except coming from directly behind). I played with it a bit, you could mount the sensor near the battery to get slightly better coverage for the luggage area, this is just worked for what I wanted.
Hope this helps, I might have a photo of the install, let me search.
here's a thread that might help you understand the CAN-BUS:
http://www.advrider.com/forums/showthre ... ht=can-bus