I wired the 16 zone expander off the databus hub, and then the KPAS off the expander. I pulled power off the expander to power both motions. This was temporary setup. I measured 12 plus Volts off expander.
But the keypad and alarm seems to be doing some screwy stuff. When i set off alarm, turn it off by inputing code, then it goes off again... and some other weird stuff. I guess it does not help that I am unfamiliar with the KPAS.
Tonight, i will try to run dedicated power line, now that i got some wire.