DSC Alarm system integration with Arduino Mega/Shield/RS-232

Hi,
I have an old Powerseries 832 (PC5010) that I would like to do this with. I chose this way because I don’t want to run anything on my computer and I have some experience with Arduino. I have a few questions. How easy was this project? Do you get all your motion sensors and door sensors individually in Smartthings? Can you control sirens? Thanks!