jrubenstein,
I'm sorry, I realized the error in my logic and deleted my post (while you were apparently in the process of posting). I apologize, I would not have done that had I known you were in the process of posting.
From what I can see in my interface - if left disconnected from the computer the RTC (real time clock) will continue to operate and the interface will activate 1 hour earlier on Nov 4. In order to correct for this 1 hour AHP programmed change, the CM15a will need to be connected to a PC to adjust the RTC forward by 1 hour (no net change in GMT).
My commentary on Indiana joining the DST collective was "tounge-in-cheek". My youngest child now gets on the bus in the dark year round. I'm also separated from the west coast (where 5 of my sister companies and countless customers are located) by three hours - that's a pain. I sure am glad that my lawn gets that extra hour of sunlight though!