I beleive it's not SC1200, but it's actually the DS10A:
Same as the powerhorn, x10 has changed it design a lot on the DS10A w/o letting us know.
In order to get rid of the LOW BATT msg, there're some certain model of the DS10A will be pain: you have to reset it by pressing and hold the test button untill it blink few times, then remove the batt, and re-insert.
Now, watch out if you are using AHP with On Alert: again, I found not ALL DS10A acts the same way, but if you not have it reset until correct address, it can send out all bunch of crappy A000TV, or M000TV cmd, and sometime... it even trigger twice close one, or trigger three times, close two. Even trigger but not close!
I open my Activity Monitor (F2) while resetting the DS10A and observe untill seeing it's clearly triggerred/closed, then married with DS7000 or SC12A.
Good luck and have fun,
P.L