Alarm system module

[Steevo]

That might be similar, it has a dialer. The 521 does not.
That unit has the very same motion detector that the 521 doesn't seem to recognize.

The 521 recognized and installed all the door sensors and keypads/keyfobs the magnavox thing used.
But I haven't had success with the PIR yet.
It's not walk testing at the moment, so it might be just from age.

I had to scrap out a brand new door sensor, it installed but then a few hours later got flaky.

[Brian H]

Where the three manuals I scanned and attached in this thread any help?
http://forums.x10.com/index.php?topic=29785.0

From your other threads. Are you trying to use a MS10A Motion Sensor?
Did you initialize it as pointed out in the other threads. Before trying to enroll it?  If not initialized first. It will not be properly added.