I have a 1991, Vista XM, 4140 XM with an Ademco 1876-1 motion detector that I would like to replace with a Pet Immunity Motion Detector. The unit has worked flawlessly over the years. I have 2 - seven pound Yorkies that roam the Family Room with the Ademco 1876. We bypass all three of the motion sensors in the house when the pups are home but would like to replace the Ademco with a Pet Immunity detector, less than 100 pounds... you never know when you might have a 100 pound burglar... I have a NIB IS-150 that I never installed years ago, but it does not have the proper lens. I also have 2 installed Coral Plus Sonic motion detectors, but they do not have the correct (D) lens either. So, here is the $64,000 question... What is my best action? Replace with an Aurora? Mask the Ademco 1876 with the all famous duct tape? Locate (yeah right) a Pet Immune Lens for the Coral Plus, a lens for the IS-150 or a prism for the 1876? Any suggestion (other than get rid of the Yorkies or replace the entire system) will be much appreciated. Thanks, Chris

I took over a space that has a dsc 4020 with a 4820 card reader unit attached. the unit was unplugged and the time is now from 2005 and there is a trouble code. The only code i have just arms and disarms the alarm. i assume its not a master code. if i enter it all it does is arm the alarm. is there any way to reset this thing so it goes back to factory codes? i tried unplugginf both batteries from the 4020 and then unplugged the power.. once plugged back un it made one small beep and then was back to same state.. nothing changed.. what else can i do? do i need to also disconnect battery from 4820 to reset the 4020? is there any way i can tell if the code i have is a master code or not?? i have been told this system is not locked...