Hello all!! I 'm fairly a newbie with alarm systems and I moved into a home a couple of years ago with a DSC (A*T alarm) PC1555/1555MX with a PC5508Z LED Keypad. When we originally moved in, we weren't provided the codes and didn't think it would be a big deal and of course, now I have no idea of how to contact them to get the codes. I tried a standard master code of 1234 with no luck (it doesn't arm the system) and gives one loooong beep. I would like to know if it's possible to set a new master code, or if necessary how to default this system.
Sooooo, I've been reading through the forums (which by the way ROCK!! I thought I'd be totally lost but they are VERY user-friendly THANKS!!) ... and found a couple of topics that were helpful and even links to the user's manuals for this alarm system.
BTW this has 4 zones written on the pad :
1) Door 1
2) Door 2
3) Door 3
4) Windows
The alarm shows "Ready" light on, and has a functioning phone line connected.
So far, I followed a couple of suggestions and one seems promising:
I keyed *8 5555 and there was a series of short beeps which by the post said was a good sign... unfortunately that was the last post in that topic so that's where I am at

I truly appreciate any help you can give me ...
Thanks!!
Edit:
wow... I have to give thanks to all!!
- Especially Ken LOL I got most of my help from your replies to previous posts
I have reprogrammed the master code and even added a couple of new user access codes.. I got rid of the annoying chime, and am about to run a system test...
There are a couple of other issues: the trouble light is on indicating #1 & #8 (battery and set time) -- my next step will be to reset the time/date with help from your excellent forums Grin and then tomorrow I'll have to go pick me up a new battery and replace it... (I'm so hyped up -- truly can't believe I went through it all by myself LOL) that I wish I could get one now but it's already past midnight ha ha..
anyhow thanks bunches!!!!