This is a continuation off my introduction thread.. just creating a thread for this specific topic. I have an apparently old DSC PC1555MX based security system. Don't know any of the codes, the default master and installer codes don't work. It only has 6 zones. I'd like to upgrade to 14'ish to be more specific about where alerts are coming from, rather than "Upstairs" or "downstairs door" I have two keypads.. one by garage entrance to house, and one in master. So perhaps time to upgrade as @tangent is suggesting. If I was going to expand that board for more zones, I'd need a larger lock box (or whatever you call it) so would have to re-wire it anyway. If you were starting from scratch, and would have a combination of wired security devices(windows, motion) and wireless (adding new things such as glass break detection), that you wanted cellular monitoring for, along with smart home integration (smartthings).... 14'ish zones... suggestions what to look at? Wouldn't be tied to DSC anymore either I suppose.