Cytech Comfort Alarm system. Just need keys 0-9,* and # - each one just send a simple command. Doing this simulates a keypad.
So presing 1234# in sequence would actually log you into the system then you can do more things, etc. Useful for arming/disarming plus more.
Had a play with MainLobby a while back - worked all right - but slow as a dog and no use for an alarm panel login system. Hence trying LinuxMCE - basically cause it's linux based.
So if any bright spark knew how to add some simple RS232 commands as above, you'd get a lot of Comfort users around the world very interested indeed.
No problem, now someone else needs to tell you how to set up the RS232 as I haven't got the foggiest.
But it would help if you tell us what it is, manufacturer and model.