When we worked on the analogue system we found that if you took a download out the panel and tried to change it and upload it again, it completely screwed the system up!
Hand on heart, I wouldn't touch it !!
If you really want to get some more info about it then the engineer who wrote the software (and who performed the download/upload) mentioned above was Kevin Mears who now works at Kentec in Dartford. He may be able to help.
Or you might try Ian Clennagan (?) who used to be McMillan but is now (I think) working for ADT.
If you find that the heads regularly disappear off the system this was due to the fact they apparently used a laquer on the steel contacts that oxidises over time and forms an insulating barrier !.. Our job had nearly 1000 heads and we used to "lose" around 20 a month !!!