What you need is the "engineering" manual, if you feel confident enough to make configuration changes (you will need your "engineers code", and you shouldn't mess with it if you have a maintenance contract for the alarm).
http://www.moretonalarms.com/pdf_engineer_manuals/Veritas8_INS034-12.pdf
The manual tells you how to "default" your panel, which resets the engineering code... but beware it will lose ALL settings if you do this, so only do it if you are confident.
Hope this helps
Chris
Chris, June 2007