Old Powermax Compatibility

I ordered up a Veralite last week and in anticipation / preparation for its arrival I found this thread regarding the potential for Visonic Powermax integration.

On the surface, it would appear that my unit is compatible, but just want to verify with those with experience, since my unit is over 10 years old, however, it does have a RS232 serial port module connection available.

My unit is the one referenced here (along with links to manuals, etc):

http://www.homesecuritystore.com/p-754-visonic-powermax-wireless-security-system.aspx

Just want to make sure, before purchasing the necessary bits and piece (given the age of my unit), that it is worth pursuing.

Thanks!