This is the local programming page for the EVL-4. The factory settings are shown with keypad address 18 set as the partition one keypad address for the EVL-4. If like most people you're only using partition one of your Vista 20P, and you didn't previously have a keypad on address 18, you won't have to make any changes at all. My personal system is using both partitions, necessary changes are made on the next page.