The ONLY reason to setup a system the way I did is if there is an older system or only one wire pulled to the keypad location! If you are pulling wires to new locations, you should most definitely pull TWO cat5 cables to each keypad... anything less would be doing a disservice to your customers.

The only reason I used the RS485 was because it was an old Niles system with a single Cat5 pulled to each keypad... in a HUGE house. To pull a second Cat5 just so I didn't have to go keypad hopping while programming would be ludicrous.