Many thanks @datadiffusion, finally got around to doing this on my 9752, fitting a 3rd keypad and a wired door contact as you suggested. Your advice much appreciated :)
Many thanks for your advice, and for al-yeti's. The main system case is square. You've been great, I think I've got enough info to give it a go! Biggest faff is running the wire across the house. Thanks again for your quick and insightful responses :) Steve
Anybody able to advise? We currently have 2 entry/exits with 9930s but have a 3rd entrance where we'd like to fit another keypad and create a 3rd entry/exit. Is it possible? And is there a way of doing this 3rd entry/exit without cabling back to the 9651? Cheers, Steve