Hi,
thanks for the reply. Your reply was very kind re most wired alarm systems and bell boxes being compatable and that its just the wiring that needs sorting. My alarm system is an 'ALTO' AL2163 with built in communicator outputs and remote LED keypad. I've read that direct from the front of the engineering information! The bellbox is (as I've already mentioned) a Texecom Odyssey 1E. Thanks for any help you can give with sorting this problem. David