If it is easier to figure out, the system wiring diagrams are available on net, via google, intercom; type in bell system 801 wiring diagram, card reader is an easiprox stand alone system,, the door magnet is just a positive and negative supply, the relay is a 12v dc 8 pin 2 pole, . I have the supply to mag in n/c with a supply in common, I have the positive permantly on the coil, the exit button switches the negative to terminal 7 and card reader n/o into 7 also, as I understand the z terminal on intercom was to also go in terminal 7, easiest way of doing it as it switches coil when anything is pressed, I hope that can help but will understand if you see wiring diagrams, easy system not complicated just not functioning! Thanks for advice guys