Standard motion detectors use 4 wires. Two for power and two for the relay. The relay tells the alarm panel if there is motion or not. It does not send electrical signals or anything like that. It's a dry contact. I hate to be so blunt, but that is who I am and I will not change for anyone, and probably the reason I got banned from the other forum, but this is extremely basic burglar alarm knowledge. What are you gong to do when the hard stuff comes up? Is this your first alarm system project or do you have some experience?