Wuench, thanks for the clarity. So is there any list of detectors that will work with the M1-Gold (i.e. smoke detector, motion detector) or just any will work with it? Also, do you know how many wire are in the CO/smoke detector combo. I also read that all smoke detector should be home run to the panel, will M1 gold automatically allow all smoke detectors to communicate with each other (i.e. if one goes off, others should go off too)
I haven't done smokes yet. You will need to check the instructions on the CO/smoke combo but I would assume 6 wires, 2 for power, 2 for smoke relay, 2 for co relay.
Realize that the smoke alarm will set off you main M1/Siren, so you don't need to worry about it setting off all the rest. But the rest may go off too I don't know.
There are two options that I have read about on how to wire smokes. You can do a purely low voltage smoke option, running from the M1 to each smoke and they are powered by the M1. Some municipalities seem to have code issues (or maybe uneducated inspectors) with this scheme and demand 120v smoke detectors. But this is nice because the M1's battery provides power backup, no more replacing 9V batteries.
The second option is to use 120V smoke detectors that have a relay you can wire to your M1. So they are not powered by the M1. The most common one I have seen is the GE350cx. You can just wire one smoke with a relay into the system, and if any one goes off the relay gets triggered.
Lastly, I hope you are adding up all the power requirements for all of these devices powered by the M1. You need to stay under 1 amp when not in alarm, and you need to determine how big a battery (or number of batteries) to buy to support how long you want all these to stand up if a power outage occurs. If you go over 1 amp, you may require an external supply, if you look at my pics in my signature you can see the one I have. It powers my M1XEP, router, etc, so my network stays up during a power outage.