DEL - perhaps you can clarify something.
My understanding of the M1XRFTW is that although it can handle up to 144 wireless zones, you do not have to use all of them. Thus, if you have the M!XRFTW set for data bus address 2 and want to use just 16 wireless zones with it (i.e zones 17 through 32), you could then install a M1XIN or even an M1XRFEG at data bus address 3 and use zones 33 on up. If you ever wanted to later expand to more than 16 zones on the M1XRFTW, you'd have a lot of reconfiguration work to do.
Do I have this right, or am I missing something?