This is my thanks to all and particularly Jeff. I'm sure everyone has been unable to sleep wondering if my problem was resolved!(grin)
Jeff's mail WAS trapped in my spam filter a bit unusually, but he resent and I got his excellent suggestions. I had constant newbie problems, none related to equipment or software. Operator Error! But I bought the XTB-IIR to which I immediately installed a pigtail and connected at an outlet proximate to the distribution panel. After installation and checking to see if possibly there was shipping damage to the unit (none!) Jeff assisted and suggested it was a phasing problem. Smarthome had the easiest solution with their new gizmo that attaches to a 220 dryer outlet, also very near the distribution panel and which I don't use, and upon receipt and installation of it all problems resolved! (Except for the operator problems caused by some swapping of modules and not checking and changing the codes!)
In any case, thanks to all, and particularly Jeff. I've got exactly what I want and will now embark on expansion. THANKS!