Thank you for your replies.This can be done but I wanted more control (touch screen/ipod touch) then the ELK would allow or I found easier in a third party software.
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And to add with Lou's comments There are some supported Hard wired thermostats that work with the XSP. I use a TR-40 from RCS.
So M1XZW is not nesesarrily the only option for Zwave interface? I was going to use Vera2 based on excellent reviews for iPhone software. But reading some more, looks like there is an iPhone software for Elk as well. Then I don't really need Vera2, any recommendations for Zwave interface?