Did a bit of googling and I think I found a solution. It starts with this bit: [Link: wesroc.net]

And then this serial interface: [Link: wesroc.net]

Might need some other parts :). Good news is that the company seems to be very focused on this area so if the web site is not clear, I am sure a call to them would lead to a solution.

BTW, I would love to have one on my house too :). So please report back what you find.