Arduino 2900 + MD25

Hi all,
I'm a newbie and i'm traying to connect my MD25 with Arduino duemilanove using I2C. I was successful in connecting MD25 through serial interface and when MD25 is setting for I2C (no jumpers) it's flashing its address (0xB0) so I don't think it is broken.

I followed exactly the wiring example illustrated here: Arduino Examples and I used the relative sketch:

The sketch hangs waiting for a reply from MD25.

Does anyone a working sketch or any suggestions to make it work?