Check if this helps
http://answers.ros.org/question/3259/starting-p3dx-using-p2os
Always better to post these questions in answers.ros.org

On Tue, Feb 7, 2012 at 6:42 PM, ELENA LAZKANO ORTEGA <e.lazkano@ehu.es>wrote:

> Hi,
>
> we are trying to use ros to make our pioneer robot move. We followed the
> steps in http://www.ros.org/wiki/p2os/**Tutorials/Getting%20Started%**
> 20with%20p2os<http://www.ros.org/wiki/p2os/Tutorials/Getting%20Started%20with%20p2os>
> and configured the ROS_MASTER_URI and ROS_MASTER_IP of the base computer
> and the pioneer onboard PC accordingly.
>
> We run roscore on the base computer and the p2os_driver on the robot. The
> robot communicates with the H8S board properly. But when we run
> p2os_dashboard on the base computer, neither the battery level nor the
> option to enable/disable the motors change. Moreover, no message arrives to
> the dashboard although we do not see any error message on the terminal.
>
> Any hint?
>
> thanks in advance,
>
> elena
>
>
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-- 
Thanks,
Karthik