Ok, I don't know way my code doesn't appear... anyway, the name of the parameter is "port", and the value is your device (ie /dev/ttyUSB0) param name="port" value="/dev/ttyUSB0" Enea Scioni -- View this message in context: http://ros-users.122217.n3.nabble.com/Problem-in-starting-the-p2os-tp1559880p1560464.html Sent from the ROS-Users mailing list archive at Nabble.com.