Setting port for hokuyo laser range scanner

edit

Hello

I have written the following launch file:

<launch>
  <node
    pkg="mark_pi_navigation"
    type="mark_pi_navigation.py"
    name="mark_pi_navigation"
    respawn="true">
  </node>
  <node
    pkg="hokuyo_node"
    type="hokuyo_node"
    name="hokuyo_node"
    respawn="true">
    <param name="port" value="/dev/ttyACM2"/>
  </node>
  <node
    pkg="razor_imu_9dof"
    type="imu_node.py"
    name="imu_node" >
    <param name="port" value="/dev/ttyUSB0"/>
  </node>
  <node
    pkg="rosserial_python"
    type="serial_node.py"
    name="arduinoLeft"
    respawn="true">
    <param name="port" value="/dev/ttyACM0"/>
  </node>
  <node
    pkg="rosserial_python"
    type="serial_node.py"
    name="arduinoRight"
    respawn="true">
    <param name="port" value="/dev/ttyACM1"/>
  </node>
</launch>

I am experiencing some issues with setting the right port for the hokuyo LRS. If I change the port to ACM0 (in launch file and physically) it works without problems... However it timeouts when trying to run from a different port.. I'm I writing the parameter wrong?

Thanks