IMU_node doesn't work with 3dm-gx3-25, indigo, ubuntu 14.04

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Hi, guys, I saw that this Imu_node worked with 3dm-gx3-25 in fuerte, now I am trying to use it with indigo, under Ubuntu 1404, but doesn't work. when I run roslaunch microstrain_3dmgx2_imu microstrain_3dmgx2.launch

error is :

SUMMARY
======== 
PARAMETERS
* /microstrain_3dmgx2_node/angular_velocity_stdev: 0.00017
* /microstrain_3dmgx2_node/autocalibrate: True
* /microstrain_3dmgx2_node/autostart: True
* /microstrain_3dmgx2_node/frameid: imu
* /microstrain_3dmgx2_node/port: /dev/tty0
* /microstrain_3dmgx2_node/time_offset: -0.04
* /rosdistro: indigo
* /rosversion: 1.11.16

[ERROR] [1462778064.984122077]: Exception thrown while starting IMU. This sometimes happens if you are not connected to an IMU or if another process is trying to access the IMU port. You may try 'lsof|grep /dev/tty0' to see if other processes have the port open. timeout reached (in microstrain_3dmgx2_imu::IMU:read_with_timeout) You may find further details at http://www.ros.org/wiki/microstrain_3dmgx2_imu/Troubleshooting

I tried to run lsof|grep /dev/tty0, and it shows:

mech-user@test1-pc:~$ lsof | grep /dev/tty0
imu_node  7344       mech-user    9uW     CHR                4,0      0t0     1038 /dev/tty0
imu_node  7344 7360  mech-user    9uW     CHR                4,0      0t0     1038 /dev/tty0
imu_node  7344 7361  mech-user    9uW     CHR                4,0      0t0     1038 /dev/tty0
imu_node  7344 7362  mech-user    9uW     CHR                4,0      0t0     1038 /dev/tty0
imu_node  7344 7367  mech-user    9uW     CHR                4,0      0t0     1038 /dev/tty0

and if I kill one of these 5, the node will be killed, so the solution in troubleshooting doesn't match this problem. any helps?