Error connection between UM7 and ROS

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Hello,

I am using the UM7 Orientation sensor with the USB Expansion board. I am using um7_ros to use the IMU with ROS. It is getting detected and the port is /dev/ttyUSB0. But when I run

rosrun um7 um7_driver _port:=/dev/ttyUSB0

it gives the following :

[ INFO] [1475608698.166198336]: um7_driver ver 0.0.2 connected to serial port.  
[ WARN] [1475608698.264480968]: Timed out waiting for packet from device.   
[ WARN] [1475608698.362741924]: Timed out waiting for packet from device.   
[ WARN] [1475608698.460995196]: Timed out waiting for packet from device.   
[ WARN] [1475608698.559263214]: Timed out waiting for packet from device.   
[ WARN] [1475608698.657529558]: Timed out waiting for packet from device.  
[ERROR] [1475608698.657928239]: Unable to set CREG_COM_SETTINGS.

I am not able to find why is this happening. Any help will be appreciated.

Thanks in advance. Abdellah.