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I think the problem is that the sample code that you appear to be using is for the MicroStrain 3DM-GX2 product. The header information that you show (microstrain_3dmgx2_imu imu_node) leads me to believe that. The 3DM-GX3-25 which you have has a different data communications protocol. That protocol can be found on the Documentation tab of the product's web page at: http://www.microstrain.com/inertial/3DM-GX3-25. If the serial number of the unit is less than 9000, use the Single Byte Protocol; if the serial number is 9000 or greater, use the MIP protocol. Sample code may also be found for both the Single Byte and MIP protocols. Please contact me at bjtrutor@microstrain.com if I can provide you with direct support.