4.1.2 GENERAL SETTINGS & SETUP TAB
Set PC Communication
Sets the communication settings used by the configuration software to connect and communicate
with the motion sensor.
IMU Information
Shows information about motion sensor IMU type, mounting orientation, serial number, IMU
firmware, IMU Hardware, Aiding and Remote Heave/Lever Arm.
IMU Output Values
Shows data sent from the motion sensor in real time. Note the motion sensor does not output any
numerical data during the first minute after power up.
Physical Mounting Offsets/Alignments
The mounting offsets are used to fine tune the physical alignment differences to the vessel
coordinate system and the motion sensor coordinate system. The offsets entered rotate the IMU
coordinate system. Try to align the motion sensor as well as possible physically before adjusting the
offsets electronically. The axis alignment is very crucial to achieve accurate angle output from the
motion sensor, where a misalignment in the Z axis will introduce an error between the roll and pitch
readings.
The offsets are set by entering the values in degrees for the roll, pitch and the Z axis. Note that the
offsets are related to the attitude of the vessel and not the current reading of the motion sensor. For
example, the Z axis offset is to be used to align the bow notch of the motion sensor mounting plate
with the vessel fore aft axis and is not to remove an offset in the yaw reading from the motion sensor
output.
If the vessel is perfectly aligned with the horizon as for example in a dry dock, pressing the Set to
Zero Position button in the configuration software will read the current IMU inclination and set the
roll and pitch offsets. The Z axis offset needs to be entered manually.
The Clear Offsets button will enter 0 offset for the roll, pitch and Z-axis values.
Axis Inversion
Enables the sign inversion of the output signals from the motion sensor. See Section 3 for
information about SMC rotational definitions.
Mounting Orientation
Is only available if the Motion sensor has been calibrated for sideways mounting orientation. See
chapter 3.2 for more information about the mounting orientation options.
IMU Output Coordinate System
The motion sensor can be set to output its data in the earth coordinate system or in the IMU
coordinate system.
Earth Coordinates without earth G in Acc; In this configuration, the motion sensor will use the earth
horizon as the coordinate system for the angular and acceleration output. The acceleration will not
include the earth gravity as part of the value.
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