Motion Reference Unit page
The motion reference unit (MRU) measures the roll and pitch movements of the vessel. Some sensor models also measure heave. The information provided by the motion sensor is used by the ME70 system to stabilize the beams.
Prerequisites
This page is not available when in Replay mode.
How to open
This page is located in the Installation dialog box. To open the page, select Installation on the Setup menu.
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Description
The Motion Reference Unit page allows you to define the data format and the communication port used to import motion information. If you use a serial port for communication, you must also define the baud rate.
Note
If you choose a serial COM port to interface the motion sensor, make sure that you do not put the same COM port to other use on the I/O Setup page.
If no COM ports are available, you must first release a port on the I/O Setup page.
Details
Port
Select which serial or LAN port you want to use for the input data. Then, select which serial or LAN port to use for the output data.
Protocol
Use this function to select which datagrams you wish to input from the motion sensor. This choice must match the output format provided by the sensor.
Baud Rate
Use this setting to specify the baud rate ("speed") for the serial communication.
Tip
The standard baud rate defined for NMEA serial line communication is 4800 baud.
Status
The current status of the sensor communication is shown. If you read "Not connected", the input from the sensor is missing.
Supported datagram formats for motion information
The ME70 system supports the following datagram format from a motion sensor:
•  Teledyne TSS1
Teledyne TSS1 is a proprietary datagram format created by Teledyne TSS Navigation Systems for heave, roll and pitch compensation. When you select this protocol, the number of sensor variables is fixed, and there is no token associated with it.
•  Kongsberg EM Attitude 3000
The Kongsberg EM Attitude 3000 is a proprietary datagram format created by Kongsberg Maritime for use with digital motion sensors. It holds roll, pitch, heave and heading information. The datagram contains a 10-byte message.
•  Furuno GPhve
Furuno GPhve is a proprietary datagram format created by Furuno (http://www.furuno.jp) to contain heave information.
•  Hemisphere GNSS GPHEV
GPHEV is a proprietary datagram format created by Hemisphere GNSS (https://hemispheregnss.com) to contain heave information.