Kongsberg Simrad MF90, Installation Manual

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Setting up the input from a motion reference unit (MRU)
The information from a motion reference unit (MRU) (normally heave, roll and pitch
information) is imported into the MF90 system to increase the accuracy of the echo
data. The MF90 system is provided with a built-in motion sensor to provide electronic
stabilization of the sonar beams. It is placed inside the Motor Control Unit. For improved
operational accuracy, an external motion reference unit (MRU) can be used.
Prerequisites
This procedure assumes that:
• You have a vacant interface port on your Processor Unit.
• You are familiar with NMEA and other relevant datagram formats.
• You know how to set up the parameters for serial and local area network (LAN)
communication.
• The interface port is set up with the correct communication parameters.
• The MF90 system is turned on and operates normally.
• The new sensor is physically connected to the MF90 system using a serial or network
cable. The sensor is turned on and in normal operation.
Neither tools nor instruments are required.
Context
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 MF90 system to stabilize the beams.
Note
This task is only applicable is you are using an external motion reference unit on your
MF90 system.
Procedure
1 Connect the motion sensor system to an available communication port on your
computer.
This is described in the Cable layout and interconnections chapter. Observe the
applicable requirements related to cabling. Make sure that the total length of the serial
line cable does not exceed approximately 50 meters. If a longer cable is required,
you may need to use buffer amplifiers.
If the computer is not fitted with a suitable serial line connector, use a USB-to-serial
converter. Several types are commercially available. Note that most USB-to-serial
Setting to work