Simrad SC90, Installation Manual

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Motion Reference Unit (MRU)
In order to operate correctly, the SC90 requires input from a motion reference unit
(MRU). By default, the SC90 uses a built-in motion sensor. It is placed inside the
Motor Control Unit. For improved operational accuracy, an external motion reference
unit (MRU) may be used.
Note
Without the input from a motion reference sensor, the SC90 will not be able to
compensate for the vessel movements. This lack of compensation will prevent the SC90
from providing correct echo information.
The SC90 has been designed to match the motion reference unit (MRU) sensors
manufactured by Kongsberg Seatex. Descriptions of all available types are provided on
their website.
• https://www.km.kongsberg.com/seatex
For the motion sensor unit (MRU) to communicate with the SC90, it must support the
following interface format:
•
Kongsberg EM Attitude 3000
The 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-bytes long message.
Kongsberg Maritime may provide a suitable motion reference unit. Consult your local
dealer or agent for more information.
Motion Reference Unit (MRU) Part number In the box
Seatex MRU-D 390313 Motion Reference Unit (MRU)
Documentation
Serial line splitter
On large installations with many hydrographic systems, these systems often require the
same navigational information from a single sensor.
As an example, information such as the current depth or speed is provided as datagrams
on a serial line format. One or more serial line splitters are then used to distribute the
information from a single sensor to several different recipients.
Simrad SC90