8 Setting up the input from a motion sensor

The information from a motion sensor (normally heave, roll and pitch information) is imported into the EK80 system to increase the accuracy of the echo data.

Prerequisites

This procedure assumes that:

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You have a vacant interface port on your Processor Unit.

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You are familiar with NMEA and other relevant datagram formats.

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You know how to set up the parameters for serial and local area network (LAN) communication.

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The interface port is set up with the correct communication parameters.

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The EK80 system is turned on and operates normally.

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The new sensor is physically connected to the EK80 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 sensor measures the roll and pitch movements of the vessel. The information provided by the motion sensor is used by the EK80 system to stabilize the beams.

Note

ADCP operations cannot take place without input from a motion sensor. The input must be provided on the KM Binary datagram format. KM Binary is a proprietary datagram format created by Kongsberg Maritime for general use. This format has very high resolution on timing and sensor parameters.

Procedure

Connect the motion sensor system to an available communication port on your computer.

This is described in the Installation Manual.

Open the Setup menu.

On the Setup menu, select Installation.

Observe that the Installation dialog box opens. This dialog box contains a number of pages selected from the menu on the left side.

On the left side of the Installation dialog box, select Sensor Installation.

Select the motion reference format you want to use.

Select the port you want to use (serial or LAN).

If you want to check the communication parameters, select Inspect Port.

Note

You cannot make any changes here. To change the communication parameters, use the I/O Setup page. The I/O Setup page is located in the Installation and Output dialog boxes.

If you want to check that the peripheral system is transmitting data to the EK80 system, select Monitor.

The Port Monitor dialog box provides one text box for incoming messages (Rx Data), and one for outgoing messages (Tx Data). Use these boxes and your knowledge of the data communication to investigate the datagrams. The Port Monitor dialog box is a tool for debugging purposes. It is neither required nor intended for normal operation of the EK80 system.

Type a custom name to identify the interface in other dialog boxes.

Select which datagram(s) you want to import from the sensor.

If relevant, specify a dedicated talker ID.

Provide the accurate physical location of the sensor (or its antenna) with reference to the vessel’s coordinate system.

The position of certain sensors must be defined as an offset to the Ship Origin in the coordinate system to maximize performance. These offset values are all required to allow the EK80 system to give you as accurate information as possible. The degree of accuracy offered by the EK80 system is directly related to the accuracy of the information you enter on the Sensor Installation page.

Select the offset value on the X axis (fore-and-aft direction) from the Ship Origin. Adjust with a positive value for X if the sensor is located ahead of the ship origin.

Select the offset value on the Y axis (athwartship) from the Ship Origin. Adjust with a positive value for Y if the sensor is located on the starboard side of the ship origin.

Select the offset value on the Z axis (vertical) from the Ship Origin. Adjust with a positive value for Z if the sensor is located under the ship origin.

Select Add to save the new sensor interface you have defined.

The sensor interface is added to the Installed Sensors list on the Sensor Installation page.

Select Apply and then Close to save all the parameters and close the Installation dialog box.