Simrad ST90 - Setting up the Input from a Motion Reference Unit (MRU)

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10ContinueyourworkintheInstallationdialogbox,orselectOKtocloseit.
Relatedtopics
Settinguptheinterfacestoperipheraldevices,page128
Settinguptheinputfromamotionreferenceunit(MRU)
Theinformationfromamotionreferenceunit(MRU)(normallyheave,rollandpitch
information)isimportedintotheST90toincreasetheaccuracyoftheechodata.TheST90
isprovidedwithabuilt-inmotionsensor.ItisplacedinsidetheMotorControlUnit.For
improvedoperationalaccuracy,anexternalmotionreferenceunit(MRU)maybeused.This
taskisonlyapplicableisyouareusinganexternalmotionreferenceunitonyourST90.
Prerequisites
Thisprocedureassumesthat:
•YouhaveavacantinterfaceportonyourProcessorUnit.
•YouarefamiliarwithNMEAandotherrelevantdatagramformats.
•Youknowhowtosetuptheparametersforserialandlocalareanetwork(LAN)
communication.
•Theinterfaceportissetupwiththecorrectcommunicationparameters.
•TheST90systemisturnedonandoperatesnormally.
•ThenewsensorisphysicallyconnectedtotheST90usingaserialornetworkcable.It
isswitchedonandinnormaloperation.
Neithertoolsnorinstrumentsarerequired.
Context
Amotionreferenceunit(MRU)measuresthevessel’spitchandrollmovementsinthe
sea.TheinformationprovidedbythemotionsensorisusedbytheST90tostabilizethe
beamsandtheechopresentation.
Note
ThistaskisonlyapplicableisyouareusinganexternalmotionreferenceunitonyourST90.
Procedure
1Connectthemotionsensorsystemtoanavailablecommunicationportonyour
ProcessorUnit.
ThisisdescribedintheST90Installationmanual.
SimradST90OperatorManual