Raymarine SPX 10 - Seatalk Autopilot System

2.5SeaTalkautopilotsystem
Theautopilotmaybeconnectedaspartofawider
networkofmarineelectronicsusingSeaTalk.
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SMARTPILOT
D10 434 -2
SeaTalk SeaTalk
SeaTalk
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1.MultifunctiondisplaywithGPS.(GPSmaybe
internalorexternal.)
2.Windanddepthinstruments
3.Autopilotcontroller
4.Autopilotcoursecomputeranddriveunit.Thismay
alsosupplypowertoSeaT alkinstrumentsandthe
autopilotcontroller.
Note:Themultifunctiondisplaywillrequireitsown
powerconnection.Itcannottakeitspowerfrom
SeaTalk.
SeaTalk
SeaTalkisaprotocolwhichenablescompatible
instrumentstoconnecttoeachotherandsharedata.
TheSeaT alkcablesystemisusedtoconnect
compatibleinstrumentsandequipment.Thecable
carriespoweranddataandenablesconnectionwithout
theneedforacentralprocessor.
Additionalinstrumentsandfunctionscanbeaddedto
aSeaT alksystem,simplybypluggingthemintothe
network.SeaT alkequipmentcanalsocommunicate
withothernon-SeaTalkequipmentviatheNMEA0183
standard,providedasuitableinterfaceisused.
NMEA0183
TheNMEA0183DataInterfaceStandardwas
developedbytheNationalMarineElectronics
AssociationofAmerica.Itisaninternationalstandard
toenableequipmentfrommanydifferentmanufacturers
tobeconnectedtogetherandshareinformation.
TheNMEA0183standardcarriessimilarinformationto
SeaTalk.Howeverithastheimportantdifferencethat
onecablewillonlycarryinformationinonedirection.
ForthisreasonNMEA0183isgenerallyusedto
connectadatareceiverandatransmittertogether,
e.g.acompasssensortransmittingheadingtoaradar
display.Thisinformationispassedin‘sentences’,
eachofwhichhasathreelettersentenceidentier.
Itisthereforeimportantwhencheckingcompatibility
betweenitemsthatthesamesentenceidentiersare
usedsomeexamplesofwhichare:
•VTG-carriesCourseandSpeedOverGrounddata.
•GLL-carrieslatitudeandlongitude.
•DBT-carrieswaterdepth.
•MWV-carriesrelativewindangleandwindspeed
data.
NMEAbaudrates
TheNMEA0183standardoperatesatanumber
ofdifferentspeeds,dependingupontheparticular
requirementorequipmentcapabilities.Typical
examplesare:
•4800baudrate.Usedforgeneralpurpose
communications,includingFastHeadingdata.
•9600baudrate.UsedforNavtex.
•38400baudrate.UsedforAISandotherhighspeed
applications.
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SPX10,SPX30,SPX-SOL