Raymarine a68 WiFi User Manual

3.7Systemprotocols
YourMultifunctionDisplaycanconnecttovarious
instrumentsanddisplaystoshareinformationand
soimprovethefunctionalityofthesystem.These
connectionsmaybemadeusinganumberof
differentprotocols.Fastandaccuratedatacollection
andtransferisachievedbyusingacombinationof
thefollowingdataprotocols:
•SeaTalk
hs
•SeaTalk
ng
•NMEA2000
•SeaTalk
•NMEA0183
Note:Youmayndthatyoursystemdoesnot
usealloftheconnectiontypesorinstrumentation
describedinthissection.
SeaTalk
hs
SeaTalk
hs
isanethernetbasedmarinenetwork.This
highspeedprotocolallowscompatibleequipment
tocommunicaterapidlyandsharelargeamountsof
data.
InformationsharedusingtheSeaT alk
hs
network
includes:
•Sharedcartography(betweencompatible
displays).
•Digitalradardata.
•Sonardata.
Seatalk
ng
SeaTalk
ng
(NextGeneration)isanenhancedprotocol
forconnectionofcompatiblemarineinstruments
andequipment.ItreplacestheolderSeaT alkand
SeaTalk
2
protocols.
SeaTalk
ng
utilizesasinglebackbonetowhich
compatibleinstrumentsconnectusingaspur.Data
andpowerarecarriedwithinthebackbone.Devices
thathavealowdrawcanbepoweredfromthe
network,althoughhighcurrentequipmentwillneed
tohaveaseparatepowerconnection.
SeaTalk
ng
isaproprietaryextensiontoNMEA2000
andtheprovenCANbustechnology.Compatible
NMEA2000andSeaT alk/SeaTalk
2
devicescan
alsobeconnectedusingtheappropriateinterfaces
oradaptorcablesasrequired.
NMEA2000
NMEA2000offerssignicantimprovementsover
NMEA0183,mostnotablyinspeedandconnectivity.
Upto50unitscansimultaneouslytransmitand
receiveonasinglephysicalbusatanyonetime,
witheachnodebeingphysicallyaddressable.The
standardwasspecicallyintendedtoallowfor
awholenetworkofmarineelectronicsfromany
manufacturertocommunicateonacommonbusvia
standardizedmessagetypesandformats.
SeaTalk
SeaTalkisaprotocolwhichenablescompatible
instrumentstoconnecttoeachotherandsharedata.
TheSeaT alkcablesystemisusedtoconnect
compatibleinstrumentsandequipment.Thecable
carriespoweranddataandenablesconnection
withouttheneedforacentralprocessor.
Additionalinstrumentsandfunctionscanbeaddedto
aSeaTalksystem,simplybypluggingthemintothe
network.SeaTalkequipmentcanalsocommunicate
withothernon-SeaT alkequipmentviatheNMEA
0183standard,providedasuitableinterfaceisused.
NMEA0183
TheNMEA0183DataInterfaceStandardwas
developedbytheNationalMarineElectronics
AssociationofAmerica.Itisaninternational
standardtoenableequipmentfrommanydifferent
manufacturerstobeconnectedtogetherandshare
information.
TheNMEA0183standardcarriessimilarinformation
toSeaTalk.Howeverithastheimportantdifference
thatonecablewillonlycarryinformationinone
direction.ForthisreasonNMEA0183isgenerally
usedtoconnectadatareceiverandatransmitter
together,e.g.acompasssensortransmitting
headingtoaradardisplay.Thisinformationis
passedin‘sentences’,eachofwhichhasathree
lettersentenceidentier.Itisthereforeimportant
whencheckingcompatibilitybetweenitemsthatthe
samesentenceidentiersareusedsomeexamples
ofwhichare:
•VTG-carriesCourseandSpeedOverGround
data.
•GLL-carrieslatitudeandlongitude.
•DBT-carrieswaterdepth.
•MWV-carriesrelativewindangleandwindspeed
data.
NMEABaudrates
TheNMEA0183standardoperatesatanumber
ofdifferentspeeds,dependingupontheparticular
requirementorequipmentcapabilities.Typical
examplesare:
•4800baudrate.Usedforgeneralpurpose
communications,includingFastHeadingdata.
•38400baudrate.UsedforAISandotherhigh
speedapplications.
42
aSeries/cSeries/eSeries

Raymarine a68 WiFi Specifications

General

Brand	Raymarine
Model	a68 WiFi
Category	Marine Equipment
Language	English