Raymarine i70 - Chapter 3: Getting Started

3.6Systemprotocols
Yourproductcanbeconnectedtovariousproducts
andsystemstoshareinformationandsoimprove
thefunctionalityoftheoverallsystem.
Theseconnectionsmaybemadeusinganumberof
differentprotocols.Fastandaccuratedatacollection
andtransferisachievedbyusingacombinationof
thefollowingdataprotocols:
•SeaTalk
ng®
•NMEA2000
•SeaTalk
Note:Youmayndthatyoursystemdoesnot
usealloftheconnectiontypesorinstrumentation
describedinthissection.
SeaTalkng®
SeaTalkng®(NextGeneration)isanenhanced
protocolforconnectionofcompatiblemarine
instrumentsandequipment.Itreplacestheolder
SeaTalkandSeaT alk2protocols.
SeaTalkng®utilizesasinglebackbonetowhich
compatibleequipmentconnectusingaspur.Data
andpowerarecarriedwithinthebackbone.Devices
thathavealowdrawcanbepoweredfromthe
network,althoughhighcurrentequipmentwillneed
tohaveaseparatepowerconnection.
SeaTalkng®isaproprietaryextensiontoNMEA2000
andtheprovenCANbustechnology.Compatible
NMEA2000andSeaT alkandSeaT alk2devicescan
alsobeconnectedusingtheappropriateinterfaces
oradaptorcablesasrequired.
NMEA2000
NMEA2000offerssignicantimprovementsover
NMEA0183,mostnotablyinspeedandconnectivity.
Upto50unitscansimultaneouslytransmitand
receiveonasinglephysicalbusatanyonetime,
witheachnodebeingphysicallyaddressable.The
standardwasspecicallyintendedtoallowfor
awholenetworkofmarineelectronicsfromany
manufacturertocommunicateonacommonbusvia
standardizedmessagetypesandformats.
SeaTalk
SeaTalkisaprotocolwhichenablescompatible
instrumentstoconnecttoeachotherandsharedata.
TheSeaTalkcablesystemisusedtoconnect
compatibleinstrumentsandequipment.Thecable
carriespoweranddataandenablesconnection
withouttheneedforacentralprocessor.
Additionalinstrumentsandfunctionscanbeaddedto
aSeaTalksystem,simplybypluggingthemintothe
network.SeaTalkequipmentcanalsocommunicate
withothernon-SeaT alkequipmentviatheNMEA
0183standard,providedasuitableinterfaceisused.
3.7Warningsandcautions
Important:Beforeproceeding,ensurethatyou
havereadandunderstoodthewarningsand
cautionsprovidedintheChapter1Important
informationsectionofthisdocument.
Planningtheinstallation
21