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Telegramformats

otherstoreceivedatasimultaneously("listeners")onthesameline.Therefore,youmust

ensurethatallproductsreceivingdataonacommunicationlineissetuptoreceivethe

sametelegram(s)thatthetransmittingproductprovides.

StandardNMEA0183communicationparameters

ThecommunicationparametersdenedforNMEA0183are:

•Baudrate:4800bitspersecond

•Databits:8

•Parity:None

•Stopbits:One

Someinstrumentswillalsoofferotherparametersand/orchoices.

NMEAsentencestructure

Thefollowingprovidesasummaryexplanationoftheapprovedparametricsentence

structure.

$aaccc,c—c*hh<CR><LF>

1“$”:Startofsentence(Hex:24).

2aaccc:Addresseld.Thersttwocharacters(aa)identiestheTalkerID,whilethe

lastthreecharactersaretheSentenceformattermnemoniccodeidentifyingthedata

typeandthestringformatofthesuccessiveelds.

3“,”:Fielddelimiter(Hex:2C).Thischaracterstartseacheldexcepttheaddress

andchecksumelds.Ifitisfollowedbyanulleld,itisallthatremainstoindicate

nodataintheeld.

4c—c:Datasentenceblock.Thisisaseriesofdataeldscontainingallthedata

tobetransmitted.ThedataeldsentenceisxedandidentiedbytheSentence

formatterintheaddresseld.Dataeldsmaybeofvariablelengths,andtheyare

precededbytheFielddelimiter.

5“*”:Checksumdelimiter(Hex:2A).Thisdelimiterfollowsthelasteldofthe

sentence,andindicatesthatthefollowingtwoalphanumericalcharacterscontain

thechecksum.

6hh:Checksum

7<CR><LF>:Terminatessentence

Proprietarytelegrams

InsomeproprietarytelegramsreceivedfromotherKongsbergMaritimeequipment,the$

characterisreplacedbythe@character.Thechecksumeldmaythennotbeinuse.

351718/C

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Simrad EK15 User Manual

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