To clarify further (from Wikipedia): > Device certification > > Devices go through a certification process overseen by the NMEA, and are > permitted to display the "NMEA 2000 Certified" logo once they have completed > the certification process. The certification process does not guarantee data > content, that is the responsibility of the manufacturers. However, the > certification process does assure that products from different manufacturers > exchange data in a compatible way and that they can coexist on a network. > > NMEA 2000 and proprietary networks > > Several manufacturers, including Simrad, Raymarine, Stowe, the Brunswick > Corporation and Mastervolt, have their own proprietary networks that are > compatible with or akin to NMEA 2000. Simrad's is called SimNet, and > Raymarine's is called SeaTalk NG. Stowe's is called Dataline 2000. > Brunswick's is called SmartCraft. Some of these, such as SimNet and Seatalk > NG, are a standard NMEA 2000 network but use non-standard connectors and > cabling; adapters are available to convert to standard NMEA 2000 connectors, > or the user can simply remove the connector and make a direct connection.[2] > > Trademarks > > The term "NMEA 2000" is a registered trademark of the National Marine > Electronics Association. Devices which are not "NMEA 2000 Certified" may not > legally use the NMEA 2000 trademark in their advertising. > The italics/underlining are mine. Note the line in the first paragraph: just because a device is NMEA2000 certified, it doesn’t necessarily have to recognize all PGNs.
In the second paragraph, note that SeaTalkNG is basically just a repackaged NMEA2000 bus, but with non-standard connectors. Part of the reason for this is that Raymarine added one more pin to their connectors that carries the legacy SeaTalk 1 data. And this is the reason for the highlighting in the third paragraph: because of these variations from the NMEA2000 standard, Raymarine can not call SeaTalkNG “NMEA2000 certified” or even “NMEA2000 Compliant.” In reality, for most things it works just fine. Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Apr 14, 2014, at 2:05 PM, Frederick G Street <[email protected]> wrote: > Pete — both SeaTalkNG and NMEA2000 use the same data rate, on a CANBUS system. > > As far as accuracy goes, if I recall correctly it seems like you had a bad > experience with data translation, where a particular NMEA2000 PGN wasn’t > getting translated to SeaTalkNG. As Raymarine has updated its firmware, > those issues have pretty much disappeared. > > Fred Street -- Minneapolis > S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > > On Apr 14, 2014, at 1:58 PM, Pete Shelquist <[email protected]> > wrote: > >> “But it talks NMEA2000 pretty well”….if you’re not concerned with refresh >> rate and accuracy
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