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Old 24-01-2017, 20:26   #1
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NMEA 0183 Baud Rate

From what I've read, NMEA 0183 specifies a baud rate of 4800. I'm in discussions with an equipment vendor who has supplied a piece of kit that is set for 9600, which they say they chose "based on research".

I'd like to be on firm ground in my discussions with them so I seek advice from the knowledgable. Am I correct in assuming that most of the recreational marine electronics has used 4800?

Cheers, Graeme
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Old 24-01-2017, 20:38   #2
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Re: NMEA 0183 Baud Rate

It's 4800 or 38.4k for AIS,
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Old 24-01-2017, 20:47   #3
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Re: NMEA 0183 Baud Rate

From NMEA Directly:

NMEA 0183 Standard

The NMEA 0183 Interface Standard defines electrical signal requirements, data transmission protocol and time, and specific sentence formats for a 4800-baud serial data bus. Each bus may have only one talker but many listeners. This standard is intended to support one-way serial data transmission from a single talker to one or more listeners. This data is in printable ASCII form and may include information such as position, speed, depth, frequency allocation, etc.

Version 4.10 cancels and replaces NMEA 0183 V 4.00, published in November 2008, and constitutes a technical revision. Version 4.10 includes updates to AIS new sentences due to changes at ITU. Version 4.10 expands the GNS sentences to include Galileo. This version also includes a new wiring diagram published in collaboration with RTCM and the USCG. There some new sentences as well. It is in theory backward compatible to version NMEA 0183 2.00.

Any updates to Version 4.10 within a one-year period from the date of purchase can be downloaded at National Marine Electronics Association - NMEA or e-mailed to you at no charge. All funds are in U.S. dollars.


The NMEA 0183 Manufacturer's Mnemonic Code is provided gratis to the industry. Click here for the form

There is also a high-speed addendum to NMEA 0183 V 4.10, called NMEA 0183-HS (High Speed) Version 1.01. This standard operates at a 38.4K-baud rate. Specific sentence formats are common to both NMEA 0183 and NMEA 0183-HS and are defined in the NMEA 0183. The NMEA 0183-HS sells for $140 for members and $250 for non-members for the electronic version. A paper version is available for $200 for members and $300 for non-members, plus shipping/handling. All funds are in U.S. dollars.
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Old 24-01-2017, 22:19   #4
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Re: NMEA 0183 Baud Rate

Thanks chaps. I can now engage the vendor with more brio.
I assume version 4.10 remains 4800?
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Old 24-01-2017, 23:25   #5
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Re: NMEA 0183 Baud Rate

Pretty much any device except a pc will not take nmea at 9600 baud. All chart plotters etc will only give you 2 choices. 4800 or 38,400.

On a pc you'd probably be able to select anything
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Old 25-01-2017, 11:00   #6
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Re: NMEA 0183 Baud Rate

I had a related NMEA baud rate issue. Most of my equipment is N2K, but my VHF is NMEA0183. The VHF has DSC, and displays my position on its screen, so it is nice to have it connected to the rest of the network.

My AIS system (Vesper) does N2K to 0183 bridging of sorts. So it was not too hard to connect the two. However, the VHF would not work (and with no indication of what the error was) until I set the baud rate (in the Vesper config) to the low setting. The Vesper warns that it will not be transmitting everything (I think it said no AIS, my memory is hazy), but I recon that the VHF does not need the AIS data, only the GPS position data.

So, bottom line(s):

N2K is (in my experience) plug and play, but 0183 needs secret handshakes.

Default setup for Vesper AIS 0183 baud rate is not the expected "old" rate, but the "new" AIS-enhanced rate
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Old 26-01-2017, 00:25   #7
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Re: NMEA 0183 Baud Rate

Quote:
Originally Posted by lockie View Post
Am I correct in assuming that most of the recreational marine electronics has used 4800?
If the product has an NMEA logo you're in a good place to complain but there's plenty of products out there, particularly low cost GPS units not made specifically for the marine market which may have been produced without reference to the official standard, never mind been certified. Although "NMEA-0183" is a full stack protocol which covers baud rate, you often see the term applied only to the data format being put out.

9600 is the default serial baud rate for many computers. If the equipment you are having problems with is generally bought by people to plug into a laptop rather than marine equipment then 9600 would probably provide the least hassle for the most users.

A couple of cheap GPS devices I've bought have come set to 9600 by default but were changeable. Changing the baud rate may involve plugging the thing into a computer and sending it proprietary commands (the manufacturer should tell you what these are) but the settings should "stick" as long as the internal battery lasts
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Old 21-02-2017, 21:28   #8
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Re: NMEA 0183 Baud Rate

As a software engineer for a control head manufacturer, I can say that we try to autobaud any incoming NMEA strings at 4800 (standard NMEA), 9600, and 38400 (High Speed NMEA). 4800 used to be the standard until > 1Hz updates was wanted. Individual manufacturers went to 9600 to "cheat" the system. Later NMEA came out with the "High Speed" NMEA.
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