Nmea wind data.

Allan

Allan

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Like lots of other boats we have an electronic system that has grown over the years. All but one thing works. We have B&G network instruments talking on a Nmea 0183 bus and a, recently fitted, Raymarine eS75 plotter. I think the Nmea may be converted to 2000 before feeding the plotter. Everything except the wind information is displayed on the plotter and tablet repeater down below. I suspect there maybe a problem with the information (sentence?) coming from the instrument. Is there anyway to check/change this?
Thanks in advance.
Allan
 
eh? how did that get deleted!

the es75 has a nmea0183 input built it, so it should just connect and work.

if you are feeling adventurous, with a £5 arduino uno and a laptop you could "look" at the sentances....
and/or for about £18 you could get an oscilloscope on the input! (goodle a dso138)
 
You say the B&G output may be converted to NMEA2000. The eS75 will take NMEA0183 input, so maybe best to connect that and see whether it works. B&G usually output the MWV sentence, and the eS75 can receive this.
 
Allan said:
Like lots of other boats we have an electronic system that has grown over the years. All but one thing works. We have B&G network instruments talking on a Nmea 0183 bus and a, recently fitted, Raymarine eS75 plotter. I think the Nmea may be converted to 2000 before feeding the plotter. Everything except the wind information is displayed on the plotter and tablet repeater down below. I suspect there maybe a problem with the information (sentence?) coming from the instrument. Is there anyway to check/change this?
Thanks in advance.
Allan
Click to expand...

Is there any other instrument displaying wind data?
Is your new plotter using only NMEA2000 cabling or is there a NMEA0183 connection in use?
Did you install the boat networking yourself? Is the B&G gear only NMEA0183 or is it B&G fastnet network connected, with a CPU unit collecting/driving the instruments?

There are data translators from B&G fastnet to NMEA2000. (all our boat's data is generated by B&G at fastnet level but then sent as NMEA2000 to our newer plotter. It works well)

Using NMEA Reader from Actisense (free), a USB to Serial adapter, (<£10 on Ebay) it is possible to decode and display old NMEA0183 and NMEA 2000 network data. If it exists at 0183 level - you should be able to isolate the problem.
Do you have a network diagram of your instruments to help us?
 
Many thanks for the replies. Some answers/information.
No, I didn't install the plotter etc. It was done by Greenham Regis, who made a very tidy job.
GR also fitted a Digital Yacht AIS transceiver and splitter.
The boat is in Portugal and we are going down to it in December, until then all information has to be from memory!
We have a normal B&G wind display, so this is not an enormous problem, just irritating.
I don't think the 0183 is connected directly to the plotter.
Allan
 
Allan said:
No, I didn't install the plotter etc. It was done by Greenham Regis, who made a very tidy job.
GR also fitted a Digital Yacht AIS transceiver and splitter.
Click to expand...

Did you check that it all worked after GR fitted it? Is the windspeed issue new? Or did it work after GR fitted the new kit?
 
Allan said:
Many thanks for the replies. Some answers/information.
No, I didn't install the plotter etc. It was done by Greenham Regis, who made a very tidy job.
GR also fitted a Digital Yacht AIS transceiver and splitter.
The boat is in Portugal and we are going down to it in December, until then all information has to be from memory!
We have a normal B&G wind display, so this is not an enormous problem, just irritating.
I don't think the 0183 is connected directly to the plotter.
Allan
Click to expand...

Do you know what model of display it is? (is it a remote of a CPU elsewhere - or a stand alone?)
 
pagoda said:
Do you know what model of display it is? (is it a remote of a CPU elsewhere - or a stand alone?)
Click to expand...

As I said in the first post, it is a Raymarine eS75 MFD. I would call it a standalone unit.
After reading the thread again I think the AIS may output in NMEA 2000 and GR may have converted the existing 0183 to 2000 to ensure it's all the same. I've looked on the Raymarine website and can't decide if the MFD can accept both (0183 and 2000) simultaneously.
Allan
 
Allan said:
Like lots of other boats we have an electronic system that has grown over the years. All but one thing works. We have B&G network instruments talking on a Nmea 0183 bus and a, recently fitted, Raymarine eS75 plotter. I think the Nmea may be converted to 2000 before feeding the plotter. Everything except the wind information is displayed on the plotter and tablet repeater down below. I suspect there maybe a problem with the information (sentence?) coming from the instrument. Is there anyway to check/change this?
Thanks in advance.
Allan
Click to expand...

My B&G Network wind data crashes my vyacht wifi unit so I suspect that the sentences are a bit "different" from the norm?
 
pvb said:
Did you question that with Greenham Regis? What was their response?
Click to expand...

No, I didn't mention it, we were readying the boat for the last trip across the Atlantic and it was not important. To be honest, didn't expect to have any of the instrument data on the MFD.
Allan
 
Allan said:
We have B&G network instruments talking on a Nmea 0183 bus
Click to expand...

NMEA0183 isn't a bus, it's a point-to-point serial connection.

In practice you can connect several receivers in parallel, but you can only have one transmitter on any circuit. Violation of this (or, complying with it by not not connecting something) might be the source of your problem.

I assume you won't know how it's actually wired until you visit the boat?

Pete
 
prv said:
NMEA0183 isn't a bus, it's a point-to-point serial connection.

In practice you can connect several receivers in parallel, but you can only have one transmitter on any circuit. Violation of this (or, complying with it by not not connecting something) might be the source of your problem.

I assume you won't know how it's actually wired until you visit the boat?

Pete
Click to expand...
As you can tell, I'm far from an expert on this! Are you saying it's not possible to transmit say log information and wind information at the same time? If so that would explain the situation.
As I mentioned before, you're correct, it all has to be from memory at present!
Allan
 
Allan said:
As you can tell, I'm far from an expert on this! Are you saying it's not possible to transmit say log information and wind information at the same time? If so that would explain the situation.
As I mentioned before, you're correct, it all has to be from memory at present!
Allan
Click to expand...

The eS has two input ports (NMEA0183), each port can only receive data from a single source. So you could have log data on port 1 and wind data on port 2. If you have an unused port you can connect directly to the wind instrument OUT port, but if both ports are in use this is not possible. If both ports are in use, you can connect a 0183 to N2K converter and feed wind data into the N2 network.
 
Buck Turgidson said:
Well that's disappointing to read as I have a vyacht wifi and am fitting B&G wind this winter!!! Are you using 0183 or 2000 input to the vyacht?
Click to expand...

The two main issues with the vYacht router are a) it does not convert all N2K sentences and b) it get overloaded if too many instruments are connected, otherwise it actually works fine. I used one for a couple of years and only removed it (sitting on a shelf here if anyone wants one :))because i fitted a chart plotter at the helm and no longer need the wifi to the laptop.

So the wind may work for you, if the issue above is one of overloading.
 
PaulRainbow said:
The eS has two input ports (NMEA0183), each port can only receive data from a single source. So you could have log data on port 1 and wind data on port 2. If you have an unused port you can connect directly to the wind instrument OUT port, but if both ports are in use this is not possible. If both ports are in use, you can connect a 0183 to N2K converter and feed wind data into the N2 network.
Click to expand...

True. One of the main advantages of N2K is that the data from almost as many instruments as you'd care to install can co-exist on one small cable. Individual devices negotiate their place in the network and very little is ever lost. NMEA0183 on the other hand, while it works well, is mainly a single point to point data stream.
Very few MFDs ever had more than 2 x NMEA0183 ports, and it's not unusual to dedicate one to high speed incoming 0183 data from an AIS receiver.

There are some "data combiners" which will merge 0183 data sources and make it into a combined single output.
I would recommend you feed any instruments you really need into the N2K network, via converters. Then you only need the one data cable to your MFD.
 
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