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  #11  
Old 02-05-2013
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

Quote:
Originally Posted by MarkSF View Post
I don't see why that would cause problems - it is fine to feed NMEA 2000 with power in more than one location (as long as the polarity is the same!) to overcome voltage drops in long cable runs.
This is not what Garmin say
From http://static.garmincdn.com/pumac/GMI_10_INST_EN.pdf Page 3
Quote:
NOTICE
If you have an existing NMEA 2000 network on your boat, it should alreay be connected to power. Do not connect the included NMEA 2000 power cable to an existing NMEA 2000 network, because only one power source should be connected to a NMEA 2000 network.
If you need to insert power into the N2K network at different segments the segments need to be insulated (not necessary on an average boat).

More on Garmin Networking and power supply here
http://static.garmincdn.com/pumac/NM...mentals_EN.pdf page 5

The GMI 10 manual is not clear on connecting the GMI 10 to NMEA 0183 and NMEA 2000 at the same time...

More one NMEA 2000 networking here http://www.maretron.com/products/pdf...on%20Guide.pdf
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  #12  
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

Oh I see, I think it's to do with noise loops.

Well some of the MFDs make a big thing of the NMEA 0183/2000 repeater function, so there must be a way to do it right (meaning they take 0183 data in, and output it in 2000 form)
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

http://static.garmincdn.com/pumac/GMI_10_INST_EN.pdf

http://static.garmincdn.com/pumac/GM...N19wxxxxxx.pdf

The plot thickens, because on the Garmin website there are two versions of the instructions. If you look at the diagrams on pages 5 / 6, the thing that has changed is, (guess what!) in the newer version the + supply is no longer connected to the GMI 10 via the NMEA 0183 connector - only to the GPS sensor.

The two manuals reflect a change to later versions of the GMI 10, which get their power via NMEA 2000. It seems that if the OP has the newer version, he is using the old, wrong, instructions.
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

Quote:
Originally Posted by MarkSF View Post
Oh I see, I think it's to do with noise loops.
Probably

Quote:
Originally Posted by MarkSF View Post
Well some of the MFDs make a big thing of the NMEA 0183/2000 repeater function, so there must be a way to do it right (meaning they take 0183 data in, and output it in 2000 form)
Lots of MFD's can translate between NMEA 0183/2000, my Furuno NN3D MFD does that.
But Garmin say that the GMI 10 can't do this (Translate)-

You also can get NMEA 2000 Gateway's like this - have one connected to my autopilot and N2K network.
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

Hi everyone and thank you for your input.

Some info: The boat is on the hard and the depth sounder gave readings at some point when pointed either to the ground below or to thick GRP sections of the boat itself (incorrect depths to be exact - probably because it gets readings through the air and not water)

In the manual I used it says that GMI 10 DOES NOT get power through the NMEA2000 network. In fact, I tried both ways, and GMI 10 DID turn on when only powered by the NMEA2000 bus. In either case the results were the same.
I will give the common ground thing a go when I get back to the boat, since it seems the only thing that makes some sense to affect normal operation by cancelling noise on the data lines and the one thing I haven't tried.

Again, thank you all for chiming in.
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

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Originally Posted by jsaronson View Post
you need to ground the power cable. put a meter on the wire going into the network to verify.
I would start here as JSARONSON suggests. Can you get a hold of Maretron's N2K Meter to test the physical cabling?



If not, if you have a DVM you should test as follows:

Maretron Support Knowledge Base :: How do I check the health of my N2K cabling before powering my network?
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

Thank you, arisatx. This document from Maretron should prove very helpful in diagnosing potential problems in the network. I'll keep a copy on the boat for reference.
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

Quote:
Originally Posted by atsakir View Post
Hi everyone and thank you for your input.

Some info: The boat is on the hard and the depth sounder gave readings at some point when pointed either to the ground below or to thick GRP sections of the boat itself (incorrect depths to be exact - probably because it gets readings through the air and not water)

In the manual I used it says that GMI 10 DOES NOT get power through the NMEA2000 network. In fact, I tried both ways, and GMI 10 DID turn on when only powered by the NMEA2000 bus. In either case the results were the same.
I will give the common ground thing a go when I get back to the boat, since it seems the only thing that makes some sense to affect normal operation by cancelling noise on the data lines and the one thing I haven't tried.

Again, thank you all for chiming in.
It appears that versions of the GMI 10 since 2008 have been powered by NMEA 2000. So either you bought some very old stock, or that's the wrong manual for yours.

I don't think depth transducers work reliably in air. Try it in a bucket of water?
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

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Originally Posted by atsakir View Post
Thank you, arisatx. This document from Maretron should prove very helpful in diagnosing potential problems in the network. I'll keep a copy on the boat for reference.
Parakalo. The Maretron field attachable connectors facilitate testing with the DVM probes. Good luck and let us know what you find.
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

I'm not convinced that there is a problem, at least with the depth transducer. They are not intended to work in air - if it ever did, that was a fluke.

It DOES sound like there is something funky about the NMEA 0183 wiring, but that might be fixed by re-wiring to the latest wiring diagram.
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