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Old 11-09-2016, 03:25   #1
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Join Date: Feb 2012
Location: Windham, NH
Boat: Sabre 38
Posts: 24
NMEA 2000 buss crash

Four years ago I installed a system that has the following; Furuno NavNet3D display, Simrad AC42/AP28 autopilot, WSO100 weather station, DST800 transducer, two NMEA2000 GPS antennas, and a furuno rs-33 display for nmea data. The system worked great for 3 1/2 years. Six months ago I installed the a75 (software v16.47) display connected to the NMEA2000 backbone. The boat has not been used that much during the past six months. The a75 displayed all the NMEA2000 data that was on the buss. Four weeks ago something strange started to happen and that was randomly the NMEA buss would crash and all the data on the buss would be gone. The system crash would happen 20-40 minutes after the system was up a running. The DST800 would report correct information when everything was running. I started to trouble shoot the system and when I removed the DST800 from the buss the data for the other devices that were on the system would come back. So I concluded that I had a bad DST800. I have sent this back to airmar for evaluation and they have told me that the DST800 is fine. The only new device o the nmea2000 buss is the a75. I have removed other devices on the buss and can not isolate the problem. What I did next was randomly changed the instance numbers for each device from there default 0 number. So now each device has a unique instance number assigned including the weather station which has 4 channels each having it's own instance number. we ran the system for 20 hours with no failures. I do not understand while this seemed to fix the problem, any thoughts.
george123 is offline   Reply With Quote
Old 11-09-2016, 18:07   #2
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Re: NMEA 2000 buss crash

Since the A75 was the last addition, and seems to correspond with when the problem started, it seems the most likely cause or trigger for the problem. The other possibility is that something else failed at the same time, but that seems much less likely.

I would guess that the A75 is transmitting data that is also being transmitted by some other device. And this has caused the issue. Changing all your device instance numbers probably worked around the issue.

Note that Maretron is the only vendor who it super sensitive to device instance numbers. They require unique instances to select between any like devices, e.g. GPSs, depth sounders, etc.. Other vendors select sources based on a combination of the device's function, model, manufacturer name, and the device's unique serial number. So they can select between two GPSs for the same model and same vendor based on the serial number. All devices instances can be zero and everything will work. But this isn't true with Maretron.

Sorry for the side bar, but N2K Instances are greatly misunderstood.
tanglewood is offline   Reply With Quote

nmea, nmea 2000

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