![]() ![]() It would be great if the help explained this and gave a few troubleshooting steps for values outside of the normal range. For example, dominant voltage can indicate too many or too few terminators. ![]() They don’t expand on that basic information with some troubleshooting. As you can see in the screenshots above, the current help screens are quite brief. I think Digital Yacht’s biggest opportunity to improve NAVDoctor is by expanding the help information built into the device. The more that’s documented in the report, the more useful in understanding and troubleshooting a network. I like Digital Yacht’s report so far, but hope they will add more information to the report over time. I can clearly see the value of a report documenting the state of a customer’s network when leaving their boat. The reports show the basic network configuration when a technician tested including the number of devices, busload, voltages, and error frames. Network Test Reports allow boat builders, installers, and technicians to document the state of the network when they’re done working on a boat’s network. You can go and look up the fluid types in the PGN definition, but that’s a couple of additional steps. ![]() For example, instead of showing what fluid the Fluid Level is set for, it just shows the integer identifier for that type. You could look up the CAN ID of a device in the device list, then open the PGN list and search for that CAN ID.Īdditionally, the PGN decoding doesn’t seem to be as robust as other tools I’ve used. For example, I couldn’t find a way to start at a device on the network and then view and explore all PGNs transmitted by that device. NAVDoctor’s device and PGN functions aren’t as advanced as tools like Maretron’s N2KAnalyzer. #GARMIN NMEA 2000 NETWORK FUNDAMENTALS HOW TO#The PGN list shows the PGN number, CAN source of the message, the destination, text description of the PGN, timestamp, and if NAVDoctor knows how to decode the PGN, a clickable information icon that brings up a popup showing the PGN contents. Both device and PGN displays give you a summary list and the ability to drill in and see specific information on a device or PGN. NAVDoctor displays a list of all devices and PGNs (NMEA 2000 messages) on the network. Unlike the multi-meter style N2KMeter or other tools, with NAVDoctor’s web interface, you can dig into a lot more information about the network. As the screenshots above show, not enough terminators will cause the voltage to rise above normal values while too many terminators will cause the voltage to dip below normal thresholds. But, when the network is powered up improper termination can be inferred from the dominant voltage. This means that when a powered-down NMEA 2000 network is metered for resistance across CAN-Hi and CAN-Low you should measure 60-ohms of resistance. One resistor should be at each end of the network. Like all CANBus networks, an NMEA 2000 network requires two 120-ohm terminating resistors. This error eventually popped up when testing the network with no terminators.Network health with no terminators on the network.Network health with one terminator on the network.Normal network health with two terminators on the network. ![]()
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