![]() ![]() 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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