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When the two network termination resistors are removed, and the power tap is connected. Turn off the NMEA 2000 network power, remove the two terminating resistors (120Ω)ġ) Proceed to measure each wire combinations (white/red, white/blue, blue/red, etc.) and verify that no shorted wires readings show on the DVOM. The next few steps will require the use of a Digital Volt/Ohm Multi-Meter (DVOM). The pin assignments for NMEA 2000 Micro, Mid, and Mini size cabling is as follows:įirst, visually check the following items on your NMEA 2000 network:ġ) All connections are properly seated and secured in the NMEA 2000 network.Ģ) The NMEA 2000 network has a fused link connected to the Power Tap teeģ) (If you're using a Micro/Mid yellow power tap, verify that the +12VDC connection is the brown and white wires, and the blue, gray, and black wires are all connected to DC- or your DC Ground).Ĥ) Verify the NMEA 2000 network has two terminating 120Ω resistors connected on opposite ends of the entire network. You should always perform the following steps to ensure the cabling concerns are excluded before diagnosing detected anomalies on your operational NMEA 2000 network. The next steps will help identify potential cabling issues before component damage can occur. This article's purpose is to cover the basic diagnosis using a Digital Voltage/Ohm Meter (DVOM) to systematically check all connections of your NMEA 2000 network are trouble free. The N2KMeter is the official technician's assistant to quickly locate NMEA 2000 network issues. The N2KMeter can also provide a real-time detection of powered device communication issues such as excessive error frames, bit timing anomalies, device level bandwidth usage, and more. Maretron recommends using an N2KMeter to properly check NMEA 2000 network health when powered and devices are operational. How do I check the health of my NMEA 2000 cabling before powering my network? - Print View How do I check the health of my NMEA 2000 cabling before powering my network?