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N2KMeter

®

NMEA 2000

®

Diagnostic Tool

User’s Manual

Revision 1.3

Maretron Manual Part #: M000701

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Summary of Contents for N2KMeter

Page 1: ...N2KMeter NMEA 2000 Diagnostic Tool User s Manual Revision 1 3 Maretron Manual Part M000701...

Page 2: ...itch Position 4 11 9 1 What s a Transient 11 10 Shield Voltage Switch Position 5 13 10 1 About NMEA 2000 Shield Voltage 13 11 CAN Primer 15 12 Common Mode Voltage Switch Position 6 17 12 1 What is Com...

Page 3: ...Revision 1 3 Page 1 Revision History Rev Description 1 2 Updated Company Address 1 3 Changed cable part number...

Page 4: ...ing of network performance It summarizes NMEA 2000 network health by displaying a happy face icon indicating a healthy network a sad face indicating a serious problem or a neutral face indicating nomi...

Page 5: ...s switch position number in the upper left corner of the display Rotate the selector switch to the indicated setting to view related measurements To use AutoSearch follow these simple instructions 1...

Page 6: ...e conversion table in Section 20 on page 27 to convert between the two notations The measured value exceeds the positive or negative input range Sign indicates negative over range No measurement taken...

Page 7: ...position To erase stored values and restart bus analysis move the lock switch to Run Stored values are retained indefinitely providing the lock switch is left in the position and the batteries are go...

Page 8: ...Kbaud network activity detected 9 500 Kbaud network activity detected 10 Measurement unit is bandwidth 11 Measurement unit is errors messages per second 12 Measurement unit is volts 13 Measurement di...

Page 9: ...s error occurs Display What it means NOTE Node error measurements only include errors known to have occurred when the node is transmitting Frames with corrupt ID fields and frames that cannot be attri...

Page 10: ...onsistent with the observed symptoms Some techniques you can use are o Replace the device and or cabling o Temporarily remove the device from the network to see if the errors cease If you suspect an i...

Page 11: ...sholds Bus Traffic High Warn 90 0 Minimum network or node bandwidth recorded since the N2KMeter was plugged into the network or reset Maximum network or node bandwidth recorded since N2KMeter was conn...

Page 12: ...ietary configuration messaging With the N2KMeter you can capture this higher bandwidth usage during startup by observing the maximum reading You can also get a more realistic measurement of the actual...

Page 13: ...excess of 2V P P can contribute to node failures and communication errors in some cases and should be investigated Transients in excess of 10V P P are an indication of serious network problems Curren...

Page 14: ...r devices drawing too much current For P P noise Levels We Suggest Check for output devices containing relays or power electronics powered from the network they shouldn t be Check for network cables r...

Page 15: ...low in it and is at the same voltage grounded power supply NET C throughout the system Current flow in NET C causes a voltage rise in NET C Rising NET C voltage causes an apparent negative shift in th...

Page 16: ...at the power supply very important Check for shorted or open shield wiring Check that your shield wire is actually grounded correctly it s so important you check it twice The N2KMeter displays OL if t...

Page 17: ...Here s what you might see if you captured CAN signals on an oscilloscope CAN signals have two states dominant 0 and recessive 1 The transceiver in each NMEA 2000 node determines whether a signal is a...

Page 18: ...wires also contributes to the voltage offset If the combination of DC common mode voltage and induced noise causes the signal voltages to exceed the transceivers capabilities bit errors are more likel...

Page 19: ...C voltage increases proportionally from 0 VDC at the power supply This offset results in each node having a slightly different reference point NET C which causes an apparent shift in signal voltages...

Page 20: ...vels we suggest Check for devices that might be drawing more current than you expect Verify your network design with special attention to cable length and load current calculations Move the power supp...

Page 21: ...e is ideally zero but typically is plus or minus a few millivolts A recessive differential voltage that is not sufficiently close to zero may be misinterpreted by a transceiver as a dominant bit resul...

Page 22: ...e difference between NET H and NET L for recessive bits on the network and if the difference is not close to 0 volts N2KMeter indicates a fault For NET H L differential recessive voltage levels we sug...

Page 23: ...nd NET L is around 2V represents the logical value 0 opposite from what you might expect The bus can only be in the dominant state when a node is actively transmitting N2KMeter measures the difference...

Page 24: ...NET L wires Check for a missing bad or extra terminators should be two 120 ohm terminators from NET H to NET L one at each end of the network and no more Disconnect nodes one at a time or temporarily...

Page 25: ...w Warning 3 50V NET L D Voltage Low Fault 4 50V NMEA 2000 messages consist of 1 s and 0 s which are represented as differences in voltage between the NET H and NET L wires However if the absolute volt...

Page 26: ...and 255 This Address is known as the Node Address The number is displayed in hexadecimal notation on the N2KMeter display Some network design specifications may refer to node addresses with decimal no...

Page 27: ...ard s UL3111 1 Can CSA C22 2 CAT II 30V FCC This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and...

Page 28: ...e Refer to the cable specifications in the Maretron NMEA 2000 Network Designer s Guide for selection of cable types This device meets or exceeds the requirements of the following standard EN 61326 199...

Page 29: ...218 DA 27 1B 91 5B 155 9B 219 DB 28 1C 92 5C 156 9C 220 DC 29 1D 93 5D 157 9D 221 DD 30 1E 94 5E 158 9E 222 DE 31 1F 95 5F 159 9F 223 DF 32 20 96 60 160 A0 224 E0 33 21 97 61 161 A1 225 E1 34 22 98 62...

Page 30: ...tery Power 2 X AA Alkaline Batteries Bus Power Voltage Measurement Range 2V to 26V reverse polarity Calibrated Accuracy DC 0 5 1 count Calibrated Accuracy P P 1 0 2 counts Shield Voltage Measurement R...

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