N2KMeter NMEA 2000® Diagnostic Tool User's Manual
Contents
1. 5 1 Viewing Measurements Each selector switch position accesses a different bus measurement and each supports several different measurement types Pressing cycles the display through the different measurements available at each switch position Some measurements allow a detailed view for each Node Address Press OR to cycle through the active Node Addresses Press AND together to return to the overall network view 5 2 Display Lock To lock measurements for offline viewing move the lock switch to the amp 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 amp position and the batteries are good even if the meter is turned off 5 3 Resetting Min Max Measurements The N2KMeter is reset Min Max and other stored measurements cleared when the Lock switch is moved to the Run position and when the power switch is turned On while the Lock switch is in the Run position You may reset stored measurements by either turning the meter off and on again or by moving the Lock switch to amp and back to Run Page 4 of 28 Revision 1 1 Maretron 6 Display The N2KMeter LCD display includes a large 3 digit display as well as 17 other indicators that are shown in the following diagram 2 O O O eo w MIN MAX Jal Network Node Address node or N2KMeter switch setting number A2. a NET H L Diff V deals with Pr these two wires NET L aT blue amp NET H white Revision 1 1 Page 21 of 28 Maretron 15 CAN Signal Thresholds Switch Positions 9 12 Thresholds Switch NET H L R Voltage High Fault amp 8 50V NET H L R Voltage High Warning 7 00V NET H L R Voltage Low Warning 2 00V NET H L R Voltage Low Fault 3 00V Switch NET H D Voltage High Fault amp 10 00V NET H D Voltage High Warning 8 50V NET H D Voltage Low Warning 1 25V NET H D Voltage Low Fault amp 2 25V Switch NET L D Voltage High Fault amp 7 195V NET L D Voltage High Warning 6 25V NET L D Voltage Low Warning 3 50V NET L D Voltage Low Fault amp 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 voltage of the signal measured to the V wire at any node is too high or too low bits may not be received correctly The N2KMeter measures each of the key NET H NET L and Differential voltages and if the readings are too high or low the N2KMeter indicates a warning or fault Display What it means Recessive bus voltage can not be measured because the bus is stuck dominant or CAN wires are flipped 0 Dominant bus voltage can not be measured because there is no bus activity Page 22 of 28 Revision 1 1 Maretron 16 NMEA 2000 Glossary Bandwidth NMEA 2000 like other se
3. Maretron N2KMeter NMEA 2000 Diagnostic Tool User s Manual Revision 1 1 Copyright 2004 Maretron LLC All Rights Reserved Maretron LLC 9034 N 23 Ave 13 Phoenix AZ 85021 7850 http www maretron com Maretron Manual Part M000701 N2KMeter User s Manual os Table of Contents GENea oa hastens ani tasucewtnatenns batanas Sbat sd bain late basa batehaetuneseacsuansanniwanesusaensad wind alnatandolanheaadadalnesatacat 1 Mem WER GUICHONetccaaiantcenscnaiagcanecseacsascseeancarcsen cena S nae ene eae 1 t2 WHCGLUPC Size veswadvosaieigoobsesiareboeniaveienabneaieiaeeniedecenlesmeuaianunnbannniarimininrmimianreenels 1 IVS CAM AO Miscesacesaeeteicancanscca ms canttan Suck jucnstguakgeskseorsask eee 1 aed UDAC KNN O OX Aen een eae enn ren ne S 1 ES ENUIS or ane ee E PvE RnR er eT mC ROE a one Ee ere 2 2A DANCES rena a EE E T 2 3 2 PULOSEAICIV WIOGS ranea OAE 2 3 3 NMEA 2000 Cable are stecatacsearsaccteatncate tieactecineel eet daha atti ncteint luke ta eben tte 2 FOW OUSE Og gale 010 ke Renee sence ern ens Seen ene ne ene ee ene eae en Tee 3 WISIAG TC LINZINIVICLC orner A A 4 Sf VICWING WICASUFEMEMS ice cen sccncecssadsantxousensduadcunsdecdicenadeoddussdusanedeataweedeatiacedcassameddaesautes 4 OZ DISDIAY LOCK caceccescaeasidenndsandanadaandssad dandecaedandscntdaadais2dandacntdendacndeaadaandccacnantdeadsandecceaiatat 4 5 3 Resetting Min Max MeaSurements ccccccceccsecceeece cece eeeeeeeeeceeeseeseeee
4. Similarly the NET 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 from each node s point of view the signal voltages don t really change but the difference in NET C makes it look that way Intermittent factors such as external interference variations in network load current and electrical noise internal to nodes also contribute to CMV Collectively these intermittent factors are called noise Total CMV is critical to network health N2KMeter measures total CMV over time and records the maximum To measure worst case total CMV leave the N2KMeter connected to the network for an appropriate period of time one voyage one watch one day Thresholds CMV High Fault 5 5V CMV High Warning 25V Page 16 of 28 Revision 1 1 Maretron Notes About Common Mode Voltage CMV N2KMeter s CMV measurements are not affected by where on the network you take the measurement DC CMV problems are typically caused when devices draw more current than expected or when cable resistance is higher than expected too much cable or a combination of both CMV problems can be intermittent since few devices have a constant load current For amp CMV levels we suggest Check for devices that might be drawing more current than you expect Verify your network design with special attention to cable le
5. 0V Low Voltage Fault amp 2 5V 10 1 About NMEA 2000 Shield Voltage The NMEA 2000 specification requires that the shield and NET C be connected together at the power supply This has the following effects e A correctly connected shield has no current flow in it and is at the same voltage grounded power supply NET C throughout the system e Current flow in NET C causes a voltage rise in NET C e Rising NET C voltage causes an apparent negative shift in the shield voltage when measured relative to NET C e Since the maximum allowable voltage drop in NET C is 2 5V the negative shift in shield voltage is between 2 5V and OV Systems connected in accordance with the NMEA 2000 installation guidelines have a normal shield voltage between 2 5V and OV Page 12 of 28 Revision 1 1 Maretron For shield voltage levels we suggest e Make sure the shield and NET C are connected to each other and to earth ground at the power supply very important e Check for shorted or open shield wiring e Check that your shield wire is actually grounded correctly it s so important you check it twice e The N2KMeter displays OL if the shield is not connected or if the voltage is high Shield voltage measures the voltage on the shield wire bare relative to NET C P A black Revision 1 1 Page 13 of 28 Maretron 11 CAN Primer NMEA 2000 is based on the CAN protocol A fundamental understanding of CAN will help you take fu
6. N2KMeter uses unique technology to accurately determine which node was attempting to transmit when a bus error occurs Display What it means D 250 Real time error rate of 14 bd IS errors second Minimum bus error rate on whole network since N2KMeter was connected to the network or reset HOL 0 Maximum bus error rate on the whole G2 network since N2KMeter was connected or reset a lt 3 network since the N2KMeter was gt Incremental error count on the entire S connected or reset 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 attributed to specific nodes are not included in node measurements It is common for the sum of per node results to be less than the overall network values Thresholds Error Rate High Fault amp 15 Is Error Rate High Warn 1 s Page 6 of 28 Revision 1 1 Maretron What to do when you see or e Press or to identify the device s with higher error rates than other nodes calculate the ratio of error rate to frame rate of suspect nodes and check for above average ratios Devices with above average error ratios should be investigated further e Check the other measurements and investigate the suspect device s for faults consistent with the observed symptoms Some techniques you can use are o Replace the device and or cabling o Temporaril
7. authority to operate the equipment Industry Canada This Class A digital apparatus complies with Canadian ICES 003 CE Marking of this equipment with the symbol CE indicates compliance with European Council Directive 89 336 EEC The EMC Directive as amended by 92 31 EEC and 93 68 EEC Note To maintain compliance with the limits and requirements of the EMC Directive it is required to use quality interfacing cables and connectors when connecting this device 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 1997 including amendment A1 1998 Electrical equipment for measurement control and laboratory use EMC requirements Warning This is a Class A product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures Caution This equipment is neither designed for nor intended for operation in installations where it is subject to hazardous voltages and or hazardous currents 19 Cables The N2KMeter is designed for use with the supplied cable or the following Maretron replacement cable M420 0031 Revision 1 7 Page 25 of 28 Maretron 20 Hexadecimal to Decimal Conversion Table Decimal Decimal Decimal Decimal Page 26 of 28 Revision 1 1 21 Specifications Environment Storage Tempera
8. reading description as shown below LCD Display Push the Advance button Description The minimum shield voltage recorded since the N2KMeter was plugged in or reset is 1 5V of times to push the advance button after moving the selector switch to display this measurement 250 a TUF Q Displays the maximum frame rate per second on the network since the G5 N2KMeter was plugged in or reset Dam 1 Daal Dal Viewing measurement for this device You can view this measurement for each active device Node by pressing the or buttons Address Pressing and at the same time displays the overall network measurement again The measured value exceeds the positive or negative input range Sign indicates negative over range No measurement taken see additional details for specific measurements NOTE Node Addresses are displayed by the N2KMeter in hexadecimal notation Some network design specifications may refer to node addresses with decimal notation Please refer to the conversion table in Section 20 on page 26 to convert between the two notations Revision 1 7 Page 3 of 28 Maretron 5 Using the N2KMeter NN if LCD Display Pushbuttons Next Measurement Ep Next Node Address S Previous Node Address Return to Network View push at the same time Selector Switch
9. specifications samples descriptions or illustrations shall not constitute any breach of Maretron s limited warranty Warranty Return Procedure To apply for warranty claims contact Maretron or one of its dealers to describe the problem and determine the appropriate course of action If a return is necessary place the product in its original packaging together with proof of purchase and send to an Authorized Maretron Service Location You are responsible for all shipping and insurance charges Maretron will return the replaced or repaired product with all shipping and handling prepaid except for requests requiring expedited shipping i e overnight shipments Failure to follow this warranty return procedure could result in the product s warranty becoming null and void Maretron reserves the right to modify or replace at its sole discretion without prior notification the warranty listed above To obtain a copy of the then current warranty policy please go to the following web page http www maretron com company warranty php Page 28 of 28 Revision 1 1
10. voltage signals indicate the difference between the minimum and maximum values within a specific interval Ripple A regular repeated deviation from the mean voltage of a power or signal conductor Terminator 1 A resistor connected at the end of a transmission line network cable to prevent signal reflections caused by impedance mismatches NMEA 2000 requires two 120 ohm terminators one at each end of the network NMEA 2000 terminating resistors also define the recessive state of the network by ensuring that NET H and NET L return to zero differential after a dominant bit Transceiver A transceiver is a circuit typically a chip that converts digital bits to from the differential voltages on the network cable Transceiver is a contraction of transmitter and receiver Transient A temporary deviation from the mean voltage of a power or signal conductor Revision 1 7 Page 23 of 28 Maretron 17 Switch Settings Bus Battery On Battery Only Off Meter J L Alarm Power sound The N2KMeter has two configuration switches located in the battery compartment The Meter Power switch on left selects between bus battery power powered by bus when available and battery only power Selecting battery only power eliminates the possibility of inadvertently contributing to common mode voltage problems on extremely long networks but limits the N2KMeter use to about 7 hours on fresh batteries The Alarm Sound switch on right enables and dis
11. 15 75V Low Voltage Warning 10 0V Low Voltage Fault 9 0V High P P Voltage Fault 5 0V High P P Voltage Warning 2 0V For Bus Power Voltage Levels We Suggest e Check your power supply for proper installation and correct output voltage under load e Are your trunk drop cables too long e Is one or more of your devices drawing too much current For amp P P noise Levels We Suggest e Check for output devices containing relays or power electronics powered from the network they shouldn t be e Check for network cables routed too close to strong sources of interference e Check for aging network power supply with output ripple increasing over time e f you suspect an intermittent cable or connector shake bend or twist the suspected cable and or connector while watching the P P measurement for changes up or down Bus Power measures voltage levels on these two wires NET C black and NET S red Revision 1 1 Page 11 of 28 Maretron 10 Shield Voltage Switch Position 5 The N2KMeter measures live minimum and maximum DC shield voltage between shield and NET C Display What it means Current shield voltage is 1 4V The minimum shield voltage recorded since the N2KMeter was plugged in or reset is 1 5V The maximum shield voltage recorded since the N2KMeter was plugged in or reset is 1 2V Thresholds High Voltage Fault amp 1 0V High Voltage Warning 0 3V Low Voltage Warning 2
12. WECO UNO osha eeeire enone ne E a een ene eee ee etre eee eee ee 24 CO MINCAUONS arren r a AAT 24 Cea EE A A E E AE A E EAT STATTA EEEE TAIT E TEE AT TEE EPE EET 25 Hexadecimal to Decimal Conversion Table cccccccccccecceeeceeeceeceeeseeseeesueseeseeeseeeaes 26 SPECON sacraarits cents cca E AA A ae eo 2 TS RACIE 6 010 9 Queer meer anne ee herein A an ci eee ee ieee ene ee Ree eT eR 2 Maretron 90 Day Limited Warranty osisssa a E 28 Page Revision 1 1 Maretron 1 General 1 1 Introduction Congratulations on your purchase of the Maretron N2KMeter The N2KMeter is a diagnostic tool for NMEA 2000 networks that allows users to validate NMEA 2000 network compatibility and operations during installation of a device or complete system and diagnose possible network flaws or failures that occur on an operational network Please read carefully and follow these instructions for usage of the Maretron N2KMeter in order to ensure optimal performance and accurate measurements 1 2 Features The N2KMeter uses a patented integrated intelligence technique to Summarize multiple NMEA 2000 network operational variables into a single health index To a service technician it s a guru in a box providing a detailed reading 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 no
13. ables the beep on error transient feature With this feature enabled the N2KMeter beeps each time a bus error or transient occurs when the selector switch is in the corresponding position 18 Certifications LISTED MEASURING AND TESTING EQUIPMENT G UL 1WA4 This device meets or exceeds the requirements of the following standard s UL3111 1 Can CSA C22 2 LL 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 2 this device must accept any interference received including interference that may cause undesired operation NOTE This equipment has been tested and found to comply with the limits for Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Page 24 of 28 Revision 1 1 Maretron Warning Changes or modifications not expressly approved by Maretron could void the user s
14. ach problem measurement the N2KMeter indicates the measurement 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 Make sure the Lock switch is in the Run position and turn the selector switch to AutoSearch 2 If you see all measurements are within limits 3 If you see or then read the display like this Switch setting lt Setting gt lt MIN gt or lt MAX gt and or lt P P gt is close to or Exceeds the spec limits Then press and repeat the process for the next bad marginal value To get more detail turn the selector switch to the indicated position and use the buttons and to access related measurements 3 3 NMEA 2000 Cable NMEA 2000 cable has five wires inside Each has a specific purpose that is referenced in this manual NET L blue NET H white messages Shield messages NET C black NET S red 9round power Page 2 of 28 Revision 1 1 Maretron 4 How to use this manual The N2KMeter has a large selector switch with 12 different positions For each switch position you will find a section in this reference manual explaining the measurements available and suggested actions and or remedies if your network is not healthy In each section you ll find a diagram showing the display button push and display
15. age drop in the cable is the primary cause of the voltage shift illustrated above Noise induced in the data wires also contributes to the voltage offset lf the combination of DC common mode voltage and induced noise causes the signal voltages to exceed the transceivers capabilities bit errors are more likely to occur Six separate CAN voltage measurements are essential to rapid troubleshooting The N2KMeter accurately measures these voltages as defined in the next diagram C NET H Revision 1 1 Page 15 of 28 Maretron 12 Common Mode Voltage Switch Position 6 The N2KMeter measures the worst case total Common Mode Voltage CMV for your network including DC CMV and noise Display What it means Worst case total CMV recorded since the N2KMeter was plugged in or reset is 1 33V Common Mode Voltage cannot be determined because there is no bus activity 12 1 What is Common Mode Voltage Common Mode Voltage is an incidental voltage that is common to both signal conductors in a differential transmission system CMV manifests itself as a shift in signal voltage without any change in differential voltage Excessive CMV may cause signal voltages to exceed the capabilities of transceiver chips ultimately resulting in communication errors The primary component of CMV is voltage drop in the power conductors The cable resistance causes the NET S voltage to drop from 12 VDC with increasing distance from the power supply
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17. f V D NET HV D NET LV D 12 What it means Minimum NET H L dominant voltage x1 differential since the N2KMeter was plugged in or reset is 1 00V Maximum NET H L dominant voltage differential since N2KMeter was plugged in or reset is 1 76V Dominant differential bus voltage can not be measured because there is no bus activity Thresholds Diff D Voltage High Fault 3 00V Diff D Voltage High Warning 2 75V Diff D Voltage Low Warning 1 45V Diff D Voltage Low Fault amp 1 20V 14 1 What is Dominant NMEA 2000 messages consist of 1 s and 0 s The dominant state of the bus where the differential voltage between NET H and NET L is around 2V represents the logical value O 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 between NET H and NET L for dominant bits on the network and if the difference is not within acceptable limits N2KMeter indicates a warning or a fault Page 20 of 28 Revision 1 1 Maretron For NET HIL differential dominant voltage levels we suggest e Check for shorts and opens on the NET H and NET L wires e 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 e Disconnect nodes one at a time or temporarily split the network to check for faulty transceivers or cables
18. illivolts A recessive differential voltage that is not sufficiently close to zero may be misinterpreted by a transceiver as a dominant bit resulting in communication errors Thresholds Diff R Voltage High Fault 0 08V Diff R Voltage Low Fault 0 18V Page 18 of 28 Revision 1 1 Maretron 13 2 What is recessive NMEA 2000 messages consist of 1 s and O s The recessive state of the bus where the differential voltage between NET H and NET L is close to zero represents the logical value 1 opposite from what you might expect The bus is always in the recessive state except when a node is transmitting The N2KMeter measures the 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 HIL differential recessive voltage levels we suggest e Check for shorts and opens on the NET H and NET L wires e Check for a missing or bad terminator should be two 120 ohm terminators from NET H to NET L one at each end of the network e Disconnect nodes one at a time or temporarily split the network to check for faulty transceivers or cables oe NET H L Diff V deals with se these two wires NET L aT blue amp NET H white Revision 1 1 Page 19 of 28 Maretron 14 NET H L Differential V Dominant Switch Position 8 NET H L differential shows you the difference between NET H and NET L for dominant bits NET H L dif
19. ll advantage of the N2KMeter s features and significantly improve your ability to diagnose network problems quickly CAN messages are transmitted as a difference in voltage between two separate wires NET H white and NET L blue Differential transmission helps CAN and NMEA 2000 to operate well even with high levels of external interference i e from sources like winch motors radars etc Here s what you might see if you captured CAN signals on an oscilloscope NK Individual wires include Differential receiver cancels data noise noise and extracts data signal Differential Signal NET H NET L CAN signals have two states dominant 0 and recessive 1 The transceiver in each NMEA 2000 node determines whether a signal is a 1 or a 0 based on the differential voltage between NET H and NET L Dominant Recessive D R NET H NET L Recessive vominant Differential Differential Because the transceiver subtracts the NET H and NET L signals to determine the bit values any noise induced in the cable the same noise is induced in both wires is cancelled Transceiver chips require NET H and NET L voltages to be within specific limits otherwise a dominant 0 might be misinterpreted as a recessive 1 or vice versa resulting in errors Page 14 of 28 Revision 1 1 Maretron These out of range signals could be misinterpreted ae ae Good signal DC common mode voltage caused by volt
20. lusive remedy and Maretron s sole obligation hereunder provided product is returned pursuant to the return requirements below shall be limited to the repair or replacement at Maretron s option of any product not meeting the above limited warranty and which is returned to Maretron or if Maretron is unable to deliver a replacement that is free from defects in materials or workmanship Purchaser s payment for such product will be refunded Maretron assumes no liability whatsoever for expenses of removing any defective product or part or for installing the repaired product or part or a replacement therefore or for any loss or damage to equipment in connection with which Maretron s products or parts shall be used With respect to products not manufactured by Maretron Maretron s warranty obligation shall in all respects conform to and be limited to the warranty actually extended to Maretron by its supplier The foregoing warranties shall not apply with respect to products subjected to negligence misuse misapplication accident damages by circumstances beyond Maretron s control to improper installation operation maintenance or storage or to other than normal use or service THE FOREGOING WARRANTIES ARE EXPRESSLY IN LIEU OF AND EXCLUDES ALL OTHER EXPRESS OR IMPLIED WARRANTIES INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND OF FITNESS FOR A PARTICULAR PURPOSE Statements made by any person including representati
21. minal performance a good indication to repair things before they actually fail The N2KMeter then walks the user through each fault condition and its source or it can record key operating parameters for offline review Faults that can be detected by the N2KMeter include e Opens and Shorts Incorrect Topology Bad Nodes Bad Termination Improper Shield Connection Intermittent Problems Excessive Scan Rate Common Mode Voltage 2 Installation 2 1 Unpacking the Box When unpacking the box containing the Maretron N2KMeter you should find the following items e 1 N2KMeter Diagnostic Tool e 1 NMEA 2000 Adapter Cable e 1 N2KMeter User s Manual Includes Warranty Statement and Registration e 2 AA Alkaline Batteries If any of these items are missing or damaged please contact Maretron Revision 1 1 Page 1 of 28 Maretron 3 Essentials 3 1 Batteries The N2KMeter requires 2 AA alkaline batteries for viewing measurements offline The N2KMeter must be plugged into a powered network to get most measurements The N2KMeter will run off NMEA 2000 network power even without batteries installed Remember to install batteries if you plan to use the Lock and offline viewing features 3 2 AutoSearch Mode AutoSearch mode saves you time by finding the network measurements that exceed acceptable limits It works by examining all measurements and then pinpointing any that exceed or are close to specified limits For e
22. ngth and load current calculations Move the power supply toward the middle of the network or toward the nodes that draw the most current Investigate adding another power supply to reduce voltage offset in NET C High levels of external interference may require you to reduce the DC CMV limit below the 2 5V recommended in the NMEA 2000 Specification to keep total CMV below 5 5V Common mode voltage deals with these three wires NET L blue NET H white and NET C black Revision 1 1 Page 17 of 28 Maretron 13 NET H L Differential V Recessive Switch Position 7 NET H L differential Recessive shows you the difference between NET H and NET L for recessive bits NET H L diff V R NET HV R NET LV R 11 Display What it means Current NET H L recessive voltage differential is 0 09V Minimum NET H L recessive voltage differential since the N2KMeter was plugged in or reset is 0 08V Maximum NET H L recessive voltage differential since N2KMeter was plugged in or reset is 0 09V Recessive differential bus voltage can not be measured because the bus is stuck dominant 13 1 Importance of NET H L Differential V Recessive Measurement Data bits O s and 1 s are transmitted as differences in voltage between the NET H and NET L wires The differential voltage measurements are essentially a measurement of signal quality The recessive differential voltage is ideally zero but typically is plus or minus a few m
23. rial networks supports a certain number of bits per second sent on the wire The actual network traffic is reported as a percentage of the theoretical maximum and is called Bandwidth The N2KMeter s measurements include bandwidth lost due to bus errors and retries but most other diagnostic tools only include successful messages in bandwidth calculations CAN NMEA 2000 is based on a low level network standard known as CAN or CANbus Other networks that use CAN include CANOpen DeviceNet and SDS Although these networks are based on CAN physical layer and upper layer protocol differences limit the use of the N2KMeter with these networks Frame Rate NMEA 2000 messages are sent in one or more CAN message structures called Frames Frame Rate is the number of these structures sent in 1 second Since one NMEA 2000 message may require several CAN frames the frame rate is not necessarily the same as the message rate Node Address Each device on a NMEA 2000 network has a unique Address a number between 0 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 notation Please refer to the conversion table in Section 20 on page 26 to convert between the two notations Noise An undesirable intermittent voltage on a network signal or power wire P P Peak to peak measurements of varying
24. short time after power up because of proprietary 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 network bandwidth without initialization messaging by resetting the maximum value switch the N2KMeter off and then back on Revision 1 1 Page 9 of 28 Maretron 9 Bus Power Switch Position 4 The N2KMeter continuously monitors the NMEA 2000 bus power quality Display What it means Current network bus voltage is 12 2V Minimum bus voltage recorded since N2KMeter was plugged in or reset is 12 1V e Maximum bus voltage recorded since N2KMeter was plugged in or reset is 12 4V 8 o Current peak to peak P P voltage transient or ripple is 0 1Vp p O e Maximum peak to peak P P voltage recorded since N2KMeter was plugged in or reset is 0 2V x 9 1 What s a Transient A transient is a short temporary deviation of the bus voltage level Every NMEA 2000 network has some level of bus power transients which is perfectly acceptable Transients in 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 Page 10 of 28 Revision 1 1 Maretron Examples of Transients 15 75V 9V Thresholds High Voltage Fault amp
25. ture Operating Temperature Humidity Maximum Limits Voltage between any two terminals Power Supply Network Power Battery Power Bus Power Voltage Measurement Range Calibrated Accuracy DC Calibrated Accuracy P P Shield Voltage Measurement Range Calibrated Accuracy CAN Voltage Measurement Range Calibrated Accuracy signal Calibrated Accuracy differential 22 Technical Support Maretron 40 C to 85 C 0 C to 40 C 5 to 90 non condensing 30 Vdc 90 mA 7 Vdc to 30Vdc 2 X AA Alkaline Batteries 2V to 26V amp reverse polarity 0 5 1 count 1 0 2 counts 10V to 1V 1 0 2 counts 5 25V to 9 98V 0 5 20mV 2 counts 1 0 20mV 4 counts If you require technical support for Maretron products you can reach us in any of the following ways Telephone 1 866 550 9100 Fax 1 602 861 1777 E mail World Wide Web support maretron com http www maretron com Mail Maretron LLC Attn Technical Support 9034 N 23 Ave Suite 13 Phoenix AZ 85021 USA Revision 1 1 Page 27 of 28 Maretron 23 Maretron 90 Day Limited Warranty Maretron warrants the N2KMeter to be free from defects in materials and workmanship for ninety 90 days from the date of original purchase If within the applicable period any such products shall be proved to Maretron s satisfaction to fail to meet the above limited warranty such products shall be repaired or replaced at Maretron s option Purchaser s exc
26. utoSearch Display Locked indicator lock switch is on Measurement displayed is acceptable Measurement displayed is marginal Measurement displayed is unacceptable Battery low stored measurements may be lost 125 Kbaud network activity detected 250 Kbaud network activity detected 500 Kbaud network activity detected Measurement unit is bandwidth Measurement unit is errors messages per second Measurement unit is volts Measurement displayed is in thousands kilo Measurement displayed is a maximum value Measurement displayed is a minimum value Measurement displayed is a peak to peak value Displayed when viewing measurements for a particular Node Address Not displayed in AutoSearch mode when the value shown in the top left corner is a switch position OAOAN OO RP WN xa e d NO oh W DN NOTE If none of MIN MAX or P P is shown then the value displayed is a live measurement or the most recent Live measurement if the lock switch is on Revision 1 1 Page 5 of 28 Maretron 7 Bus Errors Switch Position 2 The N2KMeter tracks network data transmission errors in real time and lets you know if the error rate is acceptable marginal or unacceptable Any error rate greater than zero is undesirable although your network may still function since CAN automatically retransmits after errors An error rate greater than 10 s indicates a problem that should be investigated The
27. ves of Maretron which are inconsistent or in conflict with the terms of this Limited Warranty shall not be binding upon Maretron unless reduced to writing and approved by an officer of Maretron IN NO CASE WILL MARETRON BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES DAMAGES FOR LOSS OF USE LOSS OF ANTICIPATED PROFITS OR SAVINGS OR ANY OTHER LOSS INCURRED BECAUSE OF INTERRUPTION OF SERVICE IN NO EVENT SHALL MARETRON S AGGREGATE LIABILITY EXCEED THE PURCHASE PRICE OF THE PRODUCT S INVOLVED MARETRON SHALL NOT BE SUBJECT TO ANY OTHER OBLIGATIONS OR LIABILITIES WHETHER ARISING OUT OF BREACH OF CONTRACT OR WARRANTY TORT INCLUDING NEGLIGENCE OR OTHER THEORIES OF LAW WITH RESPECT TO PRODUCTS SOLD OR SERVICES RENDERED BY MARETRON OR ANY UNDERTAKINGS ACTS OR OMISSIONS RELATING THERETO Maretron does not warrant that the functions contained in any software programs or products will meet purchaser s requirements or that the operation of the software programs or products will be uninterrupted or error free Purchaser assumes responsibility for the selection of the software programs or products to achieve the intended results and for the installation use and results obtained from said programs or products No specifications samples descriptions or illustrations provided Maretron to Purchaser whether directly in trade literature brochures or other documentation shall be construed as warranties of any kind and any failure to conform with such
28. y remove the device from the network to see if the errors cease e f you suspect an intermittent cable or connector shake bend or twist the suspected cable and or connector while watching the error rate for changes up or down Excessive cable lengths and faulty nodes can cause errors in the transmissions of some all other nodes Do not assume that the node s with the highest error rate is faulty Bus Errors deal with these two wires NET L blue amp NET H white Revision 1 1 Page of 28 Maretron 8 Bus Traffic Switch Position 3 The N2KMeter continuously monitors the CAN bit stream for message traffic The N2KMeter reports Bus Traffic as either network bandwidth consumed including bandwidth consumed by errors retries or bus frames per second Display What it means Current network or node bandwidth utilization 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 connected or reset Number of message frames per second on the network or node Minimum frame rate S on the network or node since the N2KMeter was plugged in or reset Maximum frame rate S on the network or node since the N2KMeter was plugged in or reset 000 99 92 000 000 Oo Thresholds Bus Traffic High Warn 90 0 Page 8 of 28 Revision 1 1 Maretron NOTE NMEA 2000 networks tend to produce more messages for a
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