Copyright © 2011 NMEA

Dealer Certification Section 3: Finalizing the Network Connecting to Other Data Sources Network Setup Troubleshooting Copyright © 2011 NMEA

Connecting to Other Data Sources: -NMEA 2000 to NMEA 0183

NMEA 2000 GPS information is sent to VHF radio for DSC broadcast

DSC VHF

NMEA 2000 0183 Gateway

Connecting to Other Data Sources: -NMEA 0183 to NMEA 2000 Gateways  Gateways can convert this data bi-directionally – NMEA 0183 to 2000 and NMEA 2000 to 0183

 Important for older vessel installations – – – –

Existing & functioning NMEA 0183 installation on-board Upgrading some (but not all) electronics on-board Important data may only be available via NMEA 0183 EX- New NMEA 0183 Heading sensor installed last month • This information that is needed on N2k network

 Most DSC VHF Radios have NMEA 0183 I / O – Allows for DSC and AIS information on NMEA 2000

Connecting to Other Data Sources: -NMEA 0183 to NMEA 2000

NMEA 2000 0183 Gateway

NMEA 0183 Multiplexer

NMEA 0183 Wind Data

Connecting to Other Data Sources: -NMEA 2000 to NMEA 0183 Gateways  The gateway translates the NMEA 0183 data stream to a corresponding PGN.  These translated PGN’s will show up on the network.  NMEA 0183 device will not appear on the network, but the gateway does because it has a NMEA 2000 product code.

Connecting to Other Data Sources: -NMEA 2000 to Computers

NMEA 2000 USB Gateway

Connecting to Other Data Sources: -NMEA 2000 to Computers --USB Gateways  Sends NMEA 2000 data to a PC via USB connection.  Ideal for bringing data to Marine Software Programs – Device calibration- Transducer depth, speed, & temp offsets

 For use with NMEA 2000 diagnostic PC Programs. – Analyze power distribution & PGN transmissions

 Update firmware to NMEA 2000 devices on network. – Not all manufacturers support this feature

Connecting to Other Data Sources: -Engine Data on NMEA 2000 Bus  Engine info to displays  GPS info to engine

Certified Gateway

Connecting to Other Data Sources: -Engine Data on NMEA 2000 Bus

NMEA 2000 Certification is Pending

SmartCraft Gateway & Cable

Connecting to Other Data Sources: -Engine Data on NMEA 2000 Bus

J 1939 Converter

Connecting to Other Data Sources: -Engine Data on NMEA 2000 Bus  Engine manufacturers do this differently  Data protocols such as J1939 can be converted through gateways  Some manufacturers have NMEA 2000 certified products for transferring engine data – Some connect directly to the bus as a device – See website for certified manufacturers

Network Setup: -PGN’s  Stands for Parameter Group Number.  NMEA 2000’s version of an NMEA 0183 sentence – Sentence structure is not the same – NMEA 2000 is binary, NMEA 0183 is ASCII – PGN’s & 0183 sentences have NO 1 to 1 correlation

 A PGN defines the data coming from a device.

Network Setup: -PGN’s  Most NMEA 2000 products output several PGN’s.  Examples of PGN’s include Position, Heading etc.  All PGN’s are defined in the NMEA 2000 spec.  Mandatory PGN’s – Define the device characteristics and are required by each device – NMEA certifies the product to the mandatory PGN’s

Network Setup: -PGN Information – The NMEA.org website has detailed information on all released PGN’s – Easy lookup by PGN #, PGN name, or category

Network Setup: -PGN Information – The full, released PGN list with detailed information is also available as a .pdf on the NMEA.org website.

Network Setup: -PGN’s on Product Data Sheets

Network Setup: -Selecting Data On a Display  Allows a display to show various pieces of data from the network. Depth Speed Heading

Network Setup: -Viewing PGN Data On A Display

Network Setup: -Proprietary PGN’s May be used for device calibration & setup – – – –

Engine Calibration Parameters Depth offsets Water speed offsets Heading Sensor Calibration

 New, un-released PGN’s – Manufacturers can use these to get a leg up on the market in anticipation of new technology. – NMEA 2000 committee reviews, approves, then publishes

Network Setup: -Device Instances  A numerical value which can be assigned to a device  Mandatory that every NMEA 2000 device has an instance number and the ability for a user to change this number.  Allows for installers to configure the network when multiple devices are outputting the same data – Dual transducers, one in the bow, one in the stern – Dual GPS installations – Fluid levels ( Fuel Tank A, Fuel Tank B, Water tank A, etc.)

Device Instances

Holding Tank- (Instance 0)

Water Tank- (Instance 1)

Multi-Function Display

Fluid level page displays Four fluid levels

Port Fuel Tank- (Instance 4)

Stbd. Fuel Tank-(Instance 5)

Testing & Troubleshooting: -Checklist Total device network current draw does not exceed power supply current limit. Voltage drop does not exceed limits Less than 50 physical devices connected on the network. No single drop over 6m (20 ft.) Cumulative drop length does not exceed 78 meters

Testing & Troubleshooting: -Checklist (continued) Total network length does not exceed 100m (lite cable) or 250m (mid & heavy cable). Terminating resistors are on each end of the trunk line and are properly connected Network is grounded, at only one location, preferably in the center of the network All connections are inspected for loose wires or coupling nuts. Check for opens and shorts.

Testing and Troubleshooting: -Change ONE Variable at a Time!  Loose connections – Check entire network

 Voltage fluctuations & data errors – Poorly made field-attachable connectors – Open & check screw terminals & be sure heat shrink is over the shield / drain wire(bare)

 Devices not outputting specific PGN’s – Check manufacturers datasheets for PGN’s that are ON or OFF by default

 Not enough power insertion points (Power Tees) – Low power across the network due to voltage drops

Testing and Troubleshooting: -Termination Resistors  Check that termination resistors are properly connected at each end of the backbone – – – – –

Measure the resistance on the communications pair. Blue & White wires (Pins 4 & 5) 60 ohms = OK 120 ohms = missing one terminator. 40 ohms or less = extra terminators on the network.

Testing and Troubleshooting: -Terminal Strip Tester (Shop-Made)  Consists of a micro / lite male & female drop cable connected to a terminal strip  Simple way of tapping into a network  Checks can easily be performed with a meter

Testing and Troubleshooting: -With Network Power ON Pin/Signal

Measurement

(2) PWR + (RED)

Voltage Between PWR + and Pin (3) PWR- (Ground)

Nominal Tolerance Value 12 V to 13.84V

≥ 9 V to ≤ 15.75 V

Testing and Troubleshooting: -With Network Power OFF Pin/Signal

Measurement

(5) CAN-H (4) CAN-L

Resistance between CANH(Blue) and CAN-L(White)

Nominal Tolerance Value 60 Ω

≥ 54 Ω ≤ 71 Ω

End of Training Presentations Exam

Copyright © 2011 NMEA