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venus-os:mfd-raymarine [2021-12-09 09:49]
mvader [7. NMEA 2000]
venus-os:mfd-raymarine [2021-12-09 19:21]
mvader [7. NMEA 2000]
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 === Raymarine only: data instances need to made unique === === Raymarine only: data instances need to made unique ===
  
-If there are more than 1 (for example) SmartShunts in the NMEA2000 network, or a Solar Charger and a SmartShunt, then the Data instances of the Victron PGNs related to DC power need to changed to make each data instance unique.+If there are more than 1 (for example) SmartShunts in the NMEA2000 network, or a Solar Charger and a SmartShunt, or any other device that transmits the same type of PGNs, then the Data instances of those PGNs need to changed to make each data instance unique
 + 
 +Typically this concerns the Battery instance, used in the Battery Status and DC Detailed PGNs.
  
 See here for how to do that: [[https://www.victronenergy.com/live/ve.can:changing_nmea2000_instances|Changing NMEA2000 Instances]], section Data instances. This requires an [[https://actisense.com/products/ngt-1-nmea-2000-to-pc-interface/|Actisense NGT-1 NMEA to USB interface]]. See here for how to do that: [[https://www.victronenergy.com/live/ve.can:changing_nmea2000_instances|Changing NMEA2000 Instances]], section Data instances. This requires an [[https://actisense.com/products/ngt-1-nmea-2000-to-pc-interface/|Actisense NGT-1 NMEA to USB interface]].
  
 **Note**: this requirement of data instances being globally unique for a PGN is specific to Raymarine. Other brands do not require this. And, although perhaps besides the point, also the NMEA2000 standard does not require it. More specifically, it says: "Data instances shall be unique in the same PGNs transmitted by a device. Data instances shall not be globally unique on the network.". **Note**: this requirement of data instances being globally unique for a PGN is specific to Raymarine. Other brands do not require this. And, although perhaps besides the point, also the NMEA2000 standard does not require it. More specifically, it says: "Data instances shall be unique in the same PGNs transmitted by a device. Data instances shall not be globally unique on the network.".
venus-os/mfd-raymarine.txt · Last modified: 2022-01-07 14:42 by mbosma