Differences

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--- ve.can:changing_nmea2000_instances [2020-04-10 00:02] – [1. Introduction] mvader
+++ ve.can:changing_nmea2000_instances [2020-06-27 21:26] – [4. Changing Instance Using Maretron N2KAnalyzer] mvader
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 === Required hardware ===
 Changing the device instance requires an usb-canbus adapter to link the CAN-bus network to your computer:
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 === Related information ===
 For more detailed information, see also the FAQ in our [[https://www.victronenergy.com/upload/documents/Whitepaper-Data-communication-with-Victron-Energy-products_EN.pdf|Data communication whitepaper]].
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   - Open Actisense NMEA Reader
   - Select data view (tab selection is at the bottom left)
-  - Right click the PGN: \\ {{:ve.can:data_instance_0.png?direct&}}
+  - Right click on the PGN number. Note that this will only work on PGNs that allow changing their data instance: \\ {{:ve.can:data_instance_0.png?direct&}}
   - And change the value: \\ {{:ve.can:data_instance_1.png?direct&}}
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 ===== 4. Changing Instance Using Maretron N2KAnalyzer =====
-Maretron understands that it is sometimes difficult to know whether a particular product uses device instance or if it uses data instance to uniquely identify itself on an NMEA 2000 network. For this reason, Maretron uses a term called "Unique Instance" where the N2KAnalyzer software tool automatically determines if a particular device uses device or data instances.
+Maretron uses a term called "Unique Instance" where the N2KAnalyzer software tool automatically determines if a particular device uses device or data instances.
+WARNING: At Victron we do not understand what and how the Maretron software works with regards to this. We advise to use another tool, not Maretron, so that you know what you are doing, ie know what instance you are changing. So far, we have not been able to use Maretron software to change a data instance. And changing the other instance, the device instance can also be done straight from the Victron GX device its user interface. To change a data instance, for example to fix instance conflicts as reported by the Maretron software, we recommend to use Actisense. Not Maretron.
 Open N2KAnalyzer and make sure that the "Unique Instance" column is turned on (i.e. checked) using the Setup>Columns menu item.