When a device is connected to more than one source providing the same data, the user can
choose the preferred source. Before commencing with source selection make sure all
external devices and the NMEA 2000 backbone are connected and are turned on.
Auto select data sources
The Auto select option looks for all sources connected to the unit. If more than one source is
available for each data type, selection is made from an internal priority list. This option is
suitable for the majority of installations.
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Note: Auto data source selection may already have been selected at first time startup.
However, it should be redone if any new devices have been added to the network since.
Advanced data source selection
The advanced option allows for you to manually select or unselect data sources. Manual
selection is generally only required where there is more than one source for the same data,
and the ‘Auto select’ selected source is not the one desired.
Device list
The Device list shows all NMEA 2000 devices.
Selecting a device in this list will bring up additional details and options for the device.
All devices allow allocation of an instance number in the Configure option. Set unique
instance numbers on any identical devices on the network to allow the unit to distinguish
between them. The Data option shows all data being output by the device. Some devices
will show additional options specific to the device.
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Note: Setting the instance number on a 3rd party product is typically not possible.
Diagnostics
The NMEA 2000 tab on the diagnostics page can provide information useful for identifying
an issue with the network.
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Note: The following information may not always indicate an issue that can be simply
resolved with minor adjustment to network layout or connected devices and their
activity on the network. However, Rx and Tx errors are most likely indicating issues with
the physical network, which may be resolved by correcting termination, reducing
backbone or drop lengths, or reducing the number of network nodes (devices).
Bus state
Indicates whether the bus is powered, but not necessarily connected to any data sources.
However, if bus shows as off, but power is present along with an increasing error count, it is
possible that termination or cable topology is incorrect.
Rx Overflows
The unit received too many messages for its buffer before the application could read them.
Rx Overruns
The unit contained too many messages for its buffer before the driver could read them.
Rx/Tx Errors
These two numbers increase when there are error messages, and decrease when messages
are received successfully. These (unlike the other values) are not a cumulative count. Under
normal operation these should be at 0. Values around 96 upwards indicate a heavily error
prone network. If these numbers go too high for a given device, it will automatically drop off
the bus.
Rx/Tx Messages
Shows actual traffic in and out of device.
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Software setup | S3009 Echo Sounder User Manual
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