Simrad R2009 User Manual page 49

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Selecting a device in this list will bring up additional details and actions:
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 for 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.
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.
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
Simply 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.
Software setup | R2009/R3016 User manual