B&G Vulcan R, Installation Manual

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Diagnostics
Provides information useful for identifying an issue with the
network.
Ú
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.
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.
Fast Packet Errors
Cumulative counter of any fast packet error. This could be a missed
frame, or a frame out of sequence etc. NMEA 2000 PGNs are made
of up to 32 frames. The entire message will be discarded when a
frame is missed.
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Software Setup | Vulcan R Series Installation Manual