NMEA 2000
Provides 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
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.
Ú
Note:
Rx and Tx Errors often indicate an issue with the physical network, which may be
resolved by correcting termination, reducing backbone or drop lengths, or reducing the
number of network nodes (devices).
UDB
The UDB (User Data Base) tab on the diagnostics page, provides information on Ethernet
activity.
J1939
The J1939 tab on the diagnostics page, provides information on J1939-bus activity.
Software setup
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