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22 |
All devices allow allocation of an instance number via the
Configure option. Set unique instance numbers on any identical
devices on the network to allow for HDS to distinguish between
them. Some devices will have additional options on the configure
page, such as selecting a device location, or reseting calibration
applied. The Data option shows all data being output by the device.
Some devices will show additional option(s) specific to the device
- the RC42 illustrated above has a Calibrate option, to allow easy
setup of this device.
¼ 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.
Bus state: This 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 CAN driver got too many messages for its buffer
before the application could read them.
Rx Overruns: The CAN hardware got too many messages for its
buffer before the CAN 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.
Bus Load: A high value here indicates network is near full capacity.
Some devices automatically adjust rate of transmition, if network
traffic is heavy.
Fast Packet Errors: Cumulative counter of any fast packet error.
This could be missed frame, or 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.
¼ Note:
The above 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
Software setup |
HDS Gen3 Polaris Installation Manual
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