[Nut-upsuser] Serial comm errors with bcmxcp on HP R3000 XR

David S. Madole david at madole.net
Fri Aug 28 17:38:46 UTC 2009

Kjell Claesson wrote:
> OK David,
>> Kjell,
>> Thanks for your time in replying.
>> The cable is a regular commercial shielded cable and is only six feet
>> long. Grounding should not be an issue, everything is on a single
>> circuit with a single ground and is powered through the UPS itself, all
>> in one cabinet, so all grounds should be at the same potential.
> That is good. Should not be any problems.
> Then the problem may be the polling frequency. The ups is sending
> a lot of data for each request.  But as you are running it at 19200 it should 
> be OK.
> I have my PW5125 on 9600 bps and have no problem. 
> What is your system spec ? Linux freebsd ?
> Kernel version ?
> I think there was some glitch around version 2.6.25 of the kernel
> that make the serial port behave strange.
# uname -rvmpio #1 SMP Fri Apr 10 14:22:00 EDT 2009 i686 Intel(R)
Pentium(R) 4 CPU 3.00GHz GenuineIntel GNU/Linux

The system is Slackware 12.1 with an updated kernel I compiled from source.

Should I try changing the polling frequency just to see if it helps?

> Can you relate the errors in the log to any activity? Is the time random
> or is it spread evenly over time ?
I am not getting any other errors or events or significance or that
correspond with the UPS errors. The comm errors are not continuous, but
there doesn't seem to be a strict pattern. They seem to cluster one
every minute or two for between two and ten minutes at a time, with
periods of between a half hour to an hour of quiet between the clusters.


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