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 2.6.29.1-smp #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. David
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