On Wed, 24 Dec 2025 12:02:15 +0100 Jim Klimov <[email protected]> wrote: > > I'm having problems with one of my UPS (BEST MD500), the upsd has > > stale data, we get a power hit and upsmon give the following > > message: > > > > upsmon[918]: UPS [UPS1@localhost] was last known to be not fully > > online and currently is not communicating, assuming dead > > > > upsmon starts a shutdown and then upsd gives a data is no longer > > stale, but the shutdown still happens. Or a way to have upsmon > > wait awhile before starting the shutdown? > > > > Is there someway to stop the shutdown when this happens? I'm still > > debugging why the driver is loosing communication with the UPS. > > -- > > Michael > > _______________________________________________ > > Nut-upsuser mailing list > > [email protected] > > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser > > > Cheers, and happy holidays. > > I am not sure your logs here show the whole picture. For upsmon to > behave this way, thee must have been a power event and the driver > told the data server the UPS is on battery. Pollfreq increases too > (time delay decreases). If the UPS connection gets lost then, this is > deemed immediately critical as we don't know how long the system can > be up. Maybe battery is old and does not fit its spec or latest > calibration. So we issue FSD to save as much as we can ASAP. > > Need to check in code if there are now any throttle toggles for > this. > > And then if shutdown did begin, generally the only way to bring the > system back up consistently is to reboot it one way or another. Your > custom SHUTDOWNCMD implementation may do whatever fits your case > though. > > Hope this helps, > Jim Klimov > > > On Tue, Dec 23, 2025, 21:54 Michael Hughes via Nut-upsuser < > [email protected]> wrote: >
Jim, Yes, there was a power outage message before the lost communication. I had thought about changing the poll interval since the communication is done through RS-232. -- Michael
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