Re: [Apcupsd-users] apcupsd not showing any UPS load

[Trev <tr...@se...>]

Jeffery Small wrote on 27/11/25 10:56 am:
> Xubuntu:    24.04.3
> apcupsd:    3.14.143.1build2  (standard Ubuntu package)
> UPS:	    New APC SMC1500C with USB connection
> 
> I just built a new Linux workstation with a new APC UPS.  Everything is
> running fine except that the monitor is showing no load despite all of
> my equipment plugged into the UPS.  Here is a link to a screenshot:
> 
> http://cjsa.com/misc/apcupsd_01.png
> 
> Any reason that this is happening?  On my previous system with the same UPS
> which was more than five years old, all of this worked fine.  Could this
> be a configuration issue? 

It is unclear to me whether you are using the same UPS. You say it's a 
new APC UPS and later the same UPS. I'd hazard a  guess that it is a new 
UPS and very probably has a different firmware. APC's USB firmware 
versions have been notoriously buggy. Is there a firmware update for the 
new UPS? If so, apply it and hope.

Alternatively:

1) try the modbus protocol as someone has already helpfully suggested; or
2) try a USB->RS232 converter if you have a serial port on your new 
computer.