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

[Pavel B. <boc...@po...>]

In second case, switch to serial cable from the UPS of course. Things appear
to be working OK over good ol' serial as has been confirmed dozens of times 
already.

-- 
S uctivým pozdravem/best regards,

Pavel Boček
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Datum: 27. 11. 2025 6:16:26
Předmět: Re: [Apcupsd-users] apcupsd not showing any UPS load
"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. 


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