[Nut-upsuser] USB/UPS connectivity issue on Intel DP55KG Motherboard

Charles Lepple clepple at gmail.com
Thu Oct 15 13:22:35 UTC 2009

On Oct 13, 2009, at 5:55 PM, Justin Piszcz wrote:

> Hello,
> I use the following in my ups.conf:
> # USB:
> [apc]
>  driver = usbhid-ups
>  port = auto
>  desc = "APC 1500VA"
>  pollfreq = 5

On NUT 2.4.1 (and some older versions), the pollfreq value determines  
how often usbhid-ups explicitly requests all of the values; however,  
the UPS is still free to send interrupt reports at any time within  
that polling interval, and those reports should be processed more  

Typically, interrupt reports are sent by the UPS when status  
conditions change, so the reporting delay for something like a power  
failure should be well below pollfreq.

Was there a particular issue that led you to choose "5" for pollfreq?  
If so, what version of NUT were you using at the time?

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