Re: [Libusb-win32-devel] Please help installing libusb-32.

[Xiaofan C. <xia...@gm...>]

On Wed, Sep 12, 2018 at 2:21 PM Dmitry Donskoy <ad...@da...> wrote:
>
> During my investigation of "Data stale" error of NUT, I open Device
> Manager and I see that "libusb-win32" device is disappearing and
> appearing again every 30 seconds approximately. It looks just like
> someone unplugs the UPS USB cable and plugs in again (but there is no
> indication of any actual disruption in physical connectivity).
>
> I do really need to use NUT with this UPS (PCM RPT-800A).
>
> How do I make this "libusb-win32" driver to be installed correctly so it
> won't disappear and appear in Device Manager by itself?


In this case, this has nothing to do with libusb-win32, Windows
handles the enumeration of the device and apparently the
device has some HW/FW issues that it got kicked out by
Windows.

You can try to have a better USB cable or change to a different
PC to see if that helps.

Ref: https://blogs.msdn.microsoft.com/usbcoreblog/2009/10/30/how-does-usb-stack-enumerate-a-device/

And new version of Windows are more strict than old version of Windows, if you
have problems with Windows 10, try Windows 7.

-- 
Xiaofan