After replacing a UPS device, Windows may automatically delete the APCUPSD USB driver. When the computer boots up, the tray icon status will say “Network Error” and three errors will be logged in the Windows Event Viewer.
To restore APCUPSD to online status, simply re-install the USB driver by following the manual installation instructions. That information can be found in the program directory. For example, C:\Program Files\apcupsd\driver\install.txt In a nutshell, you need to look in the system’s Device Manager. If there is an item in the Human Interface Devices group named “American Power Conversion USB UPS” then the desired driver is missing. Right click that item, click “Update driver” and then pick the correct driver.
After restoring the driver, restart the APCUPSD service by using the “Start Apcupsd” shortcut in the Start menu, or by using the Services administrative tool.
What’s big and slow and rarely ever useful? For one thing, the software that comes with every desktop-grade Uninterruptible Power Supply (UPS) made by APC. This isn’t news. I know APC would like nothing more than to have me buy a more expensive piece of hardware that I don’t need, just to get the useful software that I do need.
Enter APCUPSD with USB support for Windows. It’s free. It’s open source. It’s probably not supported by APC, but if you’ve ever tried to get tech support for a desktop-grade APC unit that was connected to a server, you already know APC isn’t going to help you with computer problems. This free piece of software makes my UPS more useful than just a battery with a power switch. Now I can have my server send a text message to my mobile phone whenever a blackout strikes my area. I can see live power management statistics from any web browser in the world, including the one on my phone. I have fewer things to monitor with regard to uptime, and I love it.