Communication Error
Advice UPS (Uninterruptible Power Supply)
Severity: MinorWhat Does This Error Mean?
A Communication Error means the UPS monitoring software on your computer can no longer talk to the UPS over the USB or serial cable. The UPS itself continues to function and protect your equipment — only the software link is broken. Reseating the USB cable and restarting the UPS monitoring service resolves most communication errors.
Affected Models
- Advice UPS models with USB monitoring port
- Advice UPS models with RS-232 serial port
Common Causes
- USB cable disconnected or damaged
- USB port suspended by Windows power management
- UPS monitoring software service stopped or crashed
- USB driver conflict after a Windows update
- UPS firmware restart resetting the communication link
How to Fix It
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Unplug the USB cable from both the UPS and the computer, wait 10 seconds, and firmly reconnect. Try a different USB port on the computer.
USB cables that look fine can have internal wire breaks. If reseating does not help, try a known-good USB cable of the same type.
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Restart the UPS monitoring software or service on your computer. If using Windows, open Services, find the UPS monitoring service, and restart it.
The service name varies by software — common names include PowerPanel Personal Edition Service or the Advice-branded equivalent.
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Disable USB selective suspend for the UPS port in Windows Device Manager to prevent Windows from powering down the port.
Go to Device Manager > Universal Serial Bus Controllers, right-click the UPS entry, choose Properties > Power Management, and uncheck the option to allow Windows to turn off the device.
Frequently Asked Questions
Does communication error affect UPS protection?
No — the UPS hardware continues to protect connected equipment regardless of whether the USB communication link is working. The only impact is that automatic shutdown software will not function until the connection is restored.