Question about APC Back-UPS ES 725 Broadband (BE725BB-TU) UPS System

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Desk top APC UPS ES750 not communicating

I just installed an APC UPS ES750 battery for my computer. I keep getting a windows message (Unable to communicate with battery message) I use XP PRO and I have down loaded the latest version of the communication software from APC, I replaced the APC unit with another new one, I replace the USB cable, I have run numerous self tests that show that the computer and battery are communicating, I can get monitoring info from the battery when I click on that function of the APC software. Everything seems to be working fine but it is very annoying to have this message pop up every few minutes. This message pops up in a yellow box in the lower right hand corner of my screen. can you help?

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Re: desk top APC UPS ES750 not communicating

Here is an answer I got from APC when one of my client got the same problem as you did:

The error message would pop up if the link between the computer and the UPS is weak. I cannot rule out a problem with the cable or the UPS. In order to confirm the same please try the following steps which might help :

1) Ensure that the USB cable is properly connected to the USB port of the computer.

2) If the PC was powered on before the UPS, communication will not be achieved until you disconnect and reconnect the USB cable to the host. In this case, you need to disconnect and reconnect the USB cable to establish communication.

3) Some other software is polling your USB port for another device, thus causing the UPS software to temporarily lose communication with your UPS. If this is the case, you would need to shut down that application.

4) If you have any other USB devices connected to the PC, disconnect them and then try plugging in the cable.

If the issue persists, please visit the following link which lists few troubleshooting steps :

Posted on Jan 13, 2008

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