If a Cyberpower CP685AVR UPS has a dead battery then USB communication is not possible since a relay is not thrown to power the USB-HID circuit. Is this behaviour the default for a typical UPS?
I have a ESP32-S3 working via WiFi with several models by parsing known good NUT configs, but if this is the default for a lot of UPS’s I will stop writing the parser and stick to a simple ping approach as the parser is becoming complicated to write.
Most people keep batteries in things like battery backup units.
To ask more clearly, if a UPS has a completely dead battery, is it typical that the USB connection dies completely?
That’s actually an interesting question. I think most people would get mad at the battery alarm and shut it off. But if you leave it running, and it has wall power, it’s a failure as a ups but it should still communicate.
If I designed the thing, it would talk even with a dead battery. I think the pro stuff like Apc’s with network cards don’t just ignore the world at that point. We’re talking about the main comms port I’m assuming. There are other usb ports for power, I’m ignoring them.
