Powered USB hub that doesn't power from the PC if its available first ? Answered
Odd problem. I'm trying to find a USB hub that does NOT ennumerate when the external power isn't connected to the hub. All I've tried so far do their best to supply the connected items with what's available. I have devices attached that need more than 100mA, can't get it, and freak out.
I've tried a standard hub, and cut the USB +5 from the PC, which stops the things ennumerating sure, but they don't ennumerate when you plug the power in !
I suppose I COULD put a signal relay in, or logic that would do it, but something off the shelf would be better.