Richard Sharpe wrote: > I once wanted to be able to programmatically (from the outside) switch > off USB for a USB connected device. Ie, simulate the pulling of the > USB cable, and make sure that the firmware reacted correctly. Could > this perform that function?
Yes. You'd have to cut open a USB cable or make an adapter board to insert the switch into the VBUS line, and then you could simulate USB plug/unplug. Oh, about the connectors: the relay and opto-coupler channels (front panel) will use standard 4 mm banana plugs. The rear panel will have 100 mil headers. All input and outputs are galvanically isolated from each other and from USB. (Exception: CH1/CH2 (front) relay and opto share common/cathode.) In case your device ignores the unplug, it would still be able to communicate via D+/D-, but that's a different story :-) If the device draws signifiant current from USB (more than 30 mA), you'd have to use one of the relays, which would have a rated life expectancy of about 30 kcycles at 500 mA DC. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
