So I'm using the setup described in this page: http://arduino.cc/en/Main/Standalone I am using an external 5v+ adapter.
I am a bit confused for what the vccio pin on the usb interface does. Is it an input or an output? I guess it is an input for the usb interface to know what voltage to use on the signals. In that case I should connect it to 5V+, as described in the guide. But if so, should I desolder the jumper on the usb interface board, as described in the following post? http://forum.sparkfun.com/viewtopic.php?f=15&t=21234
The guide at arduino.cc doesn't say I should...
(the guide at arduino.cc also sais: "In this situation we'll be using VCC (to supply 5V from the USB port to your board), GND, TXD, and RXD.". But that's not what's on the pictures, or in the rest of the text. Weird)