Hi Lubomir,
On Thu, Mar 18, 2010 at 01:00:44AM +0100, Lubomir Schmidt wrote:
How can i change the cable to get it working? What is a level-converter and where can i get such?
You need something like a MAX3232 to convert between 9V and 3.3V levels for both directions. You can find many example schematics on the net.
Since you don't seem to know anything about it, I recommend simply buying a different cable.