You could try my "ShowInfo" Sketch: Arduino Playground - ShowInfo there is a 'r' option to test the serial connection. It is a short loop, and during that loop you can type characters followed by enter, and see what it does.
You could try my "ShowInfo" Sketch: Arduino Playground - ShowInfo there is a 'r' option to test the serial connection. It is a short loop, and during that loop you can type characters followed by enter, and see what it does.