Hi Andreas, Thanks a lot for your reply. I fixed the problem. It was in the serial port configuration in the AEB board. Andrea. -- Ing. Andrea Acquaviva D.E.I.S. - Universita' di Bologna V.le Risorgimento, 2 40136 BOLOGNA (ITALY) Tel: (+39) 051 20 93787 Fax: (+39) 051 2093786