>> "RB" == Remo Badii <Remo.Badii@psi.ch> writes: Hi, >> Error: Unable to Open Modem ``/dev/ttyI0'': Permission denied. RB> Modem ``/dev/ttyI0'' is Unavailable. RB> This is the output of ls -l /dev/ttyI0: RB> crw-rw---- 1 root dialout 43, 0 Sep 10 15:21 /dev/ttyI0 RB> Do I have to change the permission (how)? Just add your user to the dialout group. adduser username dialout Ciao, Martin