On Mon, Sep 12, 2011 at 9:28 PM, David <djmunn at bigpond.com> wrote: > the adaptor is on /dev/ttyUSB0 but cant find out what ttyS port it is using You answered your own question - it's using ttyUSB0, not ttyS0. ttySn is for hardware serial ports. ttyUSBSn is for USB/rs232 adapter serial ports. -- -Jason kg4wsv