On Mon, Aug 16, 2004 at 05:46:36PM -0400, Robinson, Josh D wrote: > I am setting up a program that uses posix serial > communication. I have ported this project from MAC OS X and > everything seems to be fine except incoming data. It seems the > "/dev/ttyS0" does not behave like it should ( I can't read any data > from it). The problem is that any calls to "/dev/ttyd0" don't > work. Is there something I have to do to get "/dev/ttyd0" to work?? Also make sure there is no other process (like getty, ppp, serial modem, fax) on it. Look with lsof or fuser.... Since a common use of the serial port is a modem the permissions and owner may be wrong. Double check. As Kevin noted also check the tty modes, baud rate, cooked, raw, etc. -- T o m M i t c h e l l Just say no to 74LS73 in 2004