Hi Simple solution I can guess is 'open("/dev/ttyS0",O_RDONLY);'. Check Syntax. Unless you are seriously interested in handling everything on your own. HTH Bye Shridhar On Fri, 9 Jun 2000, Sharad Joshi wrote: > Hello folks, > > Can anyone please tell me how do i send chatacters over a serial line (say > ttyS0). I want to make use of the serial driver (serial.c) functions. But