Winmate W07FA3S-PCO1-POE, Quick Start Up Manual

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c. Read/ Write Command
// ***************************************************************************
// Parameter:
// write_data static char write_data[] = "Hello World!!";
//
// ***************************************************************************
static void cmd_write (void)
{
write(COMPort_fd, &write_data[ 0 ], sizeof ( write_data )); // send character greeting
usleep (( sizeof (write_data) + 25 ) * 100 );
char buf[ 200 ];
int n = read(COMPort_fd, buf, sizeof ( buf ) ); // read up to 100 characters if ready to
read
printf ( "Read Data = %s\n" , buf);
}