Code produces incorrect outcome - c

Question

The following code compiles in (Geany) and Runs.
--->
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
int set_interface_attribs(int fd, int speed)
{
struct termios tty;
if (tcgetattr(fd, &tty) < 0) {
printf("Error from tcgetattr: %s\n", strerror(errno));
return -1;
}
cfsetospeed(&tty, (speed_t)speed);
cfsetispeed(&tty, (speed_t)speed);
tty.c_cflag |= (CLOCAL | CREAD); /* ignore modem controls */
tty.c_cflag &= ~CSIZE;
tty.c_cflag |= CS8; /* 8-bit characters */
tty.c_cflag &= ~PARENB; /* no parity bit */
tty.c_cflag &= ~CSTOPB; /* only need 1 stop bit */
tty.c_cflag &= ~CRTSCTS; /* no hardware flowcontrol */
/* setup for non-canonical mode */
// tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
// tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
tty.c_oflag &= ~OPOST;
/* fetch bytes as they become available */
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 1;
tty.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /* sets Raw mode */
if (tcsetattr(fd, TCSANOW, &tty) != 0) {
printf("Error from tcsetattr: %s\n", strerror(errno));
return -1;
}
return 0;
}
void set_mincount(int fd, int mcount)
{
struct termios tty;
if (tcgetattr(fd, &tty) < 0) {
printf("Error tcgetattr: %s\n", strerror(errno));
return;
}
tty.c_cc[VMIN] = mcount ? 1 : 0;
tty.c_cc[VTIME] = 5; /* half second timer */
if (tcsetattr(fd, TCSANOW, &tty) < 0)
printf("Error tcsetattr: %s\n", strerror(errno));
}
int main()
{
char *portname = "/dev/ttyS0";
int fd;
int i;
int wlen;
fd = open(portname, O_RDWR | O_NOCTTY | O_SYNC);
if (fd < 0) {
printf("Error opening %s: %s\n", portname, strerror(errno));
return -1;
}
/*baudrate 2400, 8 bits, no parity, 1 stop bit */
set_interface_attribs(fd, B2400);
//set_mincount(fd, 0); /* set to pure timed read */
unsigned char str[] = {0x56, 0x45, 0x52, 0x0D};
write(fd,str,strlen(str));
/* simple output */
/*
wlen = write(fd, "*\n", 2);
if (wlen != 2) {
printf("Error from write: %d, %d\n", wlen, errno);
}
wlen = write(fd, "1\n", 2);
if (wlen != 2) {
printf("Error from write: %d, %d\n", wlen, errno);
}
wlen = write(fd, "8\n", 2);
if (wlen != 2) {
printf("Error from write: %d, %d\n", wlen, errno);
}
*/
tcdrain(fd); /* delay for output */
/* simple noncanonical input */
do {
unsigned char buf[80];
int rdlen;
rdlen = read(fd, buf, sizeof(buf) - 1);
if (rdlen > 0) {
#ifdef DISPLAY_STRING
buf[rdlen] = 0;
printf("Read %d: \"%s\"\n", rdlen, buf);
#else /* display hex */
unsigned char *p;
printf("Read %d:", rdlen);
for (p = buf; rdlen-- > 0; p++)
printf(" 0x%x", *p);
printf("\n");
#endif
} else if (rdlen < 0) {
printf("Error from read: %d: %s\n", rdlen, strerror(errno));
}
/* repeat read to get full message */
} while (i++ < 10);
}
<---
I need the following output at the 'Serial Port' to invoke a certain outcome:
From the keyboard "* 1 8 cr" works perfectly under Windows (Turbo Basic) but not under my Code running under Linux (compiled by GCC):
-->
For " * 1 8 cr " (star one eight enter(cr)) the four "binary" "chars" required are:
*= binary 00101010
1= binary 00110001
8= binary 00111000
cr= binary 00001101
<--
Unfortunately my code is not creating the correct output (Serial settings are believed to be set to (2400 N,8,1 with start and end bit) using 'termios' structure.
I have attached a old OscilloScope and there are bits being sent but I do not know how to capture them to check their correctness.
What is wrong with the Code?