problem in c code

hi this is vipul

i am having a problem in my c code.
the proble is as we are transmitting data from rs232 via laser and reciever doesn't show what we send.
for eg we send small 'g' and recieving pane shows 'D'.
following is the code can anyone help me?????????
#include <dos.h>
#include <stdlib.h>
#include <conio.h>
#include <bios.h>
#include <stdio.h>

#define COM1 0
#define COM2 1
#define DATA_READY 0x100
#define TRUE 1
#define FALSE 0
#define ESC_KEY '\x1b'

#define SETTINGS ( _COM_9600 | _COM_CHR8 | _COM_NOPARITY | _COM_STOP1)

void clear_line(int line)
{
int i;

gotoxy(1,line); // clear a whole line
for(i=0;i<80;i++)
printf(" ");
}
int main(int argc, char *argv[])
{
int in, out, status, done = FALSE;
int curs_rx=0,curs_ry=15,curs_tx=0,curs_ty=4;
int com_port=COM1;

if (!(argc == 2 && (argv[1][0] == '2' || argv[1][0] == '1')))
{
printf("Usage: LASER [1|2]\nwhere 1 = Com port 1\n 2 = Com port 2\n");
exit(-1);
}
if (argv[1][0]=='2') // select com port
com_port = COM2;
else
com_port = COM1;

bioscom(_COM_INIT, SETTINGS, com_port); // Initialize serial port

clrscr();
printf(" GKDesign (c) 1997 Laser Transceiver Communicator V1.1\n");
printf(" Press [ESC] to exit program\n");
printf("__________________________________ Sent Data ___________________________________");
gotoxy(1,13);
printf("________________________________ Recieved Data _________________________________");

while (!done) {
status = bioscom(_COM_STATUS, 0, com_port); // recieved data?
if (status & DATA_READY)
if ((out = bioscom(_COM_RECEIVE, 0, com_port) & 0x7F) != 0) { // get data
if (curs_rx < 78) // move cursor
curs_rx++;
else {
curs_rx = 1; // at end of line
if (curs_ry < 23)
curs_ry++;
else
curs_ry = 15;

clear_line(curs_ry);
}
gotoxy(curs_rx,curs_ry); // goto correct screen location
putch(out); // print the character
}
if (kbhit()) {
if ((in = getch()) == ESC_KEY) // check for ESC key
done = TRUE;

if(!in) // read an extended character
in = getch();

if (curs_tx < 78) // position cursor
curs_tx++;
else {
curs_tx = 1; // at end of line
if (curs_ty < 12)
curs_ty++;
else
curs_ty = 4;

clear_line(curs_ty);
}
gotoxy(curs_tx,curs_ty); // goto correct screen location
putch(in); // print the character
bioscom(_COM_SEND, in, com_port); // output data
}
}
clrscr();
return (0);
}