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How do I send data from a serial port

How do I send data from a serial port

How do I send data from a serial port

I can recieve data ok but I can't export it out.
This is the source I am using.
#include <stdio.h>
#include <bios.h>

unsigned comminset;
unsigned commoutset;
unsigned datain;
unsigned dataout;

int portin;
int portout;
unsigned int comstatus;
int count;
unsigned char out;
unsigned char in;

void main(void)
printf("%s\n","Enter Input Port");
printf("%s\n","Enter Output Port");

/* initialise input serial port settings 9600,E,1,7*/
comminset = _COM_CHR7+_COM_STOP1+_COM_EVENPARITY+_COM_9600;
comstatus = _bios_serialcom(_COM_INIT,portin-1,comminset);
printf("%s %i %s\n","Comm Port",portin,"Initialised For Input");

/* initialise output serial port settings 9600,E,1,7*/
commoutset = _COM_CHR7+_COM_STOP1+_COM_EVENPARITY+_COM_9600;
comstatus = _bios_serialcom(_COM_INIT,portout-1,commoutset);
printf("%s %i %s\n","Comm Port",portout,"Initialised For Output");
for (; ;)
/*read character from input port*/
comstatus = _bios_serialcom(_COM_RECEIVE,portin-1,comminset);
printf("%hu ",comstatus);
if (in<127)
if (in=='\45')
if (count >= 180)
out='\04';/*send EOT character to output port*/
printf("%c %c %3d\r",in,out,count);

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