Well, if you have 2 physical serial ports on your host, it's easy:

- Connect the two ports using a null-modem cable (as you probably already did)
- Configure the VM to use one of the host's physical serial ports (e.g., COM1)
  No matter which one you use, it should show up as /dev/ser1 under QNX.
- Run a terminal emulation (e.g., hyperterminal) on the host, and connect to 
  the _other_ COM port (e.g., COM2). 

With that setup, you should be able to both read and write from/to the serial 
port in QNX.

Regards,
Thomas


-----Original Message-----
From: shakthi b [mailto:community-noreply@qnx.com] 
Sent: Donnerstag, 8. September 2011 14:26
To: general-bazaar
Subject: Re: RE: got error while reading from COM 1

hi thomas,

thanks for your reply.. but what to do now?? i dint understand what u r referring? but now am connecting com1 and com2 
using female pin connector.. now i can write it in com1 using qnx and read it from com2 using qnx.. but now also am 
facing same problem..... do u ve any other suggestion?? or is it possible to use hyperterminal like write it to com2 
using hyperterminal , so that i can read it from com2. please say ur suggestion. am ameatur in serial port in qnx...

thanks in advance,
shakthi



_______________________________________________

General
http://community.qnx.com/sf/go/post88713

hi thomas,

thank you so much for your help.. successfully got output in hyperterminal when i write something in com1 using qnx code
.. but now problem is it can able to read only two characters. dont why this happened?? can you clarify my doubt.. 

my code is :
// qnx code
/*#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#include<errno.h>
#include<termios.h>
#include<string.h>
#include<stdlib.h>
#include<pthread.h>
#include<time.h>
#include<signal.h>
#include<sys/time.h>
//pthread_t serial_thread1;
//int serial_temp=0,serial_temp1=0;
int WriteAdrPort(char*);
//int readadrport1(char*,int);
int readadrport(char*,int);
void CloseAdrPort();
int serial_fd=0;
struct termios serial_termios;
int main(int argc,char *argv[])
{
char serial_writemsg[100];
char serial_readmsg[100];
char serial_portname[100];
int serial_portnumber;
int serial_write;
memset((void*)&serial_writemsg,'\0',sizeof(serial_writemsg));

printf("\n enter the serial port number");
scanf("%d",&serial_portnumber);
printf("OpenAdrPort port = %d \n", serial_portnumber);
sprintf(serial_portname, "/dev/ser%d", serial_portnumber);
printf("sPortName = %s\n", serial_portname);
serial_fd = open(serial_portname, O_RDWR | O_NOCTTY | O_NDELAY);
if (serial_fd < 0)
{
printf("open error %d %s\n", errno, strerror(errno));
exit(0);
}
else
{
printf("fd is %d\n",serial_fd);
tcgetattr(serial_fd, &serial_termios);
tcflush(serial_fd, TCIFLUSH);
//serial_termios.c_cflag = B9600 | CS8 |CREAD | CLOCAL | HUPCL;
cfsetispeed(&serial_termios,B9600);
cfsetospeed(&serial_termios, B9600);
tcsetattr(serial_fd, TCSANOW, &serial_termios);
}
printf("\n enter the serial port command");
scanf("%s",serial_writemsg);
serial_write=WriteAdrPort(serial_writemsg);
if(serial_write>0)
	printf("\n successfully written");
else
	printf("\n error in writing");

CloseAdrPort();
}
int WriteAdrPort(char *serial_writeoutmsg)
{
int serial_out;
if (serial_fd < 1)
{
printf(" port is not open\n");
exit(0);
}
serial_out = write(serial_fd,serial_writeoutmsg, strlen(serial_writeoutmsg));
if (serial_out < 0)
{
printf("write error %d %s\n", errno, strerror(errno));
}
else
{
printf("wrote %d chars: %s\n",serial_out,serial_writeoutmsg);
}
}
void CloseAdrPort()
{
if (serial_fd > 0)
{
close(serial_fd);
}
}
*/


thanks in advance,
shakthi