Thread: Serial port Communication

Dear Experts,

i trying to read the data from serial port COM1,
though my program is correct i am not understanding how to provide the inputs and how to check its output,

Code:

#include <dos.h>
#include <stdio.h>
#include <conio.h>

#define PORT1 0x3F8  /* Defines Serial Port Base Address (COM1 */

void main(void){
    unsigned char c = 0;
    unsigned char chrctr = 0;
    /*int exit = 1; */

    outportb(PORT1 + 1, 0); /* Turn off interrupts */

    /* PORT1 Communication Settings */

    outportb(PORT1 + 3, 0x80); /* Set DLAB ON */
    outportb(PORT1 + 0, 0x0C); /* Set the baud rate to 9600 */

    outportb(PORT1 + 1, 0x00); /* Set Baud - Divisor latch HIGH */
    outportb(PORT1 + 3, 0x03); /* 8 bits, no parity, 1 stop */
    outportb(PORT1 + 2, 0xC7); /* FIFO Control Register */
    outportb(PORT1 + 4, 0x0B); /* Turn on DTR, RTS, and OUT2) */

    printf("Waiting on transmission from source.\nPress ESC to quit.\n");

    while(chrctr != 27){      /* Execute the loop if ESC has been hit */
    c = inportb(PORT1 + 5);
    if (c & 0x01){
        chrctr = inportb(PORT1);
        printf("%d",chrctr);
        }
    if (kbhit()){
        chrctr = getch();
        outportb(PORT1, chrctr);
        }
    }
    }"

when i execute this program at dos prompt it says

Code:

Waiting on transmission from source.\nPress ESC to quit.

and when i press escape it will come out as the loop suggest

but i want communicate through that port please tell me how to check the outputs for this program as i am not much aeware of it please experts tell me how read the data from the serial COM1.

Dear experts,

thank you for your reply,
yes i am widows xp and installed the turbo c here and trying to run that program , is it is right way,
please help me i want to communicate to serial port
COM1, what i have to do , or what modifications has to be done, in device manager which properties need to be checked,
whether it is General, Driver,Port Settings,Details or Resources.

please help me,

with regards,
vidya.

Dear experts,

thank you for u r reply,
ya that COM1
i/o range it shows:03F8-03FF

what i am doing is i am working on windows Xp and installed the turbo c here,
and went through run->cmd (command line)

c:\tc>tc

i got the editor where i typed this program and compiled it compiled fine,
and when executed it simply shows nothing ,
so how to communicate properly please advice me,
how to modify this so that we can communicate please advice me.

first use hyper terminal to check your com port is actually doing anything

http://technet.microsoft.com/en-us/l.../cc728155.aspx

Thank you for u r reply,

i will definitely check the hyper terminal with COM1 port,
but my actual question is how to connect the printer to the COM1 port,
still i have not connected it,what is the procedure,

as i have set of procedure how to connect hyper terminal , how to configure it through COM1 is there any way to connect the printer,


please tell me.

This might help you,

http://www.codeproject.com/KB/printi...spx?print=true

http://www.google.com/search?hl=en&q...=Google+Search