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Appendix A Register Structure and Format

Programming example

The following C example shows how to program the PCL-743/745

registers directly. It uses I/O ports hex 3F8 and 2F8 to test the PCL-

743/745 send, receive and FIFO functions.

***************************************************/

/* Program: DEM001.C

/* Description:

/* Sends a string from COM1 to COM2 then reads

/* it back from COM2 and displays it on the

/* screen. It uses direct register control.

***************************************************/

# include <dos.h>

# include <io.h>

# include <stdio.h>

# include <conic.h>

/* Timeout value in seconds */

#define TIME_OUT 10000

static int base0=0x3f8; /* Port 1 base address

(COM1)*/

static int base1=0x2f8;/*Port 2 base address

(COM2)*/

static char rec[16]; /* Receive buffer */

static char CMD[16]; /* Command buffer */

Void main()

{

int i;

timeout; /* counter for timeout */

char flag;

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Advantech PCI-1602 Especificaciones Pagina 84