Df1 programming example (cont’d) – Rockwell Automation 5370 CVIM Communications Manual User Manual
Page 124

Chapter 5
Using the RS–232 Ports
5–54
/* CVIM RS–232 Communication example program using DF1 protocol */
/* Copyright Allen–Bradley 12-5-89 jrm, aes */
This sample program was compiled using Microsoft C Version 5.1 */
#include
#include
#include
#define STX 0x02 /* Start of Text character */
#define ETX 0x03 /* End of Text character */
#define ENQ 0x05 /* Enquire */
#define DLE 0x10 /* Data Link Escape (Control char) */
#define ACK 0x06 /* Positive acknowledgement */
#define NAK 0x15 /* Negative acknowledgement */
#define COMMFLAGS 0x8E00 /* defines bits to check for comm error */
#define MAX BUFFER
128
/* define storage for configuration data */
unsigned char config [135] [MAX BUFFER] configlen [135]
template [256] [MAX BUFFER] templen [256[
unsigned char last_response = 0;
void main()
{
int x, op_num, portnum, err, replen, reslen, numblocks;
unsigned char reply[200], results[MAX BUFFER];
/* Get Serial port number from user */
printf (”Enter port number (1 for COM1 or 2 for COM2):”);
scanf (”%d”, &portnum));
/* make portnum either 0 or 1 */
portnum = (portnum – 1) & 0x01;
/* Open comm channel to at 9600 baud */
_bios_serialcom (_COM_INIT, portnum–1, _COM_CHR8 | _COM_STOP1 |
_COM_NOPARITY | _COM_9600);
DF1 Programming Example
(cont’d)