Communication Program Of Pc - Delta VFD-B User Manual

Chapter 5 Parameters|VFD-B Series
Exception
code
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3.7 Communication program of PC:

The following is a simple example of how to write a communication program for Modbus ASCII
mode on a PC by C language.
#include<stdio.h>
#include<dos.h>
#include<conio.h>
#include<process.h>
#define PORT 0x03F8 /* the address of COM1 */
/* the address offset value relative to COM1 */
#define THR 0x0000
#define RDR 0x0000
#define BRDL 0x0000
#define IER 0x0001
#define BRDH 0x0001
#define LCR 0x0003
#define MCR 0x0004
#define LSR 0x0005
#define MSR 0x0006
unsigned char rdat[60];
/* read 2 data from address 2102H of AC drive with address 1 */
unsigned char tdat[60]={':','0','1','0','3','2','1','0','2', '0','0','0','2','D','7','\r','\n'};
void main(){
int i;
outportb(PORT+MCR,0x08);
outportb(PORT+IER,0x01);
outportb(PORT+LCR,(inportb(PORT+LCR) | 0x80));
/* the BRDL/BRDH can be access as LCR.b7==1 */
outportb(PORT+BRDL,12);
outportb(PORT+BRDH,0x00);
outportb(PORT+LCR,0x06);
<8,N,2>=07H, <8,E,1>=1BH, <8,O,1>=0BH */
for(i=0;i<=16;i++){
5-94
Explanation
Communication time-out:
If Pr.09-03 is not equal to 0.0, Pr.09-02=00~02, and there is no
communication on the bus during the Time Out detection period (set
by Pr.09-03), "cE10" will be shown on the keypad.
/* interrupt enable */
/* interrupt as data in */
/* set baudrate=9600, 12=115200/9600*/
/* set protocol, <7,N,2>=06H, <7,E,1>=1AH, <7,O,1>=0AH,
Revision July 2008, BE16, SW V4.08 & V5.00