Control.com - Nerds in Control

Hello

If you are still looking for a sample code, look below.

#include <windows.h>
#include <stdio.h>
#include "globs.h"

void InitCommPort(void)
{
 DCB dcb;
 char *pcCommPort = "COM1";
    COMMCONFIG CC;
    DWORD dwSize;
    COMMTIMEOUTS timeout;
 extern HANDLE hCom;
 extern int eflag;

    hCom = CreateFile( pcCommPort,GENERIC_READ | GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);

    if(!GetCommState(hCom,&dcb))
 {
  printf("\nGetCommState failed with error %d\n",GetLastError());
  eflag = -2;
 }
 else
 {
  dcb.BaudRate = CBR_9600;     // set the baud rate
  dcb.ByteSize = 8;
  dcb.Parity = NOPARITY;        // no parity bit
  dcb.StopBits = ONESTOPBIT;    // one stop bit
 }

 GetCommConfig(hCom,&CC,&dwSize);
 CC.dcb = dcb;

 SetCommConfig(hCom,&CC,dwSize);
 GetCommTimeouts(hCom,&timeout);

 timeout.ReadIntervalTimeout = 0;
 timeout.ReadTotalTimeoutConstant = 500;

 timeout.ReadTotalTimeoutMultiplier = 0;
 timeout.WriteTotalTimeoutConstant = 0;
 timeout.WriteTotalTimeoutMultiplier = 10;

 if(!SetCommTimeouts(hCom,&timeout))
 {
  printf("\nError setting timeout %d\n",GetLastError());
  eflag = -1 ;
 }
}

int AnalogPoll(unsigned char *Xbuffer, unsigned char *Rbuffer)
{
 short retry =0;
 DWORD BytesWritten, BytesRead, n;
 extern RTU Meter[TERMINALS];
 extern HANDLE hCom;
 extern int eflag;
 unsigned register i;

 while( (!WriteFile(hCom,Xbuffer,8,&BytesWritten,NULL)) & (retry < 2) )
  retry++;
 
 if ( (retry == 3) || (BytesWritten != 8) )
 {
  printf("\nWrite to Meter %d failed with %d\n",Meter[0].Request.SlavAddr,GetLastError());
  eflag = -1;
  return -1;
 }
 else
 {
  printf("\nTransmitted data = ");
  for(i=0;i<8;i++)
   printf("\t%2X",Xbuffer[i]);

  n = Meter[0].Request.ReadCount*2 + 5;
  
  retry = 0;
  while( (!ReadFile(hCom,Rbuffer,n,&BytesRead,NULL)) & (retry < 2) )
   retry++;

  
  if ( (retry == 3) || (BytesRead != n) )
  {
   printf("\nRead Error %d !\n",GetLastError());
   eflag = -1;
   return -1;
  }
  else
   printf("\nData Read = ");
   for(i=0;i<BytesRead;i++)
    printf("\t%2X",Rbuffer[i]);
 }
 return 0;
}