Serial communication with a device using RS232

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C++

Hi every body.

I try to communicate with a Temperature device with RS232.
After all i wrote a program. this program send and receive commands.
I use Hyper terminal to observe the behavior of program.
It works but it has an error. For example i send " i love you" and in hyper terminal i recieve this answer:"àøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàø
àøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàøàø
àøàøàøàø"
Furthermore i must send a "job number" to this temperature device.
=========================================================================
example: i must write : <2> <1> <8> <14> <5> <16> <3>
STX address status check job DLE ETX
0*08
=========================================================================
can you help me please to send some job number like this?:confused:

Here is my program:
=========================================================================

#include "stdafx.h"

#include <windows.h>
#include <stdlib.h>
#define ASCII_XON	0x11
#define ASCII_XOFF	0x13


// Global Port Handle COMX:
HANDLE hPort=0;

/***************** InitPort ****************************************/
bool InitPort(TCHAR szPort[6]){
	
	COMMTIMEOUTS	cto = {0,0,0,0,0};
	DCB dcb;

	hPort = CreateFile((LPCTSTR) szPort, GENERIC_READ|GENERIC_WRITE,0,NULL,
						OPEN_EXISTING,FILE_FLAG_RANDOM_ACCESS, NULL);

	if(hPort==INVALID_HANDLE_VALUE) return FALSE;

	if (!SetCommMask(hPort, EV_RXFLAG) ||
			!SetupComm(hPort, 4096, 4096)  ||
			!SetCommTimeouts(hPort, &cto)) return FALSE;

	dcb.DCBlength = sizeof(DCB);
	if (!GetCommState(hPort,&dcb)) return FALSE;

	dcb.DCBlength = sizeof(DCB);
	dcb.XonChar   = ASCII_XON;
	dcb.XoffChar  = ASCII_XOFF;
	dcb.XonLim    = 100;
	dcb.XoffLim   = 100;
	dcb.fBinary   = TRUE;
	dcb.fParity   = TRUE;
	dcb.BaudRate  = 9600; 
	dcb.ByteSize  = 8;  
	dcb.Parity    = NOPARITY; // NOPARITY; EVENPARITY; ODDPARITY; MARKPARITY; SPACEPARITY; 
	dcb.StopBits  = ONESTOPBIT; // ONESTOPBIT; TWOSTOPBITS;
	dcb.EvtChar   = 0x0A;		//   LF = 0x0A  CR =0x0D		

	if (!SetCommState(hPort,&dcb)){
		// printf("Error SetCommState \r\n");
		return FALSE;
	};

	// printf(" SetCommState ok \r\n");
	return  TRUE;
};
/********** End of InitPort ****************************************/



int main(int argc, char* argv[])
{

	char line[100];
	char command[9];
	char readChar='e';

	//char ChrCheck;
	DWORD dwLen = 0;
	DWORD dwBytes = 0;
	DWORD dwErr = 0;
	COMSTAT	comstat;	
  	DWORD dwWritten=0;
	int iCnt=0;


	if (!InitPort("COM1:")) {
		printf("Error Init COM-Port");
		return 1;
	}


	//for (iCnt=0; iCnt<10; iCnt++) {
	//	command[iCnt]=iCnt+40;
	//}
	command[0]=50;
	command[1]=51;
	command[2]=52;
	command[3]=53;
	command[4]=54;
	command[5]=55;
	command[6]=56;
	command[7]=0x0D;
	command[8]=0x0A;
	
	WriteFile(hPort, "Hello Terminal", strlen("Hallo Terminal"), &dwWritten, NULL);
	WriteFile(hPort, command, strlen(command), &dwWritten, NULL);
	printf("Stringlaenge: %d\n%d Bytes an COM1 geschrieben ...\n", strlen(command), dwWritten);

	readChar = getchar();

	while (readChar!='x') {

		if (ClearCommError(hPort,&dwErr,&comstat)) 
			printf("Buffer COM1 gelesen ...\n");
		else
			return 1;

		dwBytes = min(100, comstat.cbInQue);

		printf("Bytes in Buffer COM1 %d\n", dwBytes);

		if (dwBytes) {
			dwErr = ReadFile(hPort, line, dwBytes, &dwLen, NULL);
			printf("Buffer: %s\nAnzahl Zeichen in Buffer:%d\nAnzahl Zeichen gelesen:%d\n", line, dwBytes, dwLen);
		}

		readChar = getchar();


	} // end of loop: while (~dwBytes) 
	

	printf("Hello!\n");

	CloseHandle( hPort );	
	
	return 0;
}