02  80  A8  B1  93  FA  BD  B1  93  03    <-------시리얼로 들어오는 데이터 형식
i=   0    1    2   3    4     5    6     7    8    9

3번째 하위와 4번째 데이터값만을 Memo1에 쓰는데.... 가끔 엉뚱한 데이터가 나옵니다.
간혹  다음 데이터를 수신할때도 있고 그렇습니다. 어떤식으로 해결해야할까요?
ㅠㅠ 답변 간절히 기다릴께요.

//------------시리얼 수신쪽 ----------------------------------------
DWORD ReadThread (LPDWORD lpdwParam1)
{
    char datain[BUFSIZ];
    DWORD data_Buff;

    if (!(cp.dwProvCapabilities & PCF_INTTIMEOUTS))
        return 1L;

    memset (&to, 0, sizeof(to));
    to.ReadIntervalTimeout = MAXDWORD;
    SetCommTimeouts (hComm, &to);
              
    while (bReading) {                
        if (!ReadFile(hComm, inbuff, BUFSIZ, &data_Buff, NULL))
                                      {
            locProcessCommError(GetLastError ());
              }
        else
                                     {
            if(data_Buff)
                          Form1->ProcessBytes(inbuff, data_Buff);
             }
                     }
    PurgeComm(hComm, PURGE_RXCLEAR|PURGE_TXCLEAR);
    return 0L;
}
//------------------------------------------------------------
void __fastcall TForm1::RS232_Read( char *datain, int  data_Buff)
{
    int     i;
    AnsiString strTemp;
    BYTE data;

   for( i=0; i<data_Buff; i++)
        {

              if(i==3)
              {
                data=0x0f & idatain[i];
                strTemp = Format("%2x", ARRAYOFCONST((data)));
                Memo1->Text=Memo1->Text+(strTemp);
              }

              if(i==4)
               {
                data=idatain[i];
                strTemp = Format("%.2x", ARRAYOFCONST((data)));
                Memo1->Text=Memo1->Text+(strTemp);
              }
    }
}
//------------------------------------------------------------