Отправить байт на COM-порт

Serial::Serial(char *portName)
{
    //We're not yet connected
    this->connected = false;
 
    //Try to connect to the given port throuh CreateFile
    this->hSerial = CreateFile(portName,
            GENERIC_READ | GENERIC_WRITE,
            0,
            NULL,
            OPEN_EXISTING,
            FILE_ATTRIBUTE_NORMAL,
            NULL);
 
    //Check if the connection was successfull
    if(this->hSerial==INVALID_HANDLE_VALUE)
    {
        //If not success full display an Error
        if(GetLastError()==ERROR_FILE_NOT_FOUND){
 
            //Print Error if neccessary
            printf("ERROR: Handle was not attached. Reason: %s not available.\n", portName);
 
        }
        else
        {
            printf("ERROR!!!");
        }
    }
    else
    {
        //If connected we try to set the comm parameters
        DCB dcbSerialParams = {0};
 
        //Try to get the current
        if (!GetCommState(this->hSerial, &dcbSerialParams))
        {
            //If impossible, show an error
            printf("failed to get current serial parameters!");
        }
        else
        {
            //Define serial connection parameters for the arduino board
            dcbSerialParams.BaudRate=CBR_9600;
            dcbSerialParams.ByteSize=8;
            dcbSerialParams.StopBits=ONESTOPBIT;
            dcbSerialParams.Parity=NOPARITY;
            //Setting the DTR to Control_Enable ensures that the Arduino is properly
            //reset upon establishing a connection
            dcbSerialParams.fDtrControl = DTR_CONTROL_ENABLE;
 
             //Set the parameters and check for their proper application
             if(!SetCommState(hSerial, &dcbSerialParams))
             {
                printf("ALERT: Could not set Serial Port parameters");
             }
             else
             {
                 //If everything went fine we're connected
                 this->connected = true;
                 //Flush any remaining characters in the buffers 
                 PurgeComm(this->hSerial, PURGE_RXCLEAR | PURGE_TXCLEAR);
                 //We wait 2s as the arduino board will be reseting
                 Sleep(ARDUINO_WAIT_TIME);
             }
        }
    }
 
}