private int clearAnswer() throws Exception
    {
        int n = 0;

        while(n < this.MAX_TRIES && this.sendClearCommand() != 1)
        {
            if ( n > this.MAX_TRIES)
                throw new Exception("Достигнут максимальный лимит попыток");

            n += 1;
        }

        return 0;
    }