void
eMBRTUStop( void )
{
    ENTER_CRITICAL_SECTION(  );
    vMBPortSerialEnable( FALSE, FALSE );
    vMBPortTimersDisable(  );
    //关闭协议栈时，协议栈处于忙碌状态，需要初始化协议栈占用的资源，防止下一次打开时出现错误，保证下一次打开时，协议栈是一个新的状态
        if(eRcvState != STATE_RX_IDLE )   //接收过程中关闭协议栈
        {
            eRcvState = STATE_RX_INIT;
            usRcvBufferPos = 0;
            rt_memset((UCHAR *)ucRTUBuf,0,sizeof(ucRTUBuf));
        }
        if(eSndState != STATE_TX_IDLE)   //发送过程中关闭协议栈
        {
            eSndState = STATE_TX_IDLE;
            usSndBufferCount = 0;
            pucSndBufferCur = RT_NULL;
        }
    EXIT_CRITICAL_SECTION(  );
}