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VB
    If MSComm1.PortOpen = True Then MSComm1.PortOpen = False
    MSComm1.CommPort = i1
    MSComm1.PortOpen = True
    MSComm1.InputMode = comInputModeBinary
    MSComm1.InBufferCount = 0
    MSComm1.InputLen = 0
    MSComm1.Settings = "9600,N,8,1"
    MSComm1.RThreshold = 1
    MSComm1.OutBufferCount = 0
C++
/****************************************************************/
//´®Ðпڳõʼ»¯
if(m_ctrlComm.GetPortOpen())   //Èç¹û´®¿ÚÒѾ­´ò¿ª£¬Ôò¹Ø±Õ¡£
  m_ctrlComm.SetPortOpen(FALSE);
m_ctrlComm.SetCommPort(1);    //Ñ¡Ôñcom1
if( !m_ctrlComm.GetPortOpen()) ×Ö´®9
  m_ctrlComm.SetPortOpen(TRUE);  //´ò¿ª´®¿Ú
else
  AfxMessageBox("²»ÄÜ´ò¿ª´®Ðпڣ¡");
m_ctrlComm.SetSettings("9600,n,8,1"); //²¨ÌØÂÊ9600£¬ÎÞУÑ飬8¸öÊý¾Ý룬1¸öֹͣλ
m_ctrlComm.SetInputMode(1);    //1£º±íʾÒÔ¶þ½øÖÆ·½Ê½¼ìÈ¡Êý¾Ý
m_ctrlComm.SetRThreshold(1);    //²ÎÊý1±íʾÿµ±´®¿Ú½ÓÊÕ»º³åÇøÖÐÓжàÓÚ»òµÈÓÚ1¸ö×Ö·ûʱ½«Òý·¢Ò»¸ö½ÓÊÕÊý¾ÝµÄOnCommʼþ
m_ctrlComm.SetInputLen(0);    //ÉèÖõ±Ç°½ÓÊÕÇøÊý¾Ý³¤¶ÈΪ0
m_ctrlComm.GetInput();     //ÏÈÔ¤¶Á»º³åÇøÒÔÇå³ý²ÐÁôÊý¾Ý
/****************************************************************/
C#
            if (this.axMSComm1.PortOpen == true)
                this.axMSComm1.PortOpen = false;
            this.axMSComm1.CommPort = 1;//¶Ë¿Ú  ×Ö´®2
            this.axMSComm1.Settings = "9600,n,8,1";//ͨÐŲÎÊý    
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