如何读取松下PLC的应答如数据

            string sReg = DTaddr1.Substring(0, 1);//获取"D"
            string sA1 = DTaddr1.Substring(1, DTaddr1.Length - 1);
            int iLen = Convert.ToInt16(sA1);
            sA1 = sA1.PadLeft(4).Replace(" ", "0");
            string sAddr = sReg + sA1;//地址：D00001
            string outStr = "";
            outStr = "%01#RD" + sAddr;
            outStr = outStr + bcc(outStr) + "/r";
            COMM.Write(outStr);
执行完读取命令后，如何读PLC返回的数据呢，请指教！！！