C# 串口通信（modbus），自动重连

（1）C#串口通信的例子，需要在线程里面执行。

private void Com2Ups40()
        {
            try
            {
                Logger.Info("执行函数Com2Ups40()------开始!!!");

                //UpsMaiDiSi = new SerialPortManager();
                serialPort = new SerialPort(_nameValueCollection["UPSMaiDiSi"], int.Parse(_nameValueCollection["UPSMaiDiSi_Rate"]), Parity.None, int.Parse(_nameValueCollection["UPSMaiDiSi_DataBit"]));

                Logger.Debug("MainWinViewModel()->Com2Ups40()->" + "00000000000000000000");
                serialPort.ReadTimeout = 2000;

                if (!serialPort.IsOpen)
                {
                    serialPort.Open();
                }

                Logger.Debug("MainWinViewModel()->Com2Ups40()->" + "444444444444444444444444444444");
                master40 = ModbusSerialMaster.CreateRtu(serialPort);

                //参数(分别为站号,起始地址,长度)
                byte slaveAddress = 1;
                ushort startAddress = 0;
                ushort numberOfPoints = 70;

                while (true)
                {

                    ushort[] registerBuffer = null;
                    try
                    {
                        registerBuffer = master40.ReadInputRegisters(slaveAddress, startAddress, numberOfPoints);
                    }
                    catch (Exception ex)
                    {
                        Logger.Debug("MainWinViewModel()->Com2Ups40()->ReadInputRegisters()" + ex);
                        continue;
                    }

                    //解析
                    for (int i = 0; i < registerBuffer.Length; i++)
                    {
                        if(registerBuffer[20].ToString().Length > 1)
                            srES = (registerBuffer[20].ToString()).Substring(0, (registerBuffer[20].ToString()).Length - 1);

                        if (registerBuffer[24].ToString().Length > 1)
                            srST = (registerBuffer[24].ToString()).Substring(0, (registerBuffer[24].ToString()).Length - 1);

                        if (registerBuffer[16].ToString().Length > 1)
                            srTR = (registerBuffer[16].ToString()).Substring(0, (registerBuffer[16].ToString()).Length - 1);

                        if (registerBuffer[34].ToString().Length > 1)
                            scE  = (registerBuffer[34].ToString()).Substring(0, (registerBuffer[34].ToString()).Length - 1);

                        if (registerBuffer[38].ToString().Length > 1)
                            scS = (registerBuffer[38].ToString()).Substring(0, (registerBuffer[38].ToString()).Length - 1);

                        if (registerBuffer[30].ToString().Length > 1)
                            scT = (registerBuffer[30].ToString()).Substring(0, (registerBuffer[30].ToString()).Length - 1);

                    }
   
                    Thread.Sleep(5000);
                }

 
            }
            catch (Exception ex)
            {
                Logger.Debug("MainWinViewModel()->Com2Ups40()->" + ex);
            }
        }