2017-12-25 update 1 Serial Port Multistation fix

Modbus.Net/Modbus.Net.PersistedTests/Modbus.Net.PersistedTests.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net45; netcoreapp2.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Modbus.Net.Modbus\Modbus.Net.Modbus.csproj" />
+    <ProjectReference Include="..\Modbus.Net.Siemens\Modbus.Net.Siemens.csproj" />
+    <ProjectReference Include="..\Modbus.Net\Modbus.Net.csproj" />
+  </ItemGroup>
+
+</Project>

Modbus.Net/Modbus.Net.PersistedTests/Program.cs

@@ -0,0 +1,147 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Modbus.Net.Modbus;
+using Serilog;
+
+namespace Modbus.Net.PersistedTests
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Log.Logger = new LoggerConfiguration().MinimumLevel.Verbose().WriteTo.Console().CreateLogger();
+
+            IMachineProperty<int> machine = new ModbusMachine<int, string>(1, ModbusType.Rtu, "COM1",
+                new List<AddressUnit>()
+                {
+                    new AddressUnit()
+                    {
+                        Id = "1",
+                        Area = "4X",
+                        Address = 1,
+                        Name = "test 1",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "2",
+                        Area = "4X",
+                        Address = 2,
+                        Name = "test 2",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "3",
+                        Area = "4X",
+                        Address = 3,
+                        Name = "test 3",
+                        DataType = typeof(ushort)
+                    },
+                }, true, 2, 1);
+            IMachineProperty<int> machine2 = new ModbusMachine<int, string>(2, ModbusType.Rtu, "COM1",
+                new List<AddressUnit>()
+                {
+                    new AddressUnit()
+                    {
+                        Id = "1",
+                        Area = "4X",
+                        Address = 11,
+                        Name = "test 1",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "2",
+                        Area = "4X",
+                        Address = 12,
+                        Name = "test 2",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "3",
+                        Area = "4X",
+                        Address = 13,
+                        Name = "test 3",
+                        DataType = typeof(ushort)
+                    },
+                }, true, 3, 1);
+            IMachineProperty<int> machine3 = new ModbusMachine<int, string>(3, ModbusType.Rtu, "COM1",
+                new List<AddressUnit>()
+                {
+                    new AddressUnit()
+                    {
+                        Id = "1",
+                        Area = "4X",
+                        Address = 21,
+                        Name = "test 1",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "2",
+                        Area = "4X",
+                        Address = 22,
+                        Name = "test 2",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "3",
+                        Area = "4X",
+                        Address = 23,
+                        Name = "test 3",
+                        DataType = typeof(ushort)
+                    },
+                }, true, 4, 1);
+
+            TaskManager<int> manager = new TaskManager<int>(20, true);
+            manager.AddMachines<string>(new List<IMachineProperty<int>>{machine, machine2, machine3});
+            Random r = new Random();
+            manager.InvokeTimerAll(new TaskItemSetData(()=>new Dictionary<string, double>
+            {
+                {
+                    "4X 1.0", r.Next()%65536
+                },
+                {
+                    "4X 2.0", r.Next()%65536
+                },
+                {
+                    "4X 3.0", r.Next()%65536
+                },
+                {
+                    "4X 11.0", r.Next()%65536
+                },
+                {
+                    "4X 12.0", r.Next()%65536
+                },
+                {
+                    "4X 13.0", r.Next()%65536
+                },
+                {
+                    "4X 21.0", r.Next()%65536
+                },
+                {
+                    "4X 22.0", r.Next()%65536
+                },
+                {
+                    "4X 23.0", r.Next()%65536
+                },
+            }, MachineSetDataType.Address, 10000, 10000));
+            Thread.Sleep(5000);
+            manager.InvokeTimerAll(new TaskItemGetData(data =>
+            {
+                foreach (var dataInner in data.ReturnValues)
+                {
+                    Console.WriteLine(dataInner.Key + " " + dataInner.Value.PlcValue);
+                }
+               
+            }, MachineGetDataType.Address, 10000, 10000));
+
+            Console.Read();
+            Console.Read();
+        }
+    }
+}

Modbus.Net/Modbus.Net.sln

@@ -30,6 +30,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CrossLamp", "..\Samples\Cro
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AnyType", "..\Samples\AnyType\AnyType.csproj", "{25FABD48-D82E-4E08-91A4-46F7057EC954}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Modbus.Net.PersistedTests", "Modbus.Net.PersistedTests\Modbus.Net.PersistedTests.csproj", "{5BFCA3D4-D809-485E-B69C-6F80A6A917D4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -72,6 +74,10 @@ Global
 		{25FABD48-D82E-4E08-91A4-46F7057EC954}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{25FABD48-D82E-4E08-91A4-46F7057EC954}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{25FABD48-D82E-4E08-91A4-46F7057EC954}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5BFCA3D4-D809-485E-B69C-6F80A6A917D4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5BFCA3D4-D809-485E-B69C-6F80A6A917D4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5BFCA3D4-D809-485E-B69C-6F80A6A917D4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5BFCA3D4-D809-485E-B69C-6F80A6A917D4}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -82,6 +88,7 @@ Global
 		{2D939825-8459-438A-AC82-4C67A73E373E} = {145DA93A-6768-4D98-8512-AB22339933F7}
 		{41F40C27-AB1A-4153-BBAD-BFC7BD57B380} = {145DA93A-6768-4D98-8512-AB22339933F7}
 		{25FABD48-D82E-4E08-91A4-46F7057EC954} = {145DA93A-6768-4D98-8512-AB22339933F7}
+		{5BFCA3D4-D809-485E-B69C-6F80A6A917D4} = {D8DD32FC-CF39-4A1A-8FBF-9E82C5278C34}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {AF00D64E-3C70-474A-8A81-E9E48017C4B5}

Modbus.Net/Modbus.Net/BaseConnector.cs

@@ -30,7 +30,7 @@ namespace Modbus.Net
         /// <summary>
         ///     传输控制器
         /// </summary>
-        protected IController Controller { get; set; }
+        protected virtual IController Controller { get; set; }
 
         /// <summary>
         ///     标识Connector的连接关键字

Modbus.Net/Modbus.Net/BaseController.cs

@@ -30,7 +30,7 @@ namespace Modbus.Net
             WaitingMessages = new List<MessageWaitingDef>();
         }
 
-        /// <inheritdoc cref="IController.AddMessage(byte[])" />
+        /// <inheritdoc />
         public MessageWaitingDef AddMessage(byte[] sendMessage)
         {
             var def = new MessageWaitingDef
@@ -40,8 +40,11 @@ namespace Modbus.Net
                 SendMutex = new AutoResetEvent(false),
                 ReceiveMutex = new AutoResetEvent(false)
             };
-            AddMessageToList(def);         
+            if (AddMessageToList(def))
-            return def;
+            {
+                return def;
+            }
+            return null;
         }
 
         /// <summary>
@@ -49,10 +52,10 @@ namespace Modbus.Net
         /// </summary>
         protected abstract void SendingMessageControlInner();
 
-        /// <inheritdoc cref="IController.SendStop" />
+        /// <inheritdoc />
         public abstract void SendStop();
 
-        /// <inheritdoc cref="IController.SendStart" />
+        /// <inheritdoc />
         public void SendStart()
         {
             if (SendingThread == null)
@@ -61,7 +64,7 @@ namespace Modbus.Net
             }
         }
 
-        /// <inheritdoc cref="IController.Clear" />
+        /// <inheritdoc />
         public void Clear()
         {
             lock (WaitingMessages)
@@ -74,11 +77,16 @@ namespace Modbus.Net
         ///     将信息添加到队列
         /// </summary>
         /// <param name="def">需要添加的信息信息</param>
-        protected virtual void AddMessageToList(MessageWaitingDef def)
+        protected virtual bool AddMessageToList(MessageWaitingDef def)
         {
             lock (WaitingMessages)
             {
-                WaitingMessages.Add(def);
+                if (WaitingMessages.FirstOrDefault(p => p.Key == def.Key) == null)
+                {
+                    WaitingMessages.Add(def);
+                    return true;
+                }
+                return false;
             }
         }
 
@@ -89,7 +97,7 @@ namespace Modbus.Net
         /// <returns>信息的检索关键字</returns>
         protected abstract string GetKeyFromMessage(byte[] message);
 
-        /// <inheritdoc cref="IController.ConfirmMessage(byte[])" />
+        /// <inheritdoc />
         public bool ConfirmMessage(byte[] receiveMessage)
         {
             var def = GetMessageFromWaitingList(receiveMessage);

Modbus.Net/Modbus.Net/ComConnector.cs

@@ -108,6 +108,28 @@ namespace Modbus.Net
         private static Dictionary<string, SerialPortLock> Connectors { get; } = new Dictionary<string, SerialPortLock>()
             ;
 
+        private static Dictionary<string, IController> Controllers { get; } = new Dictionary<string, IController>()
+            ;
+
+        /// <inheritdoc />
+        protected override IController Controller {
+            get
+            {
+                if (Controllers.ContainsKey(_com))
+                {
+                    return Controllers[_com];
+                }
+                return null;
+            }
+            set
+            {
+                if (!Controllers.ContainsKey(_com))
+                {
+                    Controllers.Add(_com, value);
+                }
+            } 
+        }
+
         /// <summary>
         ///     连接中的连接器
         /// </summary>
@@ -272,9 +294,7 @@ namespace Modbus.Net
 
         #region 发送接收数据
 
-        /// <summary>
+        /// <inheritdoc />
-        ///     是否正在连接
-        /// </summary>
         public override bool IsConnected
         {
             get
@@ -293,31 +313,33 @@ namespace Modbus.Net
         {
             try
             {
-                if (!Connectors.ContainsKey(_com))
+                lock (Connectors)
                 {
-                    Connectors.Add(_com, new SerialPortLock
+                    if (!Connectors.ContainsKey(_com))
                     {
-                        PortName = _com,
+                        Connectors.Add(_com, new SerialPortLock
-                        BaudRate = _baudRate,
+                        {
-                        Parity = _parity,
+                            PortName = _com,
-                        StopBits = _stopBits,
+                            BaudRate = _baudRate,
-                        DataBits = _dataBits,
+                            Parity = _parity,
-                        ReadTimeout = _timeoutTime
+                            StopBits = _stopBits,
-                    });
+                            DataBits = _dataBits,
-                }
+                            ReadTimeout = _timeoutTime
-                if (!Linkers.ContainsKey(_slave))
+                        });
-                {
+                    }
-                    Linkers.Add(_slave, _com);
+                    if (!Linkers.ContainsKey(_slave))
-                }
-                if (!SerialPort.IsOpen)
-                {
-                    lock (SerialPort)
                     {
-                        SerialPort.Open();
+                        Linkers.Add(_slave, _com);
-                        ReceiveMsgThreadStart();
+                    }
+                    if (!SerialPort.IsOpen)
+                    {
+                        lock (SerialPort)
+                        {
+                            SerialPort.Open();
+                            ReceiveMsgThreadStart();
+                        }
                     }
                 }
-
                 Controller.SendStart();
 
                 Log.Information("Com client {ConnectionToken} connect success", ConnectionToken);
@@ -331,19 +353,13 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
+        /// <inheritdoc />
-        ///     连接串口
-        /// </summary>
-        /// <returns>是否连接成功</returns>
         public override Task<bool> ConnectAsync()
         {
             return Task.FromResult(Connect());
         }
 
-        /// <summary>
+        /// <inheritdoc />
-        ///     断开串口
-        /// </summary>
-        /// <returns>是否断开成功</returns>
         public override bool Disconnect()
         {
             if (Linkers.ContainsKey(_slave) && Connectors.ContainsKey(_com))
@@ -415,15 +431,11 @@ namespace Modbus.Net
             return AsyncHelper.RunSync(() => SendMsgAsync(message));
         }
 
-        /// <summary>
+        /// <inheritdoc />
-        ///     发送数据，需要返回
-        /// </summary>
-        /// <param name="message">发送的数据</param>
-        /// <returns>是否发送成功</returns>
         public override async Task<byte[]> SendMsgAsync(byte[] message)
         {
             CheckOpen();
-            var task = SendMsgInner(message).WithCancellation(new CancellationTokenSource(10000).Token);
+            var task = SendMsgInner(message).WithCancellation(new CancellationTokenSource(100000).Token);
             var ans = await task;
             if (task.IsCanceled)
             {
@@ -434,38 +446,35 @@ namespace Modbus.Net
         }
 
         private async Task<MessageWaitingDef> SendMsgInner(byte[] message)
-        {
-            var messageSendingdef = Controller.AddMessage(message);
-            messageSendingdef.SendMutex.WaitOne();
-            await SendMsgWithoutConfirm(message);
-            messageSendingdef.ReceiveMutex.WaitOne();
-            return messageSendingdef;
-        }
-
-        /// <summary>
-        ///     发送数据，不确认
-        /// </summary>
-        /// <param name="message">需要发送的数据</param>
-        protected override async Task SendMsgWithoutConfirm(byte[] message)
         {
             using (await SerialPort.Lock.LockAsync())
             {
-                try
+                var messageSendingdef = Controller.AddMessage(message);
-                {
+                messageSendingdef.SendMutex.WaitOne();
-                    Log.Verbose("Com client {ConnectionToken} send msg length: {Length}", ConnectionToken,
+                await SendMsgWithoutConfirm(message);
-                        message.Length);
+                messageSendingdef.ReceiveMutex.WaitOne();
-                    Log.Verbose(
+                return messageSendingdef;
-                        $"Com client {ConnectionToken} send msg: {String.Concat(message.Select(p => " " + p.ToString("X2")))}");
-                    await Task.Run(()=>SerialPort.Write(message, 0, message.Length));
-                }
-                catch (Exception err)
-                {
-                    Log.Error(err, "Com client {ConnectionToken} send msg error", ConnectionToken);
-                }
-                RefreshSendCount();
             }
         }
 
+        /// <inheritdoc />
+        protected override async Task SendMsgWithoutConfirm(byte[] message)
+        {
+            try
+            {
+                Log.Verbose("Com client {ConnectionToken} send msg length: {Length}", ConnectionToken,
+                    message.Length);
+                Log.Verbose(
+                    $"Com client {ConnectionToken} send msg: {String.Concat(message.Select(p => " " + p.ToString("X2")))}");
+                await Task.Run(() => SerialPort.Write(message, 0, message.Length));
+            }
+            catch (Exception err)
+            {
+                Log.Error(err, "Com client {ConnectionToken} send msg error", ConnectionToken);
+            }
+            RefreshSendCount();
+        }
+
         /// <inheritdoc />
         protected override void ReceiveMsgThreadStart()
         {
@@ -497,8 +506,9 @@ namespace Modbus.Net
                         {
                             //主动传输事件
                         }
+
+                        RefreshReceiveCount();
                     }                   
-                    RefreshReceiveCount();
 
                     Thread.Sleep(500);
                 }
@@ -515,9 +525,8 @@ namespace Modbus.Net
             {
                 CheckOpen();
 
-                byte[] data;
                 Thread.Sleep(100);
-                var i = ReadComm(out data, 10, 5000, 1000);
+                var i = ReadComm(out var data, 10, 5000, 1000);
                 if (i > 0)
                 {
                     var returndata = new byte[i];

Modbus.Net/Modbus.Net/FifoController.cs

@@ -31,7 +31,7 @@ namespace Modbus.Net
             AcquireTime = acquireTime;
         }
 
-        /// <inheritdoc cref="BaseController.SendingMessageControlInner"/>
+        /// <inheritdoc />
         protected override void SendingMessageControlInner()
         {
             try
@@ -54,14 +54,9 @@ namespace Modbus.Net
                         if (_currentSendingPos != null)
                         {
                             _currentSendingPos.SendMutex.Set();
-                            if (WaitingMessages.Count <= 1)
+                            _currentSendingPos = WaitingMessages.Count <= 1
-                            {
+                                ? null
-                                _currentSendingPos = null;
+                                : WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
-                            }
-                            else
-                            {
-                                _currentSendingPos = WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
-                            }
                         }
                     }
                 }
@@ -77,19 +72,19 @@ namespace Modbus.Net
 
         }
 
-        /// <inheritdoc cref="BaseController.SendStop"/>
+        /// <inheritdoc />
         public override void SendStop()
         {
             _taskCancel = true;
         }
 
-        /// <inheritdoc cref="BaseController.GetKeyFromMessage(byte[])"/>
+        /// <inheritdoc />
         protected override string GetKeyFromMessage(byte[] message)
         {
             return null;
         }
 
-        /// <inheritdoc cref="BaseController.GetMessageFromWaitingList(byte[])"/>
+        /// <inheritdoc />
         protected override MessageWaitingDef GetMessageFromWaitingList(byte[] receiveMessage)
         {
             return WaitingMessages.FirstOrDefault();

Modbus.Net/Modbus.Net/MatchController.cs

@@ -38,7 +38,7 @@ namespace Modbus.Net
             AcquireTime = acquireTime;
         }
 
-        /// <inheritdoc cref="BaseController.SendingMessageControlInner" />
+        /// <inheritdoc />
         protected override void SendingMessageControlInner()
         {
             try
@@ -61,14 +61,9 @@ namespace Modbus.Net
                         if (_currentSendingPos != null)
                         {
                             _currentSendingPos.SendMutex.Set();
-                            if (WaitingMessages.Count <= 1)
+                            _currentSendingPos = WaitingMessages.Count <= 1
-                            {
+                                ? null
-                                _currentSendingPos = null;
+                                : WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
-                            }
-                            else
-                            {
-                                _currentSendingPos = WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
-                            }
                         }
                     }
                 }
@@ -84,13 +79,13 @@ namespace Modbus.Net
 
         }
 
-        /// <inheritdoc cref="BaseController.SendStop" />
+        /// <inheritdoc />
         public override void SendStop()
         {
             _taskCancel = false;
         }
 
-        /// <inheritdoc cref="BaseController.GetKeyFromMessage(byte[])" />
+        /// <inheritdoc />
         protected override string GetKeyFromMessage(byte[] message)
         {
             string ans = "";
@@ -106,7 +101,7 @@ namespace Modbus.Net
             return ans;
         }
 
-        /// <inheritdoc cref="BaseController.GetMessageFromWaitingList(byte[])" />
+        /// <inheritdoc />
         protected override MessageWaitingDef GetMessageFromWaitingList(byte[] receiveMessage)
         {
             var returnKey = GetKeyFromMessage(receiveMessage);

Modbus.Net/Modbus.Net/TaskManager.cs

@@ -691,7 +691,7 @@ namespace Modbus.Net
         /// <param name="machines">多台设备</param>
         public void AddMachines(IEnumerable<BaseMachine> machines)
         {
-            base.AddMachines(machines);
+            base.AddMachines<string>(machines);
         }
 
         /// <summary>
@@ -699,9 +699,9 @@ namespace Modbus.Net
         /// </summary>
         /// <param name="id">设备Id</param>
         /// <returns>获取的设备</returns>
-        public BaseMachine GetMachineById(string id)
+        public new BaseMachine GetMachineById(string id)
         {
-            return base.GetMachineById<string>(id) as BaseMachine;
+            return base.GetMachineById(id) as BaseMachine;
         }
 
         /// <summary>
@@ -709,9 +709,9 @@ namespace Modbus.Net
         /// </summary>
         /// <param name="connectionToken">通讯标志</param>
         /// <returns>获取的设备</returns>
-        public BaseMachine GetMachineByConnectionToken(string connectionToken)
+        public new BaseMachine GetMachineByConnectionToken(string connectionToken)
         {
-            return base.GetMachineByConnectionToken<string>(connectionToken) as BaseMachine;
+            return base.GetMachineByConnectionToken(connectionToken) as BaseMachine;
         }
     }
 
@@ -808,8 +808,7 @@ namespace Modbus.Net
         ///     添加一台设备
         /// </summary>
         /// <param name="machine">设备</param>
-        public void AddMachine<TUnitKey>(BaseMachine<TMachineKey, TUnitKey> machine)
+        public void AddMachine(IMachineProperty<TMachineKey> machine)
-            where TUnitKey : IEquatable<TUnitKey>
         {
             machine.KeepConnect = KeepConnect;
             lock (_machines)
@@ -822,7 +821,7 @@ namespace Modbus.Net
         ///     添加多台设备
         /// </summary>
         /// <param name="machines">设备的列表</param>
-        public void AddMachines<TUnitKey>(IEnumerable<BaseMachine<TMachineKey, TUnitKey>> machines)
+        public void AddMachines<TUnitKey>(IEnumerable<IMachineProperty<TMachineKey>> machines)
             where TUnitKey : IEquatable<TUnitKey>
         {
             foreach (var machine in machines)
@@ -832,11 +831,9 @@ namespace Modbus.Net
         /// <summary>
         ///     通过Id获取设备
         /// </summary>
-        /// <typeparam name="TUnitKey">设备地址Id的类型</typeparam>
         /// <param name="id">设备的Id</param>
         /// <returns>获取设备</returns>
-        public BaseMachine<TMachineKey, TUnitKey> GetMachineById<TUnitKey>(TMachineKey id)
+        public IMachineProperty<TMachineKey> GetMachineById(TMachineKey id)
-            where TUnitKey : IEquatable<TUnitKey>
         {
             try
             {
@@ -845,7 +842,7 @@ namespace Modbus.Net
                 {
                     machine = _machines.SingleOrDefault(p => p.Machine.Id.Equals(id));
                 }
-                return machine?.Machine as BaseMachine<TMachineKey, TUnitKey>;
+                return machine?.Machine;
             }
             catch (Exception e)
             {
@@ -857,11 +854,9 @@ namespace Modbus.Net
         /// <summary>
         ///     通过通讯标志获取设备
         /// </summary>
-        /// <typeparam name="TUnitKey">设备地址Id的类型</typeparam>
         /// <param name="connectionToken">通讯标志</param>
         /// <returns>获取的数据</returns>
-        public BaseMachine<TMachineKey, TUnitKey> GetMachineByConnectionToken<TUnitKey>(string connectionToken)
+        public IMachineProperty<TMachineKey> GetMachineByConnectionToken(string connectionToken)
-            where TUnitKey : IEquatable<TUnitKey>
         {
             try
             {
@@ -870,7 +865,7 @@ namespace Modbus.Net
                 {
                     machine = _machines.SingleOrDefault(p => p.Machine.ConnectionToken == connectionToken && p.Machine.IsConnected);
                 }
-                return machine?.Machine as BaseMachine<TMachineKey, TUnitKey>;
+                return machine?.Machine;
             }
             catch (Exception e)
             {