diff --git a/Modbus.Net/Modbus.Net/BaseConnector.cs b/Modbus.Net/Modbus.Net/BaseConnector.cs
index cefc94e..3335596 100644
--- a/Modbus.Net/Modbus.Net/BaseConnector.cs
+++ b/Modbus.Net/Modbus.Net/BaseConnector.cs
@@ -38,33 +38,11 @@ namespace Modbus.Net
         /// <inheritdoc />
         public override async Task<byte[]> SendMsgAsync(byte[] message)
         {
-            var ans = await SendMsgCtrl(message);
+            var ans = await SendMsgInner(message);
             if (ans == null) return new byte[0];
             return ans.ReceiveMessage;
         }
 
-        /// <summary>
-        ///     发送主控
-        /// </summary>
-        /// <param name="message">发送的信息</param>
-        /// <returns>等待信息的定义</returns>
-        protected async Task<MessageWaitingDef> SendMsgCtrl(byte[] message)
-        {
-            MessageWaitingDef ans;
-            if (!IsFullDuplex)
-            {
-                using (await Lock.LockAsync())
-                {
-                    ans = await SendMsgInner(message);
-                }
-            }
-            else
-            {
-                ans = await SendMsgInner(message);
-            }
-            return ans;
-        }
-
         /// <summary>
         ///     发送内部
         /// </summary>
@@ -72,11 +50,16 @@ namespace Modbus.Net
         /// <returns>发送信息的定义</returns>
         protected async Task<MessageWaitingDef> SendMsgInner(byte[] message)
         {
+            IDisposable asyncLock = null;
             try
-            {
+            {                
                 var messageSendingdef = Controller.AddMessage(message);
                 if (messageSendingdef != null)
                 {
+                    if (!IsFullDuplex)
+                    {
+                        asyncLock = await Lock.LockAsync();
+                    }
                     var success = messageSendingdef.SendMutex.WaitOne(TimeoutTime);
                     if (success)
                     {
@@ -89,6 +72,7 @@ namespace Modbus.Net
                     }
                     Controller.ForceRemoveWaitingMessage(messageSendingdef);
                 }
+                Log.Information("Message is waiting in {0}. Cancel!", ConnectionToken);
                 return null;
             }
             catch (Exception e)
@@ -96,7 +80,10 @@ namespace Modbus.Net
                 Log.Error(e, "Connector {0} Send Error.", ConnectionToken);
                 return null;
             }
-            
+            finally
+            {
+                asyncLock?.Dispose();
+            }
         }
     }
 
diff --git a/Modbus.Net/Modbus.Net/TaskManager.cs b/Modbus.Net/Modbus.Net/TaskManager.cs
index ef0c7cf..aeceeee 100644
--- a/Modbus.Net/Modbus.Net/TaskManager.cs
+++ b/Modbus.Net/Modbus.Net/TaskManager.cs
@@ -409,16 +409,26 @@ namespace Modbus.Net
             {
                 var cts = new CancellationTokenSource();
                 cts.CancelAfter(TimeSpan.FromMilliseconds(timeoutTime));
-                var ans =
-                    await tasks.StartNew(
-                        async () => await machine.GetMachineMethods<IMachineMethodData>()
-                            .GetDatasAsync(
-                            getDataType).WithCancellation(cts.Token)).Unwrap();
-                return new DataReturnDef
+                try
                 {
-                    MachineId = machine.GetMachineIdString(),
-                    ReturnValues = ans
-                };
+                    var ans =
+                        await tasks.StartNew(
+                            async () => await machine.GetMachineMethods<IMachineMethodData>()
+                                .GetDatasAsync(
+                                    getDataType).WithCancellation(cts.Token)).Unwrap();
+                    return new DataReturnDef
+                    {
+                        MachineId = machine.GetMachineIdString(),
+                        ReturnValues = ans
+                    };
+                }
+                catch (Exception e)
+                {
+                    Log.Error(e, "GetData task has been canceled.");
+                    machine.Disconnect();
+                }
+                return null;
+
             };
             Params = null;
             Return = returnFunc;
@@ -460,12 +470,21 @@ namespace Modbus.Net
             {
                 var cts = new CancellationTokenSource();
                 cts.CancelAfter(TimeSpan.FromMilliseconds(timeoutTime));
-                var ans =
-                    await tasks.StartNew(
-                        async () => await machine.GetMachineMethods<IMachineMethodData>().
-                            SetDatasAsync(setDataType, (Dictionary<string, double>)parameters[0]
-                            ).WithCancellation(cts.Token)).Unwrap();
-                return ans;
+                try
+                {
+                    var ans =
+                        await tasks.StartNew(
+                            async () => await machine.GetMachineMethods<IMachineMethodData>().
+                                SetDatasAsync(setDataType, (Dictionary<string, double>)parameters[0]
+                                ).WithCancellation(cts.Token)).Unwrap();
+                    return ans;
+                }
+                catch (Exception e)
+                {
+                    Log.Error(e, "SetData task has been canceled.");
+                    machine.Disconnect();
+                }
+                return false;
             };
             Params = () => new object[] {values()};
             Return = returnFunc;