diff --git a/Modbus.Net/Modbus.Net/BaseConnector.cs b/Modbus.Net/Modbus.Net/BaseConnector.cs
index 85c5792..b14b680 100644
--- a/Modbus.Net/Modbus.Net/BaseConnector.cs
+++ b/Modbus.Net/Modbus.Net/BaseConnector.cs
@@ -1,12 +1,102 @@
-using System.Threading.Tasks;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Nito.AsyncEx;
+using Serilog;
 
 namespace Modbus.Net
 {
-    /// <summary>
-    ///     基础的协议连接类
-    /// </summary>
+    /// <inheritdoc />
     public abstract class BaseConnector : BaseConnector<byte[], byte[]>
     {
+        /// <summary>
+        ///     发送锁
+        /// </summary>
+        protected abstract AsyncLock Lock { get; }
+        
+        /// <summary>
+        ///     是否为全双工
+        /// </summary>
+        public bool IsFullDuplex { get; }
+
+        /// <summary>
+        ///     发送超时时间
+        /// </summary>
+        protected abstract int TimeoutTime { get; set; }
+
+        /// <summary>
+        ///     构造器
+        /// </summary>
+        /// <param name="timeoutTime">发送超时时间</param>
+        /// <param name="isFullDuplex">是否为全双工</param>
+        protected BaseConnector(int timeoutTime = 10000, bool isFullDuplex = true)
+        {
+            IsFullDuplex = isFullDuplex;
+            TimeoutTime = timeoutTime;
+        }
+
+        /// <inheritdoc />
+        public override async Task<byte[]> SendMsgAsync(byte[] message)
+        {
+            var ans = await SendMsgCtrl(message);
+            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>
+        /// <param name="message">发送的信息</param>
+        /// <returns>发送信息的定义</returns>
+        protected async Task<MessageWaitingDef> SendMsgInner(byte[] message)
+        {
+            try
+            {
+                var messageSendingdef = Controller.AddMessage(message);
+                if (messageSendingdef != null)
+                {
+                    var success = messageSendingdef.SendMutex.WaitOne(TimeoutTime);
+                    if (success)
+                    {
+                        await SendMsgWithoutConfirm(message);
+                        success = messageSendingdef.ReceiveMutex.WaitOne(TimeoutTime);
+                        if (success)
+                        {
+                            return messageSendingdef;
+                        }
+                    }
+                    Controller.ForceRemoveWaitingMessage(messageSendingdef);
+                }
+                return null;
+            }
+            catch (Exception e)
+            {
+                Log.Error(e, "Connector {0} Send Error.", ConnectionToken);
+                return null;
+            }
+            
+        }
     }
 
     /// <summary>
@@ -32,33 +122,19 @@ namespace Modbus.Net
         /// </summary>
         protected virtual IController Controller { get; set; }
 
-        /// <summary>
-        ///     标识Connector的连接关键字
-        /// </summary>
+        /// <inheritdoc />
         public abstract string ConnectionToken { get; }
 
-        /// <summary>
-        ///     是否处于连接状态
-        /// </summary>
+        /// <inheritdoc />
         public abstract bool IsConnected { get; }
 
-        /// <summary>
-        ///     连接PLC，异步
-        /// </summary>
-        /// <returns>是否连接成功</returns>
+        /// <inheritdoc />
         public abstract Task<bool> ConnectAsync();
 
-        /// <summary>
-        ///     断开PLC
-        /// </summary>
-        /// <returns>是否断开成功</returns>
+        /// <inheritdoc />
         public abstract bool Disconnect();
 
-        /// <summary>
-        ///     带返回发送数据
-        /// </summary>
-        /// <param name="message">需要发送的数据</param>
-        /// <returns>是否发送成功</returns>
+        /// <inheritdoc />
         public abstract Task<TParamOut> SendMsgAsync(TParamIn message);
 
         /// <summary>
diff --git a/Modbus.Net/Modbus.Net/ComConnector.cs b/Modbus.Net/Modbus.Net/ComConnector.cs
index 1f35cc2..0da1861 100644
--- a/Modbus.Net/Modbus.Net/ComConnector.cs
+++ b/Modbus.Net/Modbus.Net/ComConnector.cs
@@ -1,9 +1,7 @@
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.IO.Ports;
 using System.Linq;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Nito.AsyncEx;
@@ -57,17 +55,29 @@ namespace Modbus.Net
         /// </summary>
         private readonly StopBits _stopBits;
 
+        /// <inheritdoc />
+        protected override int TimeoutTime { get; set; }
+
         /// <summary>
-        ///     超时时间
+        ///     错误次数
         /// </summary>
-        private readonly int _timeoutTime;
-
         private int _errorCount;
+        /// <summary>
+        ///     获取次数
+        /// </summary>
         private int _receiveCount;
-
+        /// <summary>
+        ///     发送次数
+        /// </summary>
         private int _sendCount;
 
+        /// <summary>
+        ///     获取线程
+        /// </summary>
         private Task _receiveThread;
+        /// <summary>
+        ///     获取线程关闭
+        /// </summary>
         private bool _taskCancel = false;
 
         /// <summary>
@@ -84,12 +94,11 @@ namespace Modbus.Net
         /// <param name="stopBits">停止位</param>
         /// <param name="dataBits">数据位</param>
         /// <param name="timeoutTime">超时时间</param>
-        public ComConnector(string com, int baudRate, Parity parity, StopBits stopBits, int dataBits, int timeoutTime)
+        /// <param name="isFullDuplex">是否为全双工</param>
+        public ComConnector(string com, int baudRate, Parity parity, StopBits stopBits, int dataBits, int timeoutTime = 10000, bool isFullDuplex = false) : base(timeoutTime, isFullDuplex)
         {
             //端口号 
             _com = com.Split(':')[0];
-            //读超时
-            _timeoutTime = timeoutTime;
             //波特率
             _baudRate = baudRate;
             //奇偶校验
@@ -108,6 +117,9 @@ namespace Modbus.Net
         private static Dictionary<string, SerialPortLock> Connectors { get; } = new Dictionary<string, SerialPortLock>()
             ;
 
+        /// <summary>
+        ///     连接中的连接器
+        /// </summary>
         private static Dictionary<string, IController> Controllers { get; } = new Dictionary<string, IController>()
             ;
 
@@ -130,6 +142,9 @@ namespace Modbus.Net
             } 
         }
 
+        /// <inheritdoc />
+        protected override AsyncLock Lock => SerialPort.Lock;
+
         /// <summary>
         ///     连接中的连接器
         /// </summary>
@@ -140,6 +155,9 @@ namespace Modbus.Net
         /// </summary>
         public override string ConnectionToken => _slave + ":" + _com;
 
+        /// <summary>
+        ///     获取当前连接器使用的串口
+        /// </summary>
         private SerialPortLock SerialPort
         {
             get
@@ -150,9 +168,7 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
-        ///     实现IDisposable接口
-        /// </summary>
+        /// <inheritdoc />
         public void Dispose()
         {
             Dispose(true);
@@ -292,8 +308,6 @@ namespace Modbus.Net
             Log.Verbose("Com client {ConnectionToken} error count: {ErrorCount}", ConnectionToken, _errorCount);
         }
 
-        #region 发送接收数据
-
         /// <inheritdoc />
         public override bool IsConnected
         {
@@ -324,7 +338,7 @@ namespace Modbus.Net
                             Parity = _parity,
                             StopBits = _stopBits,
                             DataBits = _dataBits,
-                            ReadTimeout = _timeoutTime
+                            ReadTimeout = TimeoutTime
                         });
                     }
                     if (!Linkers.ContainsKey(_slave))
@@ -379,16 +393,18 @@ namespace Modbus.Net
             return false;
         }
 
+        #region 发送接收数据
+
         /// <summary>
         ///     带返回发送数据
         /// </summary>
         /// <param name="sendStr">需要发送的数据</param>
         /// <returns>是否发送成功</returns>
-        public string SendMsg(string sendStr)
+        public async Task<string> SendMsgAsync(string sendStr)
         {
             var myByte = sendStr.StringToByte_2();
 
-            var returnBytes = SendMsg(myByte);
+            var returnBytes = await SendMsgAsync(myByte);
 
             return returnBytes.ByteToString();
         }
@@ -421,40 +437,11 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
-        ///     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>
-        protected byte[] SendMsg(byte[] message)
-        {
-            return AsyncHelper.RunSync(() => SendMsgAsync(message));
-        }
-
         /// <inheritdoc />
         public override async Task<byte[]> SendMsgAsync(byte[] message)
         {
             CheckOpen();
-            var task = SendMsgInner(message).WithCancellation(new CancellationTokenSource(100000).Token);
-            var ans = await task;
-            if (task.IsCanceled)
-            {
-                Controller.ForceRemoveWaitingMessage(ans);
-                return null;
-            }
-            return ans.ReceiveMessage;
-        }
-
-        private async Task<MessageWaitingDef> SendMsgInner(byte[] message)
-        {
-            using (await SerialPort.Lock.LockAsync())
-            {
-                var messageSendingdef = Controller.AddMessage(message);
-                messageSendingdef.SendMutex.WaitOne();
-                await SendMsgWithoutConfirm(message);
-                messageSendingdef.ReceiveMutex.WaitOne();
-                return messageSendingdef;
-            }
+            return await base.SendMsgAsync(message);
         }
 
         /// <inheritdoc />
diff --git a/Modbus.Net/Modbus.Net/FifoController.cs b/Modbus.Net/Modbus.Net/FifoController.cs
index bb4c99d..0b8267b 100644
--- a/Modbus.Net/Modbus.Net/FifoController.cs
+++ b/Modbus.Net/Modbus.Net/FifoController.cs
@@ -44,19 +44,17 @@ namespace Modbus.Net
                     }
                     lock (WaitingMessages)
                     {
-                        if (_currentSendingPos == null)
-                        {
-                            if (WaitingMessages.Count > 0)
-                            {
-                                _currentSendingPos = WaitingMessages.First();
-                            }
-                        }
                         if (_currentSendingPos != null)
                         {
-                            _currentSendingPos.SendMutex.Set();
-                            _currentSendingPos = WaitingMessages.Count <= 1
-                                ? null
-                                : WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
+                            if (WaitingMessages.Count <= 0)
+                            {
+                                _currentSendingPos = null;
+                            }
+                            if (WaitingMessages.Count > WaitingMessages.IndexOf(_currentSendingPos) + 1)
+                            {
+                                _currentSendingPos = WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
+                                _currentSendingPos.SendMutex.Set();
+                            }
                         }
                     }
                 }
diff --git a/Modbus.Net/Modbus.Net/IConnector.cs b/Modbus.Net/Modbus.Net/IConnector.cs
index 121ec4b..d570a3a 100644
--- a/Modbus.Net/Modbus.Net/IConnector.cs
+++ b/Modbus.Net/Modbus.Net/IConnector.cs
@@ -5,7 +5,7 @@ namespace Modbus.Net
     /// <summary>
     ///     ������Э�����ӽӿ�
     /// </summary>
-    public interface IConnector<TParamIn, TParamOut>
+    public interface IConnector<in TParamIn, TParamOut>
     {
         /// <summary>
         ///     ��ʶConnector�����ӹؼ���
diff --git a/Modbus.Net/Modbus.Net/MatchController.cs b/Modbus.Net/Modbus.Net/MatchController.cs
index 8fed36a..a4f00f5 100644
--- a/Modbus.Net/Modbus.Net/MatchController.cs
+++ b/Modbus.Net/Modbus.Net/MatchController.cs
@@ -56,14 +56,20 @@ namespace Modbus.Net
                             if (WaitingMessages.Count > 0)
                             {
                                 _currentSendingPos = WaitingMessages.First();
+                                _currentSendingPos.SendMutex.Set();                                
                             }
                         }
                         if (_currentSendingPos != null)
                         {
-                            _currentSendingPos.SendMutex.Set();
-                            _currentSendingPos = WaitingMessages.Count <= 1
-                                ? null
-                                : WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
+                            if (WaitingMessages.Count <= 0)
+                            {
+                                _currentSendingPos = null;
+                            }
+                            if (WaitingMessages.Count > WaitingMessages.IndexOf(_currentSendingPos) + 1)
+                            {
+                                _currentSendingPos = WaitingMessages[WaitingMessages.IndexOf(_currentSendingPos) + 1];
+                                _currentSendingPos.SendMutex.Set();
+                            }
                         }
                     }
                 }
diff --git a/Modbus.Net/Modbus.Net/TcpConnector.cs b/Modbus.Net/Modbus.Net/TcpConnector.cs
index b55234a..bdcbe9b 100644
--- a/Modbus.Net/Modbus.Net/TcpConnector.cs
+++ b/Modbus.Net/Modbus.Net/TcpConnector.cs
@@ -3,6 +3,7 @@ using System.Linq;
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
+using Nito.AsyncEx;
 using Serilog;
 
 namespace Modbus.Net
@@ -61,22 +62,17 @@ namespace Modbus.Net
         /// <param name="ipaddress">Ip地址</param>
         /// <param name="port">端口</param>
         /// <param name="timeoutTime">超时时间</param>
-        public TcpConnector(string ipaddress, int port, int timeoutTime)
+        public TcpConnector(string ipaddress, int port, int timeoutTime = 10000) : base(timeoutTime)
         {
             _host = ipaddress;
             _port = port;
-            TimeoutTime = timeoutTime;
         }
 
-        /// <summary>
-        ///     连接关键字
-        /// </summary>
+        /// <inheritdoc />
         public override string ConnectionToken => _host;
 
-        /// <summary>
-        ///     超时时间
-        /// </summary>
-        public int TimeoutTime
+        /// <inheritdoc />
+        protected override int TimeoutTime
         {
             get  =>
             _timeoutTime;
@@ -88,14 +84,13 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
-        ///     是否已经连接
-        /// </summary>
+        /// <inheritdoc />
         public override bool IsConnected => _socketClient?.Client != null && _socketClient.Connected;
 
-        /// <summary>
-        ///     实现IDisposable接口
-        /// </summary>
+        /// <inheritdoc />
+        protected override AsyncLock Lock { get; } = new AsyncLock();
+
+        /// <inheritdoc />
         public void Dispose()
         {
             Dispose(true);
@@ -141,10 +136,7 @@ namespace Modbus.Net
             Dispose(false);
         }
 
-        /// <summary>
-        ///     连接
-        /// </summary>
-        /// <returns>是否连接成功</returns>
+        /// <inheritdoc />
         public override async Task<bool> ConnectAsync()
         {
             if (_socketClient != null)
@@ -184,10 +176,7 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
-        ///     断开
-        /// </summary>
-        /// <returns>是否断开成功</returns>
+        /// <inheritdoc />
         public override bool Disconnect()
         {
             if (_socketClient == null)
@@ -211,36 +200,7 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
-        ///     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)
-        {
-            var task = SendMsgInner(message).WithCancellation(new CancellationTokenSource(10000).Token);
-            var ans = await task;
-            if (task.IsCanceled)
-            {
-                Controller.ForceRemoveWaitingMessage(ans);
-                return null;
-            }
-            return ans.ReceiveMessage;
-        }
-
-        private async Task<MessageWaitingDef> SendMsgInner(byte[] message)
-        {
-            var messageSendingdef = Controller.AddMessage(message);
-            messageSendingdef.SendMutex.WaitOne();
-            await SendMsgWithoutConfirm(message);
-            messageSendingdef.ReceiveMutex.WaitOne();
-            return messageSendingdef;
-        }
-
-        /// <summary>
-        ///     发送信息，不进行返回确认
-        /// </summary>
-        /// <param name="message">发送的信息</param>
+        /// <inheritdoc />
         protected override async Task SendMsgWithoutConfirm(byte[] message)
         {
             var datagram = message;
@@ -265,17 +225,13 @@ namespace Modbus.Net
             }
         }
 
-        /// <summary>
-        ///     启动获取线程
-        /// </summary>
+        /// <inheritdoc />
         protected override void ReceiveMsgThreadStart()
         {
             _receiveThread = Task.Run(ReceiveMessage);
         }
 
-        /// <summary>
-        ///     停止获取线程
-        /// </summary>
+        /// <inheritdoc />
         protected override void ReceiveMsgThreadStop()
         {
             _taskCancel = true;