diff --git a/Modbus.Net/Modbus.Net/Connector/BaseConnector.cs b/Modbus.Net/Modbus.Net/Connector/BaseConnector.cs
index b6864d1..8375bd4 100644
--- a/Modbus.Net/Modbus.Net/Connector/BaseConnector.cs
+++ b/Modbus.Net/Modbus.Net/Connector/BaseConnector.cs
@@ -30,7 +30,7 @@ namespace Modbus.Net
         /// </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)
+        protected BaseConnector(int timeoutTime = 10000, bool isFullDuplex = false)
         {
             IsFullDuplex = isFullDuplex;
             if (timeoutTime < -1) timeoutTime = -1;
@@ -55,6 +55,10 @@ namespace Modbus.Net
             IDisposable asyncLock = null;
             try
             {
+                if (!Controller.IsSending)
+                {
+                    Controller.SendStart();
+                }
                 var messageSendingdef = Controller.AddMessage(message);
                 if (messageSendingdef != null)
                 {
diff --git a/Modbus.Net/Modbus.Net/Connector/EventHandlerConnector.cs b/Modbus.Net/Modbus.Net/Connector/EventHandlerConnector.cs
index 44f5395..86340e4 100644
--- a/Modbus.Net/Modbus.Net/Connector/EventHandlerConnector.cs
+++ b/Modbus.Net/Modbus.Net/Connector/EventHandlerConnector.cs
@@ -59,6 +59,10 @@ namespace Modbus.Net
             IDisposable asyncLock = null;
             try
             {
+                if (!Controller.IsSending)
+                {
+                    Controller.SendStart();
+                }
                 var messageSendingdef = Controller.AddMessage(message);
                 if (messageSendingdef != null)
                 {
diff --git a/Modbus.Net/Modbus.Net/Controller/BaseController.cs b/Modbus.Net/Modbus.Net/Controller/BaseController.cs
index a77e234..2fd0db5 100644
--- a/Modbus.Net/Modbus.Net/Controller/BaseController.cs
+++ b/Modbus.Net/Modbus.Net/Controller/BaseController.cs
@@ -21,6 +21,11 @@ namespace Modbus.Net
         /// </summary>
         protected Task SendingThread { get; set; }
 
+        /// <summary>
+        ///     ��Ϣά���߳��Ƿ�������
+        /// </summary>
+        public virtual bool IsSending => SendingThread.Status.Equals(TaskStatus.Running);
+
         /// <summary>
         ///     ���з�λ�ú���
         /// </summary>
diff --git a/Modbus.Net/Modbus.Net/Controller/MatchDirectlySendController.cs b/Modbus.Net/Modbus.Net/Controller/MatchDirectlySendController.cs
index acdc473..796333a 100644
--- a/Modbus.Net/Modbus.Net/Controller/MatchDirectlySendController.cs
+++ b/Modbus.Net/Modbus.Net/Controller/MatchDirectlySendController.cs
@@ -8,6 +8,11 @@ namespace Modbus.Net
     /// </summary>
     public class MatchDirectlySendController : MatchController
     {
+        /// <summary>
+        ///     消息维护线程是否在运行
+        /// </summary>
+        public override bool IsSending => true;
+
         /// <inheritdoc />
         public MatchDirectlySendController(ICollection<(int, int)>[] keyMatches,
             Func<byte[], int> lengthCalc = null, Func<byte[], bool?> checkRightFunc = null, int? waitingListMaxCount = null) : base(keyMatches,
diff --git a/Modbus.Net/Modbus.Net/Interface/IController.cs b/Modbus.Net/Modbus.Net/Interface/IController.cs
index 0c4306c..2cb9431 100644
--- a/Modbus.Net/Modbus.Net/Interface/IController.cs
+++ b/Modbus.Net/Modbus.Net/Interface/IController.cs
@@ -7,6 +7,11 @@ namespace Modbus.Net
     /// </summary>
     public interface IController
     {
+        /// <summary>
+        ///     ��Ϣά���߳��Ƿ�������
+        /// </summary>
+        bool IsSending { get; }
+
         /// <summary>
         ///     ������Ϣ
         /// </summary>
diff --git a/Modbus.Net/Modbus.Net/appsettings.default.json b/Modbus.Net/Modbus.Net/appsettings.default.json
index 44e92a9..4f22fec 100644
--- a/Modbus.Net/Modbus.Net/appsettings.default.json
+++ b/Modbus.Net/Modbus.Net/appsettings.default.json
@@ -3,7 +3,7 @@
     "TCP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
@@ -16,7 +16,7 @@
     "UDP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
diff --git a/Samples/AnyType/appsettings.default.json b/Samples/AnyType/appsettings.default.json
index 44e92a9..4f22fec 100644
--- a/Samples/AnyType/appsettings.default.json
+++ b/Samples/AnyType/appsettings.default.json
@@ -3,7 +3,7 @@
     "TCP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
@@ -16,7 +16,7 @@
     "UDP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
diff --git a/Samples/CrossLamp/appsettings.default.json b/Samples/CrossLamp/appsettings.default.json
index 44e92a9..4f22fec 100644
--- a/Samples/CrossLamp/appsettings.default.json
+++ b/Samples/CrossLamp/appsettings.default.json
@@ -3,7 +3,7 @@
     "TCP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
@@ -16,7 +16,7 @@
     "UDP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
diff --git a/Samples/MachineJob/appsettings.default.json b/Samples/MachineJob/appsettings.default.json
index 44e92a9..4f22fec 100644
--- a/Samples/MachineJob/appsettings.default.json
+++ b/Samples/MachineJob/appsettings.default.json
@@ -3,7 +3,7 @@
     "TCP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
@@ -16,7 +16,7 @@
     "UDP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
diff --git a/Samples/MachineJob/appsettings.json b/Samples/MachineJob/appsettings.json
index fffe11b..9762107 100644
--- a/Samples/MachineJob/appsettings.json
+++ b/Samples/MachineJob/appsettings.json
@@ -45,7 +45,7 @@
         "d:connectionString": "COM1",
         "e:addressMap": "AddressMapModbus",
         "f:keepConnect": true,
-        "g:slaveAddress": 3,
+        "g:slaveAddress": 1,
         "h:masterAddress": 2,
         "i:endian": "BigEndianLsb"
       },
diff --git a/Samples/TripleAdd/appsettings.default.json b/Samples/TripleAdd/appsettings.default.json
index 44e92a9..4f22fec 100644
--- a/Samples/TripleAdd/appsettings.default.json
+++ b/Samples/TripleAdd/appsettings.default.json
@@ -3,7 +3,7 @@
     "TCP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"
@@ -16,7 +16,7 @@
     "UDP": {
       "ConnectionTimeout": "5000",
       "FetchSleepTime": "100",
-      "FullDuplex": "False",
+      "FullDuplex": "True",
       "Modbus": {
         "ModbusPort": "502",
         "IP": "192.168.1.1"