diff --git a/Modbus.Net/Modbus.Net.OPC/FBox/FBoxOpcDaManchine.cs b/Modbus.Net/Modbus.Net.OPC/FBox/FBoxOpcDaManchine.cs
index 997c627..c1f4827 100644
--- a/Modbus.Net/Modbus.Net.OPC/FBox/FBoxOpcDaManchine.cs
+++ b/Modbus.Net/Modbus.Net.OPC/FBox/FBoxOpcDaManchine.cs
@@ -17,7 +17,9 @@ namespace Modbus.Net.OPC.FBox
         /// <param name="keepConnect">是否保持连接</param>
         public FBoxOpcDaMachine(string localSequence, string linkerName,
             IEnumerable<AddressUnit> getAddresses, bool keepConnect)
-            : base(ConfigurationManager.AppSettings["FBoxOpcDaHost"], getAddresses, keepConnect)
+            : base(
+                ConfigurationManager.AppSettings["FBoxOpcDaHost"] ?? "opcda://localhost/FBoxOpcServer", getAddresses,
+                keepConnect)
         {
             LocalSequence = localSequence;
             LinkerName = linkerName;
diff --git a/Modbus.Net/Modbus.Net/ComConnector.cs b/Modbus.Net/Modbus.Net/ComConnector.cs
index 71ab2d2..0c5b417 100644
--- a/Modbus.Net/Modbus.Net/ComConnector.cs
+++ b/Modbus.Net/Modbus.Net/ComConnector.cs
@@ -312,19 +312,19 @@ namespace Modbus.Net
         private void RefreshSendCount()
         {
             _sendCount++;
-            Log.Verbose("Tcp client {ConnectionToken} send count: {SendCount}", ConnectionToken, _sendCount);
+            Log.Verbose("Com client {ConnectionToken} send count: {SendCount}", ConnectionToken, _sendCount);
         }
 
         private void RefreshReceiveCount()
         {
             _receiveCount++;
-            Log.Verbose("Tcp client {ConnectionToken} receive count: {SendCount}", ConnectionToken, _receiveCount);
+            Log.Verbose("Com client {ConnectionToken} receive count: {SendCount}", ConnectionToken, _receiveCount);
         }
 
         private void RefreshErrorCount()
         {
             _errorCount++;
-            Log.Verbose("Tcp client {ConnectionToken} error count: {ErrorCount}", ConnectionToken, _errorCount);
+            Log.Verbose("Com client {ConnectionToken} error count: {ErrorCount}", ConnectionToken, _errorCount);
         }
 
         #region 发送接收数据
@@ -458,7 +458,8 @@ namespace Modbus.Net
                     {
                         Log.Verbose("Com client {ConnectionToken} send msg length: {Length}", ConnectionToken,
                             sendbytes.Length);
-                        Log.Verbose("Com client {ConnectionToken} send msg: {SendBytes}", ConnectionToken, sendbytes);
+                        Log.Verbose(
+                            $"Com client {ConnectionToken} send msg: {String.Concat(sendbytes.Select(p => " " + p))}");
                         SerialPort.Write(sendbytes, 0, sendbytes.Length);
                     }
                     catch (Exception err)
@@ -473,8 +474,8 @@ namespace Modbus.Net
                         returnBytes = ReadMsg();
                         Log.Verbose("Com client {ConnectionToken} receive msg length: {Length}", ConnectionToken,
                             returnBytes.Length);
-                        Log.Verbose("Com client {ConnectionToken} receive msg: {SendBytes}", ConnectionToken,
-                            returnBytes);
+                        Log.Verbose(
+                            $"Com client {ConnectionToken} receive msg: {String.Concat(returnBytes.Select(p => " " + p))}");
                     }
                     catch (Exception e)
                     {
@@ -529,7 +530,8 @@ namespace Modbus.Net
                     {
                         Log.Verbose("Com client {ConnectionToken} send msg length: {Length}", ConnectionToken,
                             sendbytes.Length);
-                        Log.Verbose("Com client {ConnectionToken} send msg: {SendBytes}", ConnectionToken, sendbytes);
+                        Log.Verbose(
+                            $"Com client {ConnectionToken} send msg: {string.Concat(sendbytes.Select(p => " " + p))}");
                         SerialPort.Write(sendbytes, 0, sendbytes.Length);
                     }
                     catch (Exception err)
diff --git a/Modbus.Net/src/Base.Common/TcpConnector.cs b/Modbus.Net/src/Base.Common/TcpConnector.cs
index 2e71893..a73c96f 100644
--- a/Modbus.Net/src/Base.Common/TcpConnector.cs
+++ b/Modbus.Net/src/Base.Common/TcpConnector.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
@@ -240,7 +241,7 @@ namespace Modbus.Net
                 var stream = _socketClient.GetStream();
 
                 Log.Verbose("Tcp client {ConnectionToken} send text len = {Length}", ConnectionToken, datagram.Length);
-                Log.Verbose("Tcp client {ConnectionToken} send text = {Datagram}", ConnectionToken, datagram);
+                Log.Verbose($"Tcp client {ConnectionToken} send text = {String.Concat(datagram.Select(p => " " + p))}");
                 await stream.WriteAsync(datagram, 0, datagram.Length);
 
                 RefreshSendCount();
@@ -281,16 +282,18 @@ namespace Modbus.Net
 
                 var stream = _socketClient.GetStream();
 
-                Log.Verbose("Tcp client {ConnectionToken} send text len = {Length}", ConnectionToken, datagram.Length);
-                Log.Verbose("Tcp client {ConnectionToken} send: {Datagram}", ConnectionToken, datagram);
-                await stream.WriteAsync(datagram, 0, datagram.Length);
-
                 RefreshSendCount();
 
+                Log.Verbose("Tcp client {ConnectionToken} send text len = {Length}", ConnectionToken, datagram.Length);
+                Log.Verbose($"Tcp client {ConnectionToken} send: {String.Concat(datagram.Select(p => " " + p))}");
+                await stream.WriteAsync(datagram, 0, datagram.Length);
+
                 var receiveBytes = await ReceiveAsync(stream);
                 Log.Verbose("Tcp client {ConnectionToken} receive text len = {Length}", ConnectionToken,
                     receiveBytes.Length);
-                Log.Verbose("Tcp client {ConnectionToken} receive: {Datagram}", ConnectionToken, receiveBytes);
+                Log.Verbose($"Tcp client {ConnectionToken} receive: {String.Concat(receiveBytes.Select(p => " " + p))}");
+
+                RefreshReceiveCount();
 
                 return receiveBytes;
             }
@@ -335,9 +338,6 @@ namespace Modbus.Net
             var replyMessage = new byte[len];
             Array.Copy(_receiveBuffer, replyMessage, len);
 
-            Log.Verbose("Tcp client {ConnectionToken} reply: {replyMessage}", ConnectionToken, replyMessage);
-            RefreshReceiveCount();
-
             if (len <= 0)
                 RefreshErrorCount();
 
diff --git a/Tests/Modbus.Net.Tests/App.config b/Tests/Modbus.Net.Tests/App.config
deleted file mode 100644
index 7802c78..0000000
--- a/Tests/Modbus.Net.Tests/App.config
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <appSettings>
-    <add key="FBoxOpcDaHost" value="opcda://localhost/FBoxOpcServer" />
-  </appSettings>
-</configuration>
\ No newline at end of file
diff --git a/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj b/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj
index 2942bdd..82f82f2 100644
--- a/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj
+++ b/Tests/Modbus.Net.Tests/Modbus.Net.Tests.csproj
@@ -79,9 +79,6 @@
       <Name>Modbus.Net</Name>
     </ProjectReference>
   </ItemGroup>
-  <ItemGroup>
-    <None Include="App.config" />
-  </ItemGroup>
   <Choose>
     <When Condition="'$(VisualStudioVersion)' == '10.0' And '$(IsCodedUITest)' == 'True'">
       <ItemGroup>