diff --git a/Modbus.Net/Modbus.Net.Siemens/SiemensPpiProtocolLinker.cs b/Modbus.Net/Modbus.Net.Siemens/SiemensPpiProtocolLinker.cs
index d0f44f9..46e922e 100644
--- a/Modbus.Net/Modbus.Net.Siemens/SiemensPpiProtocolLinker.cs
+++ b/Modbus.Net/Modbus.Net.Siemens/SiemensPpiProtocolLinker.cs
@@ -1,7 +1,8 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
+using System.IO.Ports;
 using System.Threading;
 using System.Threading.Tasks;
-using System.IO.Ports;
 
 namespace Modbus.Net.Siemens
 {
@@ -16,7 +17,11 @@ namespace Modbus.Net.Siemens
         /// <param name="com">串口地址</param>
         /// <param name="slaveAddress">从站号</param>
         public SiemensPpiProtocolLinker(string com, int slaveAddress)
-            : base(com, slaveAddress, parity:Parity.Even)
+            : base(com, slaveAddress, parity: 
+                  ConfigurationReader.GetValue("COM:Siemens", "Parity") != null 
+                  ? Enum.Parse<Parity>(ConfigurationReader.GetValue("COM:Siemens", "Parity")) 
+                  : null
+                  )
         {
             ((IConnectorWithController<byte[], byte[]>)BaseConnector).AddController(new FifoController(
                 int.Parse(ConfigurationReader.GetValue("COM:" + com + ":" + slaveAddress, "FetchSleepTime")),
diff --git a/Modbus.Net/Modbus.Net/appsettings.default.json b/Modbus.Net/Modbus.Net/appsettings.default.json
index 4676716..f72eb6b 100644
--- a/Modbus.Net/Modbus.Net/appsettings.default.json
+++ b/Modbus.Net/Modbus.Net/appsettings.default.json
@@ -35,7 +35,8 @@
         "COM": "COM1"
       },
       "Siemens": {
-        "COM": "COM2"
+        "COM": "COM2",
+        "Parity": "Even"
       }
     },
     "Controller": {
diff --git a/Samples/AnyType/appsettings.default.json b/Samples/AnyType/appsettings.default.json
index 4676716..f72eb6b 100644
--- a/Samples/AnyType/appsettings.default.json
+++ b/Samples/AnyType/appsettings.default.json
@@ -35,7 +35,8 @@
         "COM": "COM1"
       },
       "Siemens": {
-        "COM": "COM2"
+        "COM": "COM2",
+        "Parity": "Even"
       }
     },
     "Controller": {
diff --git a/Samples/CrossLamp/appsettings.default.json b/Samples/CrossLamp/appsettings.default.json
index 4676716..f72eb6b 100644
--- a/Samples/CrossLamp/appsettings.default.json
+++ b/Samples/CrossLamp/appsettings.default.json
@@ -35,7 +35,8 @@
         "COM": "COM1"
       },
       "Siemens": {
-        "COM": "COM2"
+        "COM": "COM2",
+        "Parity": "Even"
       }
     },
     "Controller": {
diff --git a/Samples/MachineJob/appsettings.default.json b/Samples/MachineJob/appsettings.default.json
index 4676716..f72eb6b 100644
--- a/Samples/MachineJob/appsettings.default.json
+++ b/Samples/MachineJob/appsettings.default.json
@@ -35,7 +35,8 @@
         "COM": "COM1"
       },
       "Siemens": {
-        "COM": "COM2"
+        "COM": "COM2",
+        "Parity": "Even"
       }
     },
     "Controller": {
diff --git a/Samples/TripleAdd/appsettings.default.json b/Samples/TripleAdd/appsettings.default.json
index 4676716..f72eb6b 100644
--- a/Samples/TripleAdd/appsettings.default.json
+++ b/Samples/TripleAdd/appsettings.default.json
@@ -35,7 +35,8 @@
         "COM": "COM1"
       },
       "Siemens": {
-        "COM": "COM2"
+        "COM": "COM2",
+        "Parity": "Even"
       }
     },
     "Controller": {
diff --git a/Tests/Modbus.Net.Tests/appsettings.default.json b/Tests/Modbus.Net.Tests/appsettings.default.json
index 4676716..f72eb6b 100644
--- a/Tests/Modbus.Net.Tests/appsettings.default.json
+++ b/Tests/Modbus.Net.Tests/appsettings.default.json
@@ -35,7 +35,8 @@
         "COM": "COM1"
       },
       "Siemens": {
-        "COM": "COM2"
+        "COM": "COM2",
+        "Parity": "Even"
       }
     },
     "Controller": {