diff --git a/S7.Net.UnitTest/ConnectionRequestTest.cs b/S7.Net.UnitTest/ConnectionRequestTest.cs
new file mode 100644
index 0000000..4615c3a
--- /dev/null
+++ b/S7.Net.UnitTest/ConnectionRequestTest.cs
@@ -0,0 +1,82 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using S7.Net.Protocol;
+
+namespace S7.Net.UnitTest
+{
+    [TestClass]
+    public class ConnectionRequestTest
+    {
+        [TestMethod]
+        public void Test_ConnectionRequest_S7_200()
+        {
+            CollectionAssert.AreEqual(MakeConnectionRequest(16, 0, 16, 0),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7200, 0, 0));
+        }
+
+        [TestMethod]
+        public void Test_ConnectionRequest_S7_300()
+        {
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 0),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7300, 0, 0));
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 1),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7300, 0, 1));
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 33),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7300, 1, 1));
+        }
+
+        [TestMethod]
+        public void Test_ConnectionRequest_S7_400()
+        {
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 0),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7400, 0, 0));
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 1),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7400, 0, 1));
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 33),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S7400, 1, 1));
+        }
+
+        [TestMethod]
+        public void Test_ConnectionRequest_S7_1200()
+        {
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 0),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S71200, 0, 0));
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 1),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S71200, 0, 1));
+            CollectionAssert.AreEqual(MakeConnectionRequest(1, 0, 3, 33),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S71200, 1, 1));
+        }
+
+        [TestMethod]
+        public void Test_ConnectionRequest_S7_1500()
+        {
+            CollectionAssert.AreEqual(MakeConnectionRequest(0x10, 0x2, 3, 0),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S71500, 0, 0));
+            CollectionAssert.AreEqual(MakeConnectionRequest(0x10, 0x2, 3, 1),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S71500, 0, 1));
+            CollectionAssert.AreEqual(MakeConnectionRequest(0x10, 0x2, 3, 33),
+                ConnectionRequest.GetCOTPConnectionRequest(CpuType.S71500, 1, 1));
+        }
+
+        private static byte[] MakeConnectionRequest(byte sourceTsap1, byte sourceTsap2, byte destTsap1, byte destTsap2)
+        {
+            return new byte[]
+            {
+                3, 0, 0, 22, //TPKT
+                17, //COTP Header Length
+                224, //Connect Request 
+                0, 0, //Destination Reference
+                0, 46, //Source Reference
+                0, //Flags
+                193, //Parameter Code (src-tasp)
+                2, //Parameter Length
+                sourceTsap1, sourceTsap2, //Source TASP
+                194, //Parameter Code (dst-tasp)
+                2, //Parameter Length
+                destTsap1, destTsap2, //Destination TASP
+                192, //Parameter Code (tpdu-size)
+                1, //Parameter Length
+                9 //TPDU Size (2^9 = 512)
+            };
+        }
+    }
+}
diff --git a/S7.Net.UnitTest/S7.Net.UnitTest.csproj b/S7.Net.UnitTest/S7.Net.UnitTest.csproj
index 1ead757..bfaa48e 100644
--- a/S7.Net.UnitTest/S7.Net.UnitTest.csproj
+++ b/S7.Net.UnitTest/S7.Net.UnitTest.csproj
@@ -60,6 +60,7 @@
     <Otherwise />
   </Choose>
   <ItemGroup>
+    <Compile Include="ConnectionRequestTest.cs" />
     <Compile Include="ConvertersUnitTest.cs" />
     <Compile Include="ProtocolTests.cs" />
     <Compile Include="Helpers\ConsoleManager.cs" />
@@ -119,4 +120,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>
\ No newline at end of file