diff --git a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.cs b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.cs
index 1eacb3c21..c78629850 100644
--- a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.cs	
+++ b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.cs	
@@ -92,12 +92,6 @@ private void BrowseToAscom(object sender, EventArgs e)
 
         #region Properties for Settings
 
-        public short InterfaceVersion
-        {
-            get { return (short)NumInterfaceVersion.Value; }
-            set { NumInterfaceVersion.Value = value; }
-        }
-
         public int EquatorialSystem
         {
             get { return int.Parse(comboBoxEquatorialSystem.SelectedValue.ToString(), CultureInfo.CurrentCulture); }
diff --git a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.designer.cs b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.designer.cs
index d209ba631..fd9ee6cdb 100644
--- a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.designer.cs	
+++ b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/SetupDialogForm.designer.cs	
@@ -104,8 +104,6 @@ private void InitializeComponent()
             this.checkBoxRefraction = new System.Windows.Forms.CheckBox();
             this.labelVersion = new System.Windows.Forms.Label();
             this.labelTime = new System.Windows.Forms.Label();
-            this.NumInterfaceVersion = new System.Windows.Forms.NumericUpDown();
-            this.label10 = new System.Windows.Forms.Label();
             this.groupBox1.SuspendLayout();
             this.tableLayoutPanel1.SuspendLayout();
             ((System.ComponentModel.ISupportInitialize)(this.picASCOM)).BeginInit();
@@ -118,7 +116,6 @@ private void InitializeComponent()
             this.tableLayoutPanel4.SuspendLayout();
             this.tableLayoutPanel5.SuspendLayout();
             this.tableLayoutPanel6.SuspendLayout();
-            ((System.ComponentModel.ISupportInitialize)(this.NumInterfaceVersion)).BeginInit();
             this.SuspendLayout();
             // 
             // cmdOK
@@ -1007,46 +1004,12 @@ private void InitializeComponent()
             this.labelTime.TabIndex = 19;
             this.labelTime.Text = "<run time - time zone and UTC offset>";
             // 
-            // NumInterfaceVersion
-            // 
-            this.NumInterfaceVersion.Location = new System.Drawing.Point(388, 148);
-            this.NumInterfaceVersion.Maximum = new decimal(new int[] {
-            4,
-            0,
-            0,
-            0});
-            this.NumInterfaceVersion.Minimum = new decimal(new int[] {
-            3,
-            0,
-            0,
-            0});
-            this.NumInterfaceVersion.Name = "NumInterfaceVersion";
-            this.NumInterfaceVersion.Size = new System.Drawing.Size(40, 20);
-            this.NumInterfaceVersion.TabIndex = 20;
-            this.NumInterfaceVersion.Value = new decimal(new int[] {
-            3,
-            0,
-            0,
-            0});
-            // 
-            // label10
-            // 
-            this.label10.AutoSize = true;
-            this.label10.ForeColor = System.Drawing.Color.White;
-            this.label10.Location = new System.Drawing.Point(434, 151);
-            this.label10.Name = "label10";
-            this.label10.Size = new System.Drawing.Size(86, 13);
-            this.label10.TabIndex = 21;
-            this.label10.Text = "Interface version";
-            // 
             // SetupDialogForm
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.BackColor = System.Drawing.Color.Black;
             this.ClientSize = new System.Drawing.Size(628, 495);
-            this.Controls.Add(this.label10);
-            this.Controls.Add(this.NumInterfaceVersion);
             this.Controls.Add(this.labelTime);
             this.Controls.Add(this.labelVersion);
             this.Controls.Add(this.checkBoxRefraction);
@@ -1091,7 +1054,6 @@ private void InitializeComponent()
             this.tableLayoutPanel5.PerformLayout();
             this.tableLayoutPanel6.ResumeLayout(false);
             this.tableLayoutPanel6.PerformLayout();
-            ((System.ComponentModel.ISupportInitialize)(this.NumInterfaceVersion)).EndInit();
             this.ResumeLayout(false);
             this.PerformLayout();
 
@@ -1175,7 +1137,5 @@ private void InitializeComponent()
         private System.Windows.Forms.TextBox textBoxAperture;
         private System.Windows.Forms.CheckBox checkBoxNoSyncPastMeridian;
         private System.Windows.Forms.CheckBox chkCanDestinationSideofPier;
-        private System.Windows.Forms.NumericUpDown NumInterfaceVersion;
-        private System.Windows.Forms.Label label10;
     }
 }
\ No newline at end of file
diff --git a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/TelescopeHardware.cs b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/TelescopeHardware.cs
index 83aa7c7a8..7f32ec988 100644
--- a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/TelescopeHardware.cs	
+++ b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/TelescopeHardware.cs	
@@ -558,7 +558,7 @@ static TelescopeHardware()
                     s_Profile.WriteValue(SharedResources.PROGRAM_ID, "CanDestinationSideOfPier", "true", "Capabilities");
                     s_Profile.WriteValue(SharedResources.PROGRAM_ID, "CanTrackingRates", "true", "Capabilities");
                     s_Profile.WriteValue(SharedResources.PROGRAM_ID, "CanDualAxisPulseGuide", "true", "Capabilities");
-                    s_Profile.WriteValue(SharedResources.PROGRAM_ID, "InterfaceVersion", "4", "Capabilities");
+                    s_Profile.WriteValue(SharedResources.PROGRAM_ID, "InterfaceVersion", "3", "Capabilities");
                 }
 
                 //Load up the values from saved
@@ -667,7 +667,7 @@ static TelescopeHardware()
 
                 dateDelta = int.Parse(s_Profile.GetValue(SharedResources.PROGRAM_ID, "DateDelta"), CultureInfo.InvariantCulture);
 
-                interfaceVersion = short.Parse(s_Profile.GetValue(SharedResources.PROGRAM_ID, "InterfaceVersion", "", "4"), CultureInfo.InvariantCulture);
+                interfaceVersion = short.Parse(s_Profile.GetValue(SharedResources.PROGRAM_ID, "InterfaceVersion", "", "3"), CultureInfo.InvariantCulture);
 
                 if (latitude < 0) { SouthernHemisphere = true; }
 
diff --git a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/frmMain.cs b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/frmMain.cs
index bdfcd1795..d10b69093 100644
--- a/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/frmMain.cs	
+++ b/Drivers and Simulators/Telescope Simulator .NET/TelescopeSimulator/frmMain.cs	
@@ -70,7 +70,6 @@ public void DoSetupDialog()
                 setupForm.Longitude = TelescopeHardware.Longitude;
                 setupForm.MaximumSlewRate = TelescopeHardware.MaximumSlewRate;
                 setupForm.NoSyncPastMeridian = TelescopeHardware.NoSyncPastMeridian;
-                setupForm.InterfaceVersion = TelescopeHardware.InterfaceVersion;
                 this.BringToFront();
                 DialogResult ans = setupForm.ShowDialog(this);
 
@@ -120,7 +119,6 @@ public void DoSetupDialog()
                     TelescopeHardware.Longitude = setupForm.Longitude;
                     TelescopeHardware.MaximumSlewRate = setupForm.MaximumSlewRate;
                     TelescopeHardware.NoSyncPastMeridian = setupForm.NoSyncPastMeridian;
-                    TelescopeHardware.InterfaceVersion=setupForm.InterfaceVersion;
 
                     this.TopMost = setupForm.OnTop;
                 }