diff --git a/mainwindow.ui b/mainwindow.ui
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -128,6 +128,9 @@
                  <property name="text">
                   <string>No Parity</string>
                  </property>
+                 <property name="checked">
+                  <bool>true</bool>
+                 </property>
                 </widget>
                </item>
                <item>
@@ -168,6 +171,9 @@
                  <property name="text">
                   <string>8 bits</string>
                  </property>
+                 <property name="checked">
+                  <bool>true</bool>
+                 </property>
                 </widget>
                </item>
                <item>
@@ -202,6 +208,9 @@
                  <property name="text">
                   <string>1 Stop Bit</string>
                  </property>
+                 <property name="checked">
+                  <bool>true</bool>
+                 </property>
                 </widget>
                </item>
                <item>
@@ -235,6 +244,9 @@
                  <property name="text">
                   <string>No Flow Control</string>
                  </property>
+                 <property name="checked">
+                  <bool>true</bool>
+                 </property>
                 </widget>
                </item>
                <item>