diff --git a/src/main/java/info/istlab/IoTP/ScriptRunner.java b/src/main/java/info/istlab/IoTP/ScriptRunner.java
index 921040d..6b1ae2c 100644
--- a/src/main/java/info/istlab/IoTP/ScriptRunner.java
+++ b/src/main/java/info/istlab/IoTP/ScriptRunner.java
@@ -44,6 +44,7 @@
         // System.out.println(scriptfile);
         ArrayList<String> comlist = new ArrayList<String>();
         if (App.isWindows) {
+            SerialWindow.check();
             comlist.add("cmd");
             comlist.add("/c");
             comlist.add("start");
diff --git a/src/main/java/info/istlab/IoTP/SerialSelector.java b/src/main/java/info/istlab/IoTP/SerialSelector.java
index 5a11987..90a3176 100644
--- a/src/main/java/info/istlab/IoTP/SerialSelector.java
+++ b/src/main/java/info/istlab/IoTP/SerialSelector.java
@@ -44,6 +44,7 @@
         SerialPort selectedsp = SerialPort.getCommPort(e.getActionCommand());
         SerialWindow sw = new SerialWindow(selectedsp);
         SerialWindow.hash.put(selectedsp.getSystemPortName(), sw);    
+        App.serialName = e.getActionCommand();
 
         frame.setVisible(false);
     }
diff --git a/src/main/java/info/istlab/IoTP/SerialWindow.java b/src/main/java/info/istlab/IoTP/SerialWindow.java
index f7a49d9..b3be63b 100644
--- a/src/main/java/info/istlab/IoTP/SerialWindow.java
+++ b/src/main/java/info/istlab/IoTP/SerialWindow.java
@@ -36,6 +36,28 @@
         hash = new Hashtable<String,SerialWindow>();
     }
 
+    public static void check(){
+        SerialPort[] ports = SerialPort.getCommPorts();
+        ArrayList<SerialPort> splist_valid = new ArrayList<SerialPort>();
+        for (SerialPort sp : ports) {
+            String name = sp.getSystemPortName();
+            if (name.startsWith("cu.usbserial") || name.startsWith("COM")) {
+                splist_valid.add(sp);
+            }
+        }
+        if (splist_valid.size()==1){
+            SerialPort sp = splist_valid.get(0);
+            SerialWindow sw = new SerialWindow(sp);
+            hash.put(sp.getSystemPortName(), sw);
+            App.serialName = sp.getSystemPortName();
+        } else if (splist_valid.size()==0){
+            JOptionPane.showMessageDialog(null, "No available serial ports.");
+        } else {
+            SerialSelector.show(splist_valid.toArray(new SerialPort[]{}));
+        }
+
+    }
+
     public static void invoke() {
         SerialPort[] ports = SerialPort.getCommPorts();
         ArrayList<SerialPort> splist_valid = new ArrayList<SerialPort>();