diff --git a/mainwindow.cpp b/mainwindow.cpp
index e74c5b6..e1cda89 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -20,6 +20,7 @@ QTimer               *timer0;
 QTimer               *timer1;
 QTimer               *timer2;
 QTimer               *timer3;
+QTimer               *checkConnectTimer0;
 #define TAG "MainWindow"
 
 static const char *fmt(const char *fmt, ...) {
@@ -245,6 +246,19 @@ void MainWindow::refreshReadonlyPage2() {
     UPDATE(4);
   }
 }
+
+bool MainWindow::checkConnected() {
+  if (!G_QTDataChannel.isOpen()) {
+    return false;
+  }
+  uint32_t         val;
+  zaf_error_code_t ecode = m_clstc->reg_read(kreg_software_version, val);
+  if (ecode != kaf_ec_success) {
+    return false;
+  }
+  return true;
+}
+
 void MainWindow::refreshReadonlyPage3() {
   if (!G_QTDataChannel.isOpen()) {
     return;
@@ -632,6 +646,8 @@ void MainWindow::constructUI() {
   ui->ShutterX_InSigSelect_2->addItems(LightSrcX_TriSrc_QStringList);
   ui->ShutterX_InSigSelect_3->addItems(LightSrcX_TriSrc_QStringList);
   ui->ShutterX_InSigSelect_4->addItems(LightSrcX_TriSrc_QStringList);
+
+  ui->InterClk_TriOutSignalFreq_Text->setDisabled(true);
 }
 
 MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) {
@@ -654,22 +670,45 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
   constructUI();
 
   // 创建定时器
-  timer0 = new QTimer(this);
-  timer1 = new QTimer(this);
-  timer2 = new QTimer(this);
-  timer3 = new QTimer(this);
+  timer0             = new QTimer(this);
+  timer1             = new QTimer(this);
+  timer2             = new QTimer(this);
+  timer3             = new QTimer(this);
+  checkConnectTimer0 = new QTimer(this);
   connect(timer0, &QTimer::timeout, this, [this]() { refreshReadonlyPage0(); });
   connect(timer1, &QTimer::timeout, this, [this]() { refreshReadonlyPage1(); });
   connect(timer2, &QTimer::timeout, this, [this]() { refreshReadonlyPage2(); });
   connect(timer3, &QTimer::timeout, this, [this]() { refreshReadonlyPage3(); });
+  connect(checkConnectTimer0, &QTimer::timeout, this, [this]() {  //
+    static bool connected = false;
+    bool        connect   = checkConnected();
+    if (connect) {
+      ui->DeviceConnectStateTB->setText("已连接");
+      ui->DeviceConnectStateTB->setStyleSheet("color: green");
+
+    } else {
+      ui->DeviceConnectStateTB->setText("未连接");
+      ui->DeviceConnectStateTB->setStyleSheet("color: red");
+    }
+    if (connected != connect) {
+      connected = connect;
+      if (connected) {
+        refreshPage();
+      }
+    }
+
+  });
+
   timer0->setInterval(1100);  // 每隔一秒触发一次
   timer1->setInterval(1200);  // 每隔一秒触发一次
   timer2->setInterval(900);   // 每隔一秒触发一次
   timer3->setInterval(1000);  // 每隔一秒触发一次
+  checkConnectTimer0->setInterval(100);
   timer0->start();
   timer1->start();
   timer2->start();
   timer3->start();
+  checkConnectTimer0->start();
 
   // m_clstc->regRawDataListener([this](uart_message_type_t type, uint8_t *data, size_t len) {
   //   QString text;
diff --git a/mainwindow.h b/mainwindow.h
index 4b25a9a..ca97eac 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -81,6 +81,7 @@ class MainWindow : public QMainWindow {
   void refreshReadonlyPage2();
   void refreshReadonlyPage3();
 
+  bool checkConnected();
 
  private slots:
   /**
@@ -90,14 +91,9 @@ class MainWindow : public QMainWindow {
  signals:
   void doinui_signal(QFunction);
 
-
-
  private:
   static void log_output(QtMsgType type, const QMessageLogContext &context, const QString &msg);
   void        constructUI();
   void        dumpLog(const char *fmt, ...);
 };
 #endif  // MAINWINDOW_H
-
-
-
diff --git a/mainwindow.ui b/mainwindow.ui
index bc394a7..8795d24 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -449,7 +449,7 @@
              </sizepolicy>
             </property>
             <property name="currentIndex">
-             <number>3</number>
+             <number>0</number>
             </property>
             <property name="tabBarAutoHide">
              <bool>true</bool>