diff --git a/ClassDigitizer.cpp b/ClassDigitizer.cpp
index db6d705..dea6cbf 100644
--- a/ClassDigitizer.cpp
+++ b/ClassDigitizer.cpp
@@ -38,7 +38,8 @@ void Digitizer::Initalization(){
   
   isSettingFilledinMemeory = false;
   settingFileName = "";
-  settingFileExist = false;
+  isSettingFileExist = false;
+  isSettingFileCoupled = false;
   settingFile = NULL;
   
   ret = -1;
@@ -255,8 +256,8 @@ void Digitizer::SetRegChannelMask(uint32_t mask){
   if( !isConnected ) return;
   regChannelMask = mask;
   ret |= CAEN_DGTZ_SetChannelEnableMask(handle, regChannelMask);
-  SaveSettingToFile(DPP::RegChannelEnableMask, mask);
   SetSettingToMemory(DPP::RegChannelEnableMask, mask);
+  SaveSettingToFile(DPP::RegChannelEnableMask, mask);
   ErrorMsg(__func__);
 }
 
@@ -941,11 +942,11 @@ void Digitizer::SetSettingBinaryPath(std::string fileName){
     SaveAllSettingsAsBin(fileName);
     
     this->settingFileName = fileName;
-    settingFileExist = true;
+    isSettingFileExist = true;
   
   }else{
     this->settingFileName = fileName;
-    settingFileExist = true;
+    isSettingFileExist = true;
     fclose(settingFile);
     printf("setting file already exist. do nothing. Should program the digitizer\n");
   }
@@ -958,11 +959,11 @@ int Digitizer::LoadSettingBinaryToMemory(std::string fileName){
   
   if( settingFile == NULL ) {
     printf(" %s does not exist or cannot load.\n", fileName.c_str());
-    settingFileExist = false;
+    isSettingFileExist = false;
     return -1;
     
   }else{
-    settingFileExist = true;
+    isSettingFileExist = true;
     settingFileName = fileName;
     fclose (settingFile);
     
@@ -997,7 +998,7 @@ int Digitizer::LoadSettingBinaryToMemory(std::string fileName){
 }
     
 unsigned int Digitizer::ReadSettingFromFile(Reg registerAddress, unsigned short ch){
-  if ( !settingFileExist ) return -1;
+  if ( !isSettingFileExist ) return -1;
   
   unsigned short index = registerAddress.Index(ch);
   
@@ -1018,7 +1019,8 @@ unsigned int Digitizer::ReadSettingFromFile(Reg registerAddress, unsigned short
 
 void Digitizer::SaveSettingToFile(Reg registerAddress, unsigned int value, unsigned short ch){
 
-  if ( !settingFileExist ) return ;
+  if ( !isSettingFileExist ) return ;
+  if ( !isSettingFileCoupled ) return;
 
   unsigned short index = registerAddress.Index(ch);
   setting[index] = value;
@@ -1048,7 +1050,7 @@ void Digitizer::SaveAllSettingsAsBin(std::string fileName){
   fclose (binFile);
 
   settingFileName = fileName;
-  settingFileExist = true;
+  isSettingFileExist = true;
 
 }
 
diff --git a/ClassDigitizer.h b/ClassDigitizer.h
index b8bb43b..a16fbb1 100644
--- a/ClassDigitizer.h
+++ b/ClassDigitizer.h
@@ -53,7 +53,8 @@ class Digitizer{
     //^-------- setting 
     std::string  settingFileName;          /// 
     FILE *       settingFile;              /// 
-    bool         settingFileExist;         /// 
+    bool         isSettingFileExist;         /// 
+    bool         isSettingFileCoupled;
     bool         isSettingFilledinMemeory; /// false for disabled ReadAllSettingFromBoard()   
     unsigned int setting[SETTINGSIZE];     /// Setting, 4bytes x 2048 = 8192 bytes
     
@@ -147,8 +148,10 @@ class Digitizer{
     /// simply read settings from memory
     void           SetSettingToMemory        (Reg registerAddress, unsigned int value, unsigned short ch = 0);
     unsigned int   GetSettingFromMemory      (Reg registerAddress, unsigned short ch = 0);
-    void           PrintSettingFromMemory    ();
-    unsigned int * GetSettings()              {return setting;};    
+    unsigned int * GetSettings()             {return setting;}    
+    void           PrintSettingFromMemory();
+    void           SetSettingFileCoupled(bool onOff) {isSettingFileCoupled = onOff;}     
+    bool           IsSettingFileCoupled() const {return isSettingFileCoupled;}     
 
     /// memory <--> file
     void         SaveAllSettingsAsText       (std::string fileName);
diff --git a/DigiSettingsPanel.cpp b/DigiSettingsPanel.cpp
index 08e5fa3..7495ae2 100644
--- a/DigiSettingsPanel.cpp
+++ b/DigiSettingsPanel.cpp
@@ -216,9 +216,17 @@ DigiSettingsPanel::DigiSettingsPanel(Digitizer ** digi, unsigned int nDigi, QStr
       buttonLayout->addWidget(bnSaveSettings, rowID, 2);
       connect(bnSaveSettings, &QPushButton::clicked, this, [=](){ SaveSetting(0);});
 
-      bnSaveSettingsToText = new QPushButton("Save Settings (txt)", this);
-      buttonLayout->addWidget(bnSaveSettingsToText, rowID, 3);
-      connect(bnSaveSettingsToText, &QPushButton::clicked, this, [=](){ SaveSetting(1);});
+      // bnSaveSettingsToText = new QPushButton("Save Settings (txt)", this);
+      // buttonLayout->addWidget(bnSaveSettingsToText, rowID, 3);
+      // connect(bnSaveSettingsToText, &QPushButton::clicked, this, [=](){ SaveSetting(1);});
+
+      //checkBox, to coupled or decouple the setting file.
+      chkCoupledSettingFile = new QCheckBox("Update Bin", this);
+      buttonLayout->addWidget(chkCoupledSettingFile, rowID, 3);
+      chkCoupledSettingFile->setCheckState(Qt::CheckState::Unchecked);
+      connect(chkCoupledSettingFile, &QCheckBox::stateChanged, this, [=](){
+        digi[ID]->SetSettingFileCoupled(chkCoupledSettingFile->isChecked());
+      });
     }
 
     {//^======================= Board Settings
@@ -4020,7 +4028,7 @@ void DigiSettingsPanel::SaveSetting(int opt){
     if( opt == 0 ){
       if( ext == "") filePath += ".bin";
       digi[ID]->SaveAllSettingsAsBin(filePath.toStdString().c_str());
-      leSaveFilePath[ID]->setText(filePath + " | dynamic update");
+      leSaveFilePath[ID]->setText(filePath);
     }
     if( opt == 1 ){
       if( ext == "") filePath += ".txt";
diff --git a/DigiSettingsPanel.h b/DigiSettingsPanel.h
index 91439e3..07a0e65 100644
--- a/DigiSettingsPanel.h
+++ b/DigiSettingsPanel.h
@@ -110,7 +110,8 @@ private:
   QPushButton * bnSendSoftwareClockSyncSignal;
   QPushButton * bnSaveSettings;
   QPushButton * bnLoadSettings;
-  QPushButton * bnSaveSettingsToText;
+  //QPushButton * bnSaveSettingsToText;
+  QCheckBox   * chkCoupledSettingFile;
 
   /// ============================= Board Configure
   QGridLayout * bdCfgLayout[MaxNDigitizer];