diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index f95862c..f8e1447 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -60,11 +60,11 @@ PLUGIN_STATE ATBDeviceControllerPlugin::initDCPlugin(QObject *eventReceiver, con
     this->eventReceiver = eventReceiver;
 
     // read variables from setting
-    QString serialPort = settings.value("DEVICE_CONTROLLER/serialPort", "ttymxc2").toString();
+    this->serialPortName = settings.value("DEVICE_CONTROLLER/serialPort", "ttymxc2").toString();
     QByteArray printerEncoding = settings.value("DEVICE_CONTROLLER/printerEnconding", "ISO 8859-2").toString().toLatin1();
 
     // open serial port
-    hw->dc_openSerial(5, "115200", serialPort, 1);
+    hw->dc_openSerial(5, "115200", this->serialPortName, 1);
 
     hw->dc_autoRequest(true);
 
diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.h b/src/ATBAPP/ATBDeviceControllerPlugin.h
index 152265b..e8557c9 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.h
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.h
@@ -86,6 +86,7 @@ private:
 
    QList<int> templateList;
 
+   QString serialPortName;
 
    bool useDebug;