diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index 4819a51..c2f90fb 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -450,6 +450,12 @@ void ATBDeviceControllerPlugin::onVaultDoorOpened()
     this->dbus->startBackgroundTask("DOOR_OPEN");
 
     emit this->requestModeACCOUNT();
+
+    // send service message, delayed:
+    QTimer::singleShot(1000, this, [this](){
+        emit this->showServiceText(nsDeviceControllerInterface::SERVICE_TEXT::VAULT_DOOR_OPENED, "Please remove coinbox");
+        hw->prn_cut(3);
+    } );
 }
 
 void ATBDeviceControllerPlugin::onCoinBoxRemoved()
@@ -459,12 +465,17 @@ void ATBDeviceControllerPlugin::onCoinBoxRemoved()
     // BackgroundTask("ACCOUNT") is finished, if account message is sent to ISMAS!
     this->dbus->startBackgroundTask("ACCOUNT");
 
+    emit this->showServiceText(nsDeviceControllerInterface::SERVICE_TEXT::COIN_BOX_REMOVED, "Please insert coinbox");
+
     QTimer::singleShot(4000, this, SLOT(private_startAccount()));
 }
 
 void ATBDeviceControllerPlugin::onCoinBoxInserted()
 {
     qCritical() << "ATBDeviceControllerPlugin::onCoinBoxInserted()";
+
+    emit this->showServiceText(nsDeviceControllerInterface::SERVICE_TEXT::COIN_BOX_INSERTED, "Please close vault door");
+    // emit this->showServiceText(0x1234);
 }
 
 /**
diff --git a/src/ATBAPP/DeviceControllerInterface.h b/src/ATBAPP/DeviceControllerInterface.h
index 249e1b3..4026051 100644
--- a/src/ATBAPP/DeviceControllerInterface.h
+++ b/src/ATBAPP/DeviceControllerInterface.h
@@ -15,6 +15,9 @@ namespace nsDeviceControllerInterface {
     enum class TICKET_VARIANT : quint8;
     enum class COIN_PROCESSOR : quint8;
     enum class BILL_ACCEPTOR  : quint8;
+
+
+    enum class SERVICE_TEXT  : quint16;
 }
 
 
@@ -170,8 +173,7 @@ signals:
     /**
      * show text messages in service mode
      */
-    void showServiceText(const QString & text);
-    void showServiceText(quint16 textNumber);
+    void showServiceText(nsDeviceControllerInterface::SERVICE_TEXT serviceText, const QString & text);
 
 
     /**
@@ -191,7 +193,7 @@ signals:
 
 
 Q_DECLARE_INTERFACE(DeviceControllerInterface,
-                    "eu.atb.ptu.plugin.DeviceControllerInterface/1.1.0")
+                    "eu.atb.ptu.plugin.DeviceControllerInterface/1.1.1")
 
 
 namespace nsDeviceControllerInterface {
@@ -235,6 +237,14 @@ namespace nsDeviceControllerInterface {
         YES,
         NO
     };
+
+    enum class SERVICE_TEXT  : quint16 {
+        SERVICE_DOOR_OPENED,
+        VAULT_DOOR_OPENED,
+        COIN_BOX_REMOVED,
+        COIN_BOX_INSERTED
+        /* t.b.d. */
+    };
 }
 
 #endif // DEVICECONTROLLERINTERFACE_H