diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index 6e0fcc8..66eb68c 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -139,6 +139,11 @@ void ATBDeviceControllerPlugin::startPhysicalLayer()
         return;
     }
 
+    qCritical() << "ATBDeviceControllerPlugin::startPhysicalLayer() " << endl
+                << "     -> use master lib " << endl
+                << "     -> start physical layer";
+
+
     // open serial port
     hw->dc_openSerial(5, "115200", this->serialPortName, 1);
 
@@ -1318,6 +1323,10 @@ bool ATBDeviceControllerPlugin::private_loadCashAgentLib(QString pluginName)
 
     qCritical() << "ATBDeviceControllerPlugin: loaded CashAgentLib";
 
+    if (this->isMaster) {
+        QTimer::singleShot(500, this, &ATBDeviceControllerPlugin::startPhysicalLayer);
+    }
+
     return true;
 }