diff --git a/driver/cli b/driver/cli
index c291f80..1b2738d 100755
Binary files a/driver/cli and b/driver/cli differ
diff --git a/driver/drv/b15f.cpp b/driver/drv/b15f.cpp
index 59dbf72..3d5de24 100644
--- a/driver/drv/b15f.cpp
+++ b/driver/drv/b15f.cpp
@@ -57,15 +57,13 @@ void B15F::init()
 void B15F::reconnect()
 {
 	uint8_t tries = RECONNECT_TRIES;		
-	while(tries-- && false)
+	while(tries--)
 	{
 		delay_ms(RECONNECT_TIMEOUT);
-		
-		discard();
+		discard();	
 		
 		if(testConnection())
 			return;
-			
 	}
 	
 	abort("Verbindung kann nicht repariert werden");
@@ -73,13 +71,20 @@ void B15F::reconnect()
 
 void B15F::discard(void)
 {
-	usart.clearOutputBuffer();
-	for(uint8_t i = 0; i < 16; i++)
+	try
 	{
-		usart.writeByte(RQ_DISC);	// sende discard Befehl (verwerfe input)
-		delay_ms(4);
+		usart.clearOutputBuffer();
+		for(uint8_t i = 0; i < 16; i++)
+		{
+			usart.writeByte(RQ_DISC);	// sende discard Befehl (verwerfe input)
+			delay_ms(4);
+		}
+		usart.clearInputBuffer();
+	}
+	catch(std::exception& ex)
+	{
+		abort(ex);
 	}
-	usart.clearInputBuffer();
 }
 
 bool B15F::testConnection()
diff --git a/driver/drv/b15f.h b/driver/drv/b15f.h
index 9cfed2d..d183644 100644
--- a/driver/drv/b15f.h
+++ b/driver/drv/b15f.h
@@ -201,20 +201,21 @@ public:
 	
 	/*************************/
 
-private:
-
-	USART usart;
-	static B15F* instance;
-	static errorhandler_t errorhandler;
-
 
 	// CONSTANTS
 	const std::string PRE = "[B15F] ";
 	constexpr static uint8_t  MSG_OK = 0xFF;
 	constexpr static uint8_t  MSG_FAIL = 0xFE;
 	constexpr static uint16_t RECONNECT_TIMEOUT = 64; // ms
+	constexpr static uint16_t WDT_TIMEOUT = 15;       // ms
 	constexpr static uint8_t  RECONNECT_TRIES = 3;
 	constexpr static uint32_t BAUDRATE = 57600;
+
+private:
+
+	USART usart;
+	static B15F* instance;
+	static errorhandler_t errorhandler;
 	
 	// REQUESTS
 	constexpr static uint8_t RQ_DISC = 0;
diff --git a/driver/ui/ui.cpp b/driver/ui/ui.cpp
index 57b5ba4..f1c1556 100644
--- a/driver/ui/ui.cpp
+++ b/driver/ui/ui.cpp
@@ -262,6 +262,10 @@ void stop_selftest(int)
 {
 	B15F& drv = B15F::getInstance();
 	drv.discard();
+	drv.delay_ms(B15F::WDT_TIMEOUT);
+	drv.reconnect();
+	drv.digitalWrite0(0);
+	drv.digitalWrite1(0);
 }
 
 void show_selftest_info(int)