diff --git a/Makefile b/Makefile
index 4eaeee4..d84f459 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,6 @@ CFLAGS  = -std=c++14 -O3
 LDFLAGS = 
 OBJECTS = main.o drv/b15f.o
 
-
 COMPILE = $(COMPILER_PATH) $(CFLAGS)
 
 B15F: $(OBJECTS)
diff --git a/drv/.b15f.cpp.swp b/drv/.b15f.cpp.swp
deleted file mode 100644
index f73c26c..0000000
Binary files a/drv/.b15f.cpp.swp and /dev/null differ
diff --git a/drv/b15f.cpp b/drv/b15f.cpp
index cadbe43..a6ace00 100644
--- a/drv/b15f.cpp
+++ b/drv/b15f.cpp
@@ -8,9 +8,48 @@ B15F::B15F()
 
 void B15F::init(void)
 {
-	std::cout << "moint: " << std::endl;
+	int code = system(std::string("stty 38400 -F " + SERIAL_DEVICE).c_str());
+	if(code)
+	{
+		throw DriverException("Konnte serielle Verbindung nicht initialisieren. Ist der Adapter angeschlossen?");
+	}
+	
+	usart.open(SERIAL_DEVICE.c_str());
+	
+	if(!testConnection())
+	{
+		throw DriverException("Verbindungstest fehlgeschlagen. Neueste Version im Einsatz?");
+	}
 }
 
+bool B15F::testConnection(void)
+{
+	srand (time(NULL));
+	uint8_t dummy = rand() % 256;
+	writeByte(0); // echo / dummy command for testing
+	writeByte(dummy);
+	
+	uint8_t aw = readByte();
+	uint8_t mirror = readByte();
+	
+	return aw == MSG_OK && mirror == dummy;
+}
+
+void B15F::writeByte(uint8_t b)
+{
+	usart.put(b);
+}
+
+uint8_t B15F::readByte()
+{
+	char b;
+	while(1)
+	{
+		if (usart.get(b))
+			return static_cast<uint8_t>(b);
+	}
+}
+	
 B15F& B15F::getInstance(void)
 {
 	if(!instance)
diff --git a/drv/b15f.h b/drv/b15f.h
index 82df289..bd50299 100644
--- a/drv/b15f.h
+++ b/drv/b15f.h
@@ -2,6 +2,20 @@
 #define B15F_h
 
 #include <iostream>
+#include <bits/stdc++.h>
+#include <string>
+#include <fstream>
+#include <cstdlib>
+#include <cstdint>
+
+/*#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <termios.h>*/
+
+#include "driverexception.h"
+
 
 class B15F
 {
@@ -9,10 +23,21 @@ private:
 	B15F(void); // privater Konstruktor
 public:
 	void init(void);
+	bool testConnection(void);
+	void writeByte(uint8_t);
+	uint8_t readByte(void);
+	
 	static B15F& getInstance(void);
 
 private:
+	std::fstream usart; 
+
 	static B15F* instance;
+
+// CONSTANTS
+	const std::string SERIAL_DEVICE = "/dev/ttyUSB0";
+	constexpr static uint8_t MSG_OK = 0xFF;
+	constexpr static uint8_t MSG_FAIL = 0xFE;
 };
 
 #endif // B15F_h
diff --git a/drv/b15f.o b/drv/b15f.o
index 66aeb6e..b886f7c 100644
Binary files a/drv/b15f.o and b/drv/b15f.o differ
diff --git a/drv/driverexception.h b/drv/driverexception.h
new file mode 100644
index 0000000..8352fd4
--- /dev/null
+++ b/drv/driverexception.h
@@ -0,0 +1,32 @@
+#ifndef DRIVEREXCEPTION_H
+#define DRIVEREXCEPTION_H
+
+#include <exception>
+
+// SOURCE: https://stackoverflow.com/a/8152888
+
+class DriverException: public std::exception
+{
+public:
+	explicit DriverException(const char* message) : msg_(message)
+	{
+      	}
+
+	explicit DriverException(const std::string& message) : msg_(message)
+	{
+	}
+
+    	virtual ~DriverException() throw ()
+	{
+	}
+
+	virtual const char* what() const throw ()
+	{
+		return msg_.c_str();
+	}
+
+protected:
+	std::string msg_;
+};
+
+#endif
diff --git a/main b/main
index 2ab378b..e128c81 100755
Binary files a/main and b/main differ
diff --git a/main.cpp b/main.cpp
index 572f019..1a09eaf 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,5 +5,5 @@ int main()
 {
 	B15F& drv = B15F::getInstance();
 	drv.init();
-	std::cout << "heelol" << std::endl;
+	std::cout << "Schluss." << std::endl;
 }
diff --git a/main.o b/main.o
index edd7a31..1045739 100644
Binary files a/main.o and b/main.o differ