diff --git a/drv/b15f.cpp b/drv/b15f.cpp
index a6ace00..fc4ef28 100644
--- a/drv/b15f.cpp
+++ b/drv/b15f.cpp
@@ -8,24 +8,52 @@ B15F::B15F()
 
 void B15F::init(void)
 {
+	
+	std::cout << PRE << "Stelle Verbindung mit Adapter her... ";
 	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());
+	usart = open(SERIAL_DEVICE.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
+	struct termios options;
+	tcgetattr(usart, &options);
+	options.c_cflag = baudrate | CS8 | CLOCAL | CREAD; 
+	options.c_iflag = IGNPAR;
+	options.c_oflag = 0;
+	options.c_lflag = 0;
+	options.c_cc[VTIME]=30;
+	tcsetattr(usart, TCSANOW, &options);
+	tcflush(usart, TCIFLUSH);
 	
-	if(!testConnection())
+	std::cout << "OK" << std::endl;
+	
+
+	// Verbindungstest muss dreimal erfolgreich sein
+	std::cout << PRE << "Teste Verbindung... ";
+	for(uint8_t i = 0; i < 3; i++)
 	{
-		throw DriverException("Verbindungstest fehlgeschlagen. Neueste Version im Einsatz?");
+		if(!testConnection())
+		{
+			throw DriverException("Verbindungstest fehlgeschlagen. Neueste Version im Einsatz?");
+		}
 	}
+	std::cout << "OK" << std::endl;
+	
+	writeByte(0xFF);
+	writeByte(0x01);
+	writeByte(0x02);
+	std::cout << readByte() << std::endl;
+	std::cout << readByte() << std::endl;
 }
 
 bool B15F::testConnection(void)
 {
+	// erzeuge zufälliges Byte
 	srand (time(NULL));
 	uint8_t dummy = rand() % 256;
+	
 	writeByte(0); // echo / dummy command for testing
 	writeByte(dummy);
 	
@@ -37,17 +65,65 @@ bool B15F::testConnection(void)
 
 void B15F::writeByte(uint8_t b)
 {
-	usart.put(b);
+	if(write(usart, &b, 1) != 1)
+		throw DriverException("Fehler beim Senden.");
+}
+
+void B15F::writeInt(uint16_t v)
+{
+	// static_cast<char*>(static_cast<void*>(&x));
+	writeByte((v >> 8) & 0xFF);
+	writeByte((v >> 0) & 0xFF);
+}
+
+void B15F::writeLong(uint32_t v)
+{
+	writeByte((v >> 24) & 0xFF);
+	writeByte((v >> 16) & 0xFF);
+	writeByte((v >> 8) & 0xFF);
+	writeByte((v >> 0) & 0xFF);
 }
 
 uint8_t B15F::readByte()
 {
 	char b;
-	while(1)
+	auto start = std::chrono::steady_clock::now();
+	auto end = start;
+	uint16_t elapsed = 0;
+	while(elapsed < timeout)
 	{
-		if (usart.get(b))
+		int n = read(usart, &b, 1);
+		if (n > 0)
 			return static_cast<uint8_t>(b);
+		/*else if(n < -1)
+		{
+			std::string msg = "Fehler bei der seriellen Verbindung. (Code: ";
+			msg += std::to_string(n);
+			msg += ")";
+			throw DriverException(msg);
+		}*/
+			
+		end = std::chrono::steady_clock::now();
+		elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
 	}
+	
+	if(elapsed >= timeout)
+		throw DriverException("Verbindung unterbrochen. (timeout)");
+}
+
+uint16_t B15F::readInt()
+{
+	return readByte() << 8 | readByte();
+}
+
+uint32_t B15F::readLong()
+{
+	return readByte() << 24 | readByte() << 16 | readByte() << 8 | readByte();
+}
+
+void B15F::sleep(uint16_t ms)
+{
+	std::this_thread::sleep_for(std::chrono::milliseconds(ms));
 }
 	
 B15F& B15F::getInstance(void)
diff --git a/drv/b15f.h b/drv/b15f.h
index bd50299..2294934 100644
--- a/drv/b15f.h
+++ b/drv/b15f.h
@@ -6,17 +6,14 @@
 #include <string>
 #include <fstream>
 #include <cstdlib>
+#include <chrono>
 #include <cstdint>
 
-/*#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include <unistd.h>
-#include <termios.h>*/
-
+#include <fcntl.h>
+#include <termios.h>
 #include "driverexception.h"
 
-
 class B15F
 {
 private:
@@ -24,17 +21,27 @@ private:
 public:
 	void init(void);
 	bool testConnection(void);
-	void writeByte(uint8_t);
-	uint8_t readByte(void);
+	
+	inline void writeByte(uint8_t);
+	inline void writeInt(uint16_t);
+	inline void writeLong(uint32_t);
+	inline uint8_t readByte(void);
+	inline uint16_t readInt(void);
+	inline uint32_t readLong(void);
+	
+	void sleep(uint16_t);
 	
 	static B15F& getInstance(void);
 
 private:
-	std::fstream usart; 
+	int usart = -1;
+	uint32_t baudrate = 38400;
+	uint16_t timeout = 1000;
 
 	static B15F* instance;
 
 // CONSTANTS
+	const std::string PRE = "[B15F] ";
 	const std::string SERIAL_DEVICE = "/dev/ttyUSB0";
 	constexpr static uint8_t MSG_OK = 0xFF;
 	constexpr static uint8_t MSG_FAIL = 0xFE;
diff --git a/drv/b15f.o b/drv/b15f.o
index b886f7c..54c9087 100644
Binary files a/drv/b15f.o and b/drv/b15f.o differ
diff --git a/main b/main
index e128c81..02f913e 100755
Binary files a/main and b/main differ