diff --git a/drv/b15f.cpp b/drv/b15f.cpp
index ff95d66..627e3ba 100644
--- a/drv/b15f.cpp
+++ b/drv/b15f.cpp
@@ -264,6 +264,8 @@ uint16_t B15F::analogeEingabe(uint8_t channel)
 
 bool B15F::analogEingabeSequenz(uint8_t channel_a, uint16_t* buffer_a, uint32_t offset_a, uint8_t channel_b, uint16_t* buffer_b, uint32_t offset_b, uint16_t start, int16_t delta, uint16_t count)
 {
+	
+	
 	try
 	{
 		writeByte(RQ_ADC_DAC_STROKE);
@@ -276,19 +278,24 @@ bool B15F::analogEingabeSequenz(uint8_t channel_a, uint16_t* buffer_a, uint32_t
 		
 		if(aw != MSG_OK)
 		{
-			std::cout << PRE << "Mikrocontroller nicht synchronisiert" << std::endl;
-			throw DriverException("Mikrocontroller nicht synchronisiert");
+			discard();
+			return analogEingabeSequenz(channel_a, buffer_a, offset_a, channel_b, buffer_b, offset_b, start, delta, count);
 		}
 			
 		for(uint16_t i = 0; i < count; i++)
 		{
-			buffer_a[offset_a + i] = readInt();
-			buffer_b[offset_b + i] = readInt();
-			if(buffer_a[offset_a + i] > 1023 || buffer_b[offset_b + i] > 1023)
+			uint8_t block[4];
+			bool crc_ok = true;
+			do
 			{
-				std::cout << PRE << "Schlechte Werte gefunden" << std::endl;
-				throw DriverException("Schlechte Werte gefunden");
+				crc_ok = readBlock(&block[0], 0);
+				if(!crc_ok)
+					std::cout << "fordere neu an" << std::endl;
 			}
+			while(!crc_ok);
+			
+			buffer_a[offset_a + i] = ((uint16_t) block[0]) | (((uint16_t) block[1]) << 8);
+			buffer_b[offset_b + i] = ((uint16_t) block[2]) | (((uint16_t) block[3]) << 8);
 		}
 		
 		aw = readByte();		
@@ -356,6 +363,74 @@ uint16_t B15F::readInt()
 	return readByte() | readByte() << 8;
 }
 
+bool B15F::readBlock(uint8_t* buffer, uint16_t offset)
+{
+	uint8_t len = readByte();
+	uint8_t crc = 0;
+	buffer += offset;
+	
+	// wait for block
+	int n_ready;
+	uint16_t elapsed = 0;
+	auto start = std::chrono::steady_clock::now();
+	auto end = start;
+	while(elapsed < block_timeout)
+	{
+		int code = ioctl(usart, FIONREAD, &n_ready);
+		if(code != 0)
+		{
+			std::cout << PRE << "n_ready code: " << code << std::endl;
+			return false;
+		}
+		if(n_ready >= len + 1)
+			break;
+		end = std::chrono::steady_clock::now();
+		elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
+	}
+	if(elapsed >= timeout)
+	{
+		std::cout << PRE << "block timeout: " << std::endl;
+		return false;
+	}
+	
+	while(len--)
+	{
+		int code = read(usart, buffer, 1);
+		if(code != 1)
+		{
+			std::cout << PRE << "read code: " << code << std::endl;
+			return false;
+		}
+		
+		crc ^= *buffer++;
+		for (uint8_t i = 0; i < 8; i++)
+		{
+			if (crc & 1)
+				crc ^= CRC7_POLY;
+			crc >>= 1;
+		}
+	}
+	
+	crc ^= readByte();
+	for (uint8_t i = 0; i < 8; i++)
+	{
+		if (crc & 1)
+			crc ^= CRC7_POLY;
+		crc >>= 1;
+	}
+	
+	if (crc == 0)
+	{
+		writeByte(MSG_OK);
+		return true;
+	}
+	else
+	{
+		writeByte(MSG_FAIL);
+		return false;
+	}
+}
+
 void B15F::delay(uint16_t ms)
 {
 	std::this_thread::sleep_for(std::chrono::milliseconds(ms));
diff --git a/drv/b15f.h b/drv/b15f.h
index c8cf7ca..e88e0a1 100644
--- a/drv/b15f.h
+++ b/drv/b15f.h
@@ -1,5 +1,5 @@
-#ifndef B15F_h
-#define B15F_h
+#ifndef B15F_H
+#define B15F_H
 
 #include <iostream>
 #include <bits/stdc++.h>
@@ -44,6 +44,7 @@ public:
 	inline void writeInt(uint16_t);
 	inline uint8_t readByte(void);
 	inline uint16_t readInt(void);
+	inline bool readBlock(uint8_t* buffer, uint16_t offset);
 	
 	
 	void delay(uint16_t);
@@ -52,18 +53,20 @@ public:
 
 private:
 	int usart = -1;
-	uint16_t timeout = 100; // ms
+	uint16_t timeout = 200; // ms
+	uint16_t block_timeout = 1; // ms
 
 	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;
-	constexpr static uint16_t RECONNECT_TIMEOUT = 32; // ms
-	constexpr static uint8_t RECONNECT_TRIES = 3;
+	constexpr static uint8_t  MSG_OK = 0xFF;
+	constexpr static uint8_t  MSG_FAIL = 0xFE;
+	constexpr static uint16_t RECONNECT_TIMEOUT = 64; // ms
+	constexpr static uint8_t  RECONNECT_TRIES = 3;
 	constexpr static uint32_t BAUDRATE = 115200;
+	constexpr static uint8_t  CRC7_POLY = 0x91;
 	
 	// REQUESTS
 	constexpr static uint8_t RQ_DISC = 0;
@@ -80,4 +83,4 @@ private:
 	constexpr static uint8_t RQ_ADC_DAC_STROKE  = 12;
 };
 
-#endif // B15F_h
+#endif // B15F_H
diff --git a/drv/b15f.o b/drv/b15f.o
index 1a9b773..b909c96 100644
Binary files a/drv/b15f.o and b/drv/b15f.o differ
diff --git a/gnuplotscript.gp b/gnuplotscript.gp
index 9a5aaa5..055440a 100644
--- a/gnuplotscript.gp
+++ b/gnuplotscript.gp
@@ -8,28 +8,29 @@ set xrange [5:0]
 set x2range [5:0]
 set y2range [0:50]
 set yrange [0:50]
-set label at 2,38 'U_{DS} [V] = 300' right
-set label at 2,29 'U_{DS} [V] = 325' right
-set label at 2,31 'U_{DS} [V] = 350' right
-set label at 2,32 'U_{DS} [V] = 375' right
-set label at 2,33 'U_{DS} [V] = 400' right
-set label at 2,20 'U_{DS} [V] = 425' right
-set label at 2,20 'U_{DS} [V] = 450' right
-set label at 2,11 'U_{DS} [V] = 475' right
-set label at 2,21 'U_{DS} [V] = 500' right
-set label at 2,21 'U_{DS} [V] = 525' right
-set label at 2,11 'U_{DS} [V] = 550' right
-set label at 2,11 'U_{DS} [V] = 575' right
-set label at 2,11 'U_{DS} [V] = 600' right
-set label at 2,11 'U_{DS} [V] = 600' right
-set label at 2,11 'U_{DS} [V] = 600' right
-set label at 2,11 'U_{DS} [V] = 600' right
-set label at 2,11 'U_{DS} [V] = 600' right
-set label at 2,11 'U_{DS} [V] = 600' right
+set label at 2,32 'U_{DS} [V] = 300' right
+set label at 2,30 'U_{DS} [V] = 325' right
+set label at 2,33 'U_{DS} [V] = 350' right
+set label at 2,21 'U_{DS} [V] = 375' right
+set label at 2,21 'U_{DS} [V] = 400' right
+set label at 2,5 'U_{DS} [V] = 425' right
+set label at 2,22 'U_{DS} [V] = 450' right
+set label at 2,12 'U_{DS} [V] = 475' right
+set label at 2,23 'U_{DS} [V] = 500' right
+set label at 2,23 'U_{DS} [V] = 525' right
+set label at 2,2 'U_{DS} [V] = 550' right
+set label at 2,12 'U_{DS} [V] = 575' right
+set label at 2,13 'U_{DS} [V] = 600' right
+set label at 2,5 'U_{DS} [V] = 625' right
+set label at 2,6 'U_{DS} [V] = 650' right
+set label at 2,6 'U_{DS} [V] = 675' right
+set label at 2,2 'U_{DS} [V] = 700' right
+set label at 2,2 'U_{DS} [V] = 700' right
+set label at 2,2 'U_{DS} [V] = 700' right
 set y2tics
 unset ytics
 set ytics format ''
 unset output 
 set terminal qt
 unset output
-plot "/tmp/tempfile1" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 300' w l,"/tmp/tempfile2" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 325' w l,"/tmp/tempfile3" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 350' w l,"/tmp/tempfile4" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 375' w l,"/tmp/tempfile5" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 400' w l,"/tmp/tempfile6" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 425' w l,"/tmp/tempfile7" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 450' w l,"/tmp/tempfile8" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 475' w l,"/tmp/tempfile9" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 500' w l,"/tmp/tempfile10" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 525' w l,"/tmp/tempfile11" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 550' w l,"/tmp/tempfile12" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 575' w l,"/tmp/tempfile13" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 600' w l,"/tmp/tempfile14" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 625' w l,"/tmp/tempfile15" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 650' w l,"/tmp/tempfile16" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 675' w l,"/tmp/tempfile17" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 700' w l,"/tmp/tempfile18" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 725' w l
+plot "/tmp/tempfile1" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 300' w l,"/tmp/tempfile2" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 325' w l,"/tmp/tempfile3" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 350' w l,"/tmp/tempfile4" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 375' w l,"/tmp/tempfile5" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 400' w l,"/tmp/tempfile6" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 425' w l,"/tmp/tempfile7" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 450' w l,"/tmp/tempfile8" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 475' w l,"/tmp/tempfile9" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 500' w l,"/tmp/tempfile10" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 525' w l,"/tmp/tempfile11" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 550' w l,"/tmp/tempfile12" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 575' w l,"/tmp/tempfile13" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 600' w l,"/tmp/tempfile14" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 625' w l,"/tmp/tempfile15" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 650' w l,"/tmp/tempfile16" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 675' w l,"/tmp/tempfile17" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 700' w l,"/tmp/tempfile18" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 725' w l,"/tmp/tempfile19" using ($1*0.004888):($2*0.048876) binary format="%int16%int16" endian=big title 'U_{DS} [V] = 750' w l
diff --git a/main b/main
index 6522fb2..ba3e7f8 100755
Binary files a/main and b/main differ
diff --git a/test_plot b/test_plot
index afde276..2e5d10e 100644
Binary files a/test_plot and b/test_plot differ