diff --git a/B15F.elf b/B15F.elf
index 93dac83..d3266c5 100644
Binary files a/B15F.elf and b/B15F.elf differ
diff --git a/B15F.hex b/B15F.hex
index abe4f42..6e381a3 100644
--- a/B15F.hex
+++ b/B15F.hex
@@ -8,14 +8,14 @@
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 :100080000C9489000C9489000C948900E900EB0021
 :10009000ED00E400EF00F100F300F500F700F900D7
-:1000A000FB00FD00D804D504D2049B04CF04CC048B
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+:1000A000FB00FD0051054E054B05140548054505AF
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 :1000C0001FBECFEFD0E4DEBFCDBF11E0A0E0B1E0B6
-:1000D000E0E2FAE000E00BBF02C007900D92A2320E
+:1000D000E2E1FBE000E00BBF02C007900D92A2320C
 :1000E000B107D9F721E0A2E2B1E001C01D92A4332B
 :1000F000B207E1F710E0CFE5D0E004C02197FE01A0
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 :10013000640160E08DE291E00E9443016FEF8DE287
 :1001400091E00E9464016FEF8AE291E00E946401F5
@@ -24,12 +24,12 @@
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 :100180000FBE08950FB6F894A8958091600088611D
 :1001900080936000109260000FBE82E291E00E94A6
-:1001A0006B03E82F98E088E10FB6F894A895809348
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 :1001B00060000FBE90936000A8958E2F90E0FC0128
 :1001C0003197EC30F10508F00895EA5BFF4F0C948D
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 :100210008CBD81E08DBD8BB1837E8BB95A9A5B9A80
 :100220005C9A08958BB1837E8BB98BB160FD10C051
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diff --git a/b15f.aws b/b15f.aws
index 1407eab..1120d7e 100644
--- a/b15f.aws
+++ b/b15f.aws
@@ -1 +1 @@
-<AVRWorkspace><IOSettings><CurrentRegisters/></IOSettings><part name="ATMEGA1284"/><Files><File00000 Name="F:\Makefile" Position="342 159 1436 523" LineCol="31 19" State="Maximized"/><File00001 Name="F:\main.cpp" Position="430 275 1528 643" LineCol="58 9" State="Maximized"/><File00002 Name="F:\requests.h" Position="294 71 1501 647" LineCol="10 0" State="Maximized"/><File00003 Name="F:\requests.cpp" Position="320 130 1418 498" LineCol="21 16" State="Maximized"/></Files></AVRWorkspace>
+<AVRWorkspace><IOSettings><CurrentRegisters/></IOSettings><part name="ATMEGA1284"/><Files/></AVRWorkspace>
diff --git a/requests.cpp b/requests.cpp
index b9e5361..3a83465 100644
--- a/requests.cpp
+++ b/requests.cpp
@@ -96,10 +96,26 @@ void rqAdcDacStroke()
 	{
 		dac0.setValue(i);
 		wdt_reset();
-		uint16_t a = adu.getValue(channel_a);
-		uint16_t b = adu.getValue(channel_b);
-		usart.writeInt(a);
-		usart.writeInt(b);	
+
+		union doubleword
+		{
+			uint16_t word[2];
+			uint8_t  byte[4];
+		};
+
+		union doubleword dw;
+		dw.word[0] = adu.getValue(channel_a);
+		dw.word[1] = adu.getValue(channel_b);
+		
+		uint8_t ret = 0;
+		do
+		{
+			wdt_reset();
+			ret = usart.writeBlock(&(dw.byte[0]), 4);
+
+			if(ret == 0)
+				return;
+		} while(ret != USART::MSG_OK);
 	}
 	
 	usart.writeByte(USART::MSG_OK);
diff --git a/usart.cpp b/usart.cpp
index abe48b5..6f470b0 100644
--- a/usart.cpp
+++ b/usart.cpp
@@ -45,6 +45,28 @@ void USART::writeStr(const char* str, uint8_t len)
 		writeByte(*str++);
 }
 
+uint8_t USART::writeBlock(uint8_t* ptr, uint8_t len)
+{
+	writeByte(len);
+
+	uint8_t crc = 0;
+	while(len--)
+    {
+		writeByte(*ptr);
+		crc ^= *ptr++;
+		for (uint8_t i = 0; i < 8; i++)
+		{
+			if (crc & 1)
+				crc ^= CRC7_POLY;
+			crc >>= 1;
+		}
+	}
+
+	writeByte(crc);
+
+	return readByte();
+}
+
 uint8_t USART::readByte()
 {
 	while (!(UCSR0A & (1<<RXC0)));
diff --git a/usart.h b/usart.h
index d6acd76..df69993 100644
--- a/usart.h
+++ b/usart.h
@@ -6,6 +6,7 @@
 #include <stdint.h>
 
 constexpr uint32_t BAUDRATE = 115200; // 38400
+constexpr uint8_t  CRC7_POLY = 0x91;
 
 class USART
 {
@@ -16,6 +17,7 @@ public:
 	void writeInt(uint16_t);
 	void writeLong(uint32_t);
 	void writeStr(const char*, uint8_t);
+	uint8_t writeBlock(uint8_t*, uint8_t);
 	uint8_t readByte(void);
 	uint16_t readInt(void);
 	uint32_t readLong(void);