diff --git a/TimeoutSerial.cpp b/TimeoutSerial.cpp
index 8b49dac..7337a81 100755
--- a/TimeoutSerial.cpp
+++ b/TimeoutSerial.cpp
@@ -134,6 +134,19 @@ void TimeoutSerial::read(char *data, size_t size)
     }
 }
 
+int TimeoutSerial::readChar(int delay)
+{
+    vector<char> result(1,'\0');
+    
+    timeout = posix_time::seconds(delay); 
+    try {
+        result = read(1);
+        return static_cast<int>(result[0]);
+    } catch (boost::system::system_error& e) {
+        return -1;
+    }
+}
+
 std::vector<char> TimeoutSerial::read(size_t size)
 {
     vector<char> result(size,'\0');//Allocate a vector with the desired size
diff --git a/TimeoutSerial.h b/TimeoutSerial.h
index 0e715ea..52b7264 100755
--- a/TimeoutSerial.h
+++ b/TimeoutSerial.h
@@ -161,6 +161,7 @@ public:
      * \throws timeout_exception in case of timeout
      */
     std::string readStringUntil(const std::string& delim="\n");
+    int readChar(int delay);
 
     void setRTS(bool enabled);
     void setDTR(bool enabled);
diff --git a/XModem.cpp b/XModem.cpp
index 79eac40..0d7d6a8 100644
--- a/XModem.cpp
+++ b/XModem.cpp
@@ -21,6 +21,7 @@
 #include <string.h>
 
 #include "XModem.h"
+#include "TimeoutSerial.h"
 #ifdef UTEST
 #include "CppUTestExt/MockSupport.h"
 #endif
@@ -35,24 +36,17 @@ const int XModem::receiveDelay=7000;
 const int XModem::rcvRetryLimit = 10;
 
 
-
-
-XModem::XModem(int (*recvChar)(int msDelay),
-               void (*sendData)(const char *data, int len))
+XModem::XModem(TimeoutSerial *serial)
 {
-	this->sendData = sendData;
-	this->recvChar = recvChar;
-	this->dataHandler = NULL;
-	
+	this->serial = serial;
+	this->dataHandler = NULL;	
 }
-XModem::XModem(int (*recvChar)(int msDelay),
-               void (*sendData)(const char *data, int len),
+
+XModem::XModem(TimeoutSerial *serial,
                bool (*dataHandler)(unsigned long number, char *buffer, int len))
 {
-	this->sendData = sendData;
-	this->recvChar = recvChar;
+	this->serial = serial;
 	this->dataHandler = dataHandler;
-	
 }
 
 bool XModem::dataAvail(int delay)
diff --git a/XModem.h b/XModem.h
index e6344ec..442aa42 100644
--- a/XModem.h
+++ b/XModem.h
@@ -41,6 +41,7 @@ class XModem {
 		char buffer[133];
 		//repeated block flag
 		bool repeatedBlock;
+		TimeoutSerial *serial;
 
 		int  (*recvChar)(int);
                 void (*sendData)(const char *data, int len);
@@ -56,6 +57,8 @@ class XModem {
 		bool receiveFrames(transfer_t transfer);
 		bool sendNack(void);
 		void init(void);
+		void sendSerialData(const char *data, int len);
+		int recvSerialChar(int);
 		
 		bool transmitFrames(transfer_t);
 		unsigned char generateChkSum(const char *buffer, int len);
@@ -67,9 +70,8 @@ class XModem {
 		static const unsigned char EOT;
 		static const unsigned char CAN;
 	
-		XModem(int (*recvChar)(int), void (*sendData)(const char *data, int len));
-		XModem(int (*recvChar)(int), void (*sendData)(const char *data, int len), 
-  			        bool (*dataHandler)(unsigned long, char*, int));
+		XModem(TimeoutSerial *serial);
+		XModem(TimeoutSerial *serial,bool (*dataHandler)(unsigned long, char*, int));
 		bool receive();
 		bool transmit();