diff --git a/slsDetectorSoftware/slsReceiver/eigerReceiver.cpp b/slsDetectorSoftware/slsReceiver/eigerReceiver.cpp
index f1180d51d..81836d6b1 100644
--- a/slsDetectorSoftware/slsReceiver/eigerReceiver.cpp
+++ b/slsDetectorSoftware/slsReceiver/eigerReceiver.cpp
@@ -11,7 +11,7 @@
 
 
 /* uncomment next line to enable debug output */
-// #define EIGER_DEBUG
+#define EIGER_DEBUG
 
 /* macro for debug output */
 #ifdef EIGER_DEBUG
@@ -27,7 +27,7 @@ public:
 	 DEBUG("initialize() with: detectorHostName= " << detectorHostName << ".");
 	}
 
-	char *getDetectorHostname() {
+	char *getDetectorHostname() const {
 		const std::string name = "some_host_name";
 	    char *c = new char[name.length()];
 	    name.copy(c, name.length());
@@ -36,7 +36,7 @@ public:
 	    return(c);
 	}
 
-	char *getFileName() {
+	char *getFileName() const {
 		const std::string name = "some_file_name";
 	    char *c = new char[name.length()];
 	    name.copy(c, name.length());
@@ -45,7 +45,7 @@ public:
 	    return(c);
 	}
 
-	char *getFilePath() {
+	char *getFilePath() const {
 		std::string name = "some_path";
 	    char *c = new char[name.length()];
 	    name.copy(c, name.length());
@@ -54,17 +54,17 @@ public:
 	    return(c);
 	}
 
-	int getDynamicRange() {
+	int getDynamicRange() const {
 		DEBUG("getDynamicRange(): Return 16.");
 		return(16);
 	}
 
-	int getScanTag() {
+	int getScanTag() const {
 		DEBUG("getScanTag(): return 4711.");
 		return(4711);
 	}
 
-	int getNumberOfFrames() {
+	int getNumberOfFrames() const {
 		DEBUG("getNumberOfFrames(): return 42.");
 		return(42);
 	}
@@ -79,7 +79,7 @@ public:
 		return(this->getFilePath());
 	}
 
-	int getEnableFileWrite() {
+	int getEnableFileWrite() const {
 		DEBUG("getEnableFileWrite() returns 1.");
 		return(1);
 	}
diff --git a/slsDetectorSoftware/slsReceiver/eigerReceiver.h b/slsDetectorSoftware/slsReceiver/eigerReceiver.h
index 5aa6a8ef0..32d1ff241 100644
--- a/slsDetectorSoftware/slsReceiver/eigerReceiver.h
+++ b/slsDetectorSoftware/slsReceiver/eigerReceiver.h
@@ -1,4 +1,4 @@
-
+//#define EIGER_RECEIVER
 #ifdef EIGER_RECEIVER
 
 #ifndef EIGERRECEIVER_H
@@ -71,7 +71,7 @@ public:
  	  * caller needs to deallocate the returned char array.
  	  * if uninitialized, it must return NULL
  	 */
- 	virtual char *getDetectorHostname() = 0;
+ 	virtual char *getDetectorHostname() const  = 0;
 
 	/**
 	 * Returns status of receiver: idle, running or error
@@ -84,38 +84,38 @@ public:
 	 * Returns File Name
 	 * caller is responsible to deallocate the returned char array.
 	 */
-	virtual char *getFileName() = 0;
+	virtual char *getFileName() const = 0;
 
 
 	/**
 	 * Returns File Path
 	 * caller is responsible to deallocate the returned char array
 	 */
-	virtual char *getFilePath() = 0; //FIXME: Does the caller need to free() the returned pointer?
+	virtual char *getFilePath() const = 0; //FIXME: Does the caller need to free() the returned pointer?
 
 
 	/**
 	 * Returns the number of bits per pixel
 	 */
-	virtual int getDynamicRange() = 0;
+	virtual int getDynamicRange() const = 0;
 
 	/**
 	 * Returns scan tag
 	 */
-	virtual int getScanTag() = 0;
+	virtual int getScanTag() const = 0;
 
 	/*
 	 * Returns number of frames to receive
 	 * This is the number of frames to expect to receiver from the detector.
 	 * The data receiver will change from running to idle when it got this number of frames
 	 */
-	virtual int getNumberOfFrames() = 0;
+	virtual int getNumberOfFrames() const = 0;
 
 	/**
 	* Returns file write enable
 	* 1: YES 0: NO
 	*/
-	virtual int getEnableFileWrite() = 0;
+	virtual int getEnableFileWrite() const  = 0;
 
 	/**
 	 * Set File Name (without frame index, file index and extension)