diff --git a/slsDetectorSoftware/commonFiles/error_defs.h b/slsDetectorSoftware/commonFiles/error_defs.h
index ac4f5b930..c353670c6 100644
--- a/slsDetectorSoftware/commonFiles/error_defs.h
+++ b/slsDetectorSoftware/commonFiles/error_defs.h
@@ -41,6 +41,9 @@ using namespace std;
 #define COULD_NOT_CONFIGURE_MAC				0x0002000000000000ULL
 #define COULDNOT_START_RECEIVER				0x0001000000000000ULL // default error like starting threads
 #define COULDNOT_STOP_RECEIVER				0x0000800000000000ULL
+#define RECEIVER_DET_POSID_NOT_SET			0x0000400000000000ULL
+#define RECEIVER_MULTI_DET_SIZE_NOT_SET		0x0000200000000000ULL
+
 //											0xFFFFFFF000000000ULL
 
 //											0x0000000FFFFFFFFFULL
@@ -136,6 +139,12 @@ public:
 		if(slsErrorMask&DETECTOR_ACTIVATE)
 			retval.append("Could not activate/deactivate detector\n");
 
+		if(slsErrorMask&RECEIVER_DET_POSID_NOT_SET)
+			retval.append("Could not set detector position id\n");
+
+		if(slsErrorMask&RECEIVER_MULTI_DET_SIZE_NOT_SET)
+			retval.append("Could not set multi detector size\n");
+
 
 
 
diff --git a/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp b/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp
index 99bc5d025..82dc3cf0f 100644
--- a/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp
+++ b/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp
@@ -776,7 +776,21 @@ int multiSlsDetector::addSlsDetector(detectorType t, int pos) {
 
 
 
+void multiSlsDetector::getNumberOfDetectors(int& nx, int& ny) {
+	nx = 0; ny = 0;
 
+	int offsetx = -1, offsety = -1;
+	for (int i = 0; i < thisMultiDetector->numberOfDetectors; ++i) {
+		if (thisMultiDetector->offsetX[i] > offsetx) {
+			nx++;
+			offsetx = thisMultiDetector->offsetX[i];
+		}
+		if (thisMultiDetector->offsetY[i] > offsety) {
+			ny++;
+			offsety = thisMultiDetector->offsetY[i];
+		}
+	}
+}
 
 
 
diff --git a/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.h b/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.h
index 29e3e5701..61250871c 100644
--- a/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.h
+++ b/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.h
@@ -322,6 +322,12 @@ class multiSlsDetector  : public slsDetectorUtils {
       \returns number of detectors */
   int getNumberOfDetectors() {return thisMultiDetector->numberOfDetectors;};
 
+  /** returns the number of detectors in each direction
+   	   \param nx number of detectors in x direction
+   	   \param ny number of detectors in y direction
+   */
+  void getNumberOfDetectors(int& nx, int& ny);
+
   int getMaxMods();
   int getNMods();
   int getMaxMod(dimension d);
diff --git a/slsDetectorSoftware/slsDetector/slsDetector.cpp b/slsDetectorSoftware/slsDetector/slsDetector.cpp
index 9dd102edc..e89323895 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetector.cpp
@@ -5813,6 +5813,7 @@ char* slsDetector::setReceiver(string receiverIP){
 #ifdef VERBOSE
 		std::cout << "Setting up receiver with" << endl;
 		std::cout << "detector type:" << slsDetectorBase::getDetectorType(thisDetector->myDetectorType) << endl;
+		std::cout << "detector id:" << posId << endl;
 		std::cout << "detector hostname:" << thisDetector->hostname << endl;
 		std::cout << "file path:" << fileIO::getFilePath() << endl;
 		std::cout << "file name:" << fileIO::getFileName() << endl;
@@ -5830,6 +5831,9 @@ char* slsDetector::setReceiver(string receiverIP){
 /** enable compresison, */
 #endif
 		if(setDetectorType()!= GENERIC){
+			if(!posId)
+				sendMultiDetectorSize();
+			setDetectorId();
 			setDetectorHostname();
 			setFilePath(fileIO::getFilePath());
 			setFileName(fileIO::getFileName());
@@ -7437,10 +7441,10 @@ string slsDetector::setFileName(string s) {
 	if(!s.empty()){
 		pthread_mutex_lock(&ms);
 		fileIO::setFileName(s);
-		if(thisDetector->myDetectorType == EIGER)
+		/*if(thisDetector->myDetectorType == EIGER)
 			parentDet->setDetectorIndex(posId);
 		else if(parentDet->getNumberOfDetectors()>1)
-			parentDet->setDetectorIndex(posId);
+			parentDet->setDetectorIndex(-1);*/
 		s=parentDet->createReceiverFilePrefix();
 		pthread_mutex_unlock(&ms);
 	}
@@ -8190,6 +8194,54 @@ int slsDetector::enableReceiverCompression(int i){
 
 
 
+void slsDetector::sendMultiDetectorSize(){
+	int fnum=F_SEND_RECEIVER_MULTIDETSIZE;
+	int ret = FAIL;
+	int retval = -1;
+	int arg[2];
+
+	pthread_mutex_lock(&ms);
+	parentDet->getNumberOfDetectors(arg[0],arg[1]);
+	pthread_mutex_unlock(&ms);
+
+	if(thisDetector->receiverOnlineFlag==ONLINE_FLAG){
+#ifdef VERBOSE
+		std::cout << "Sending multi detector size to Receiver (" << arg[0] << "," << arg[1] << ")" << std::endl;
+#endif
+		if (connectData() == OK){
+			ret=thisReceiver->sendIntArray(fnum,retval,arg);
+			disconnectData();
+		}
+		if((ret==FAIL)){
+			std::cout << "Could not set position Id" << std::endl;
+			setErrorMask((getErrorMask())|(RECEIVER_MULTI_DET_SIZE_NOT_SET));
+		}
+	}
+}
+
+
+void slsDetector::setDetectorId(){
+	int fnum=F_SEND_RECEIVER_DETPOSID;
+	int ret = FAIL;
+	int retval = -1;
+	int arg = posId;
+
+	if(thisDetector->receiverOnlineFlag==ONLINE_FLAG){
+#ifdef VERBOSE
+		std::cout << "Sending detector pos id to Receiver " << posId << std::endl;
+#endif
+		if (connectData() == OK){
+			ret=thisReceiver->sendInt(fnum,retval,arg);
+			disconnectData();
+		}
+		if((ret==FAIL) || (retval != arg)){
+			std::cout << "Could not set position Id" << std::endl;
+			setErrorMask((getErrorMask())|(RECEIVER_DET_POSID_NOT_SET));
+		}
+	}
+}
+
+
 void slsDetector::setDetectorHostname(){
 	int fnum=F_SEND_RECEIVER_DETHOSTNAME;
 	int ret = FAIL;
diff --git a/slsDetectorSoftware/slsDetector/slsDetector.h b/slsDetectorSoftware/slsDetector/slsDetector.h
index bd02b3b31..0637dc2f9 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.h
+++ b/slsDetectorSoftware/slsDetector/slsDetector.h
@@ -1753,7 +1753,17 @@ class slsDetector : public slsDetectorUtils, public energyConversion {
    */
   int enableReceiverCompression(int i = -1);
 
-  /** send the detector host name to the eiger receiver
+  /**
+   * Send the multi detector size to the detector
+   */
+  void sendMultiDetectorSize();
+
+  /** send the detector pos id to the receiver
+   * for various file naming conventions for multi detectors in receiver
+   */
+  void setDetectorId();
+
+  /** send the detector host name to the  receiver
    * for various handshaking required with the detector
    */
   void setDetectorHostname();