diff --git a/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp b/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp
index 88dd5e04f..f120c9fd1 100644
--- a/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp
+++ b/slsDetectorSoftware/multiSlsDetector/multiSlsDetector.cpp
@@ -256,7 +256,7 @@ multiSlsDetector::multiSlsDetector(int id) :  slsDetectorUtils(), shmId(-1)
 #ifdef VERBOSE
     cout << thisMultiDetector->detectorIds[i] << endl;
 #endif
-    detectors[i]=new slsDetector(thisMultiDetector->detectorIds[i], this);
+    detectors[i]=new slsDetector(i, thisMultiDetector->detectorIds[i], this);
 
 
     //  setAngularConversionPointer(detectors[i]->getAngularConversionPointer(),detectors[i]->getNModsPointer(),detectors[i]->getNChans()*detectors[i]->getNChips(), i);
@@ -377,7 +377,7 @@ int multiSlsDetector::addSlsDetector(int id, int pos) {
   cout << "Creating new detector " << pos << endl;
 #endif
 
-  detectors[pos]=new slsDetector(id, this);
+  detectors[pos]=new slsDetector(pos, id, this);
   thisMultiDetector->detectorIds[pos]=detectors[pos]->getDetectorId();
   thisMultiDetector->numberOfDetectors++;
   
@@ -692,7 +692,7 @@ int multiSlsDetector::addSlsDetector(const char *name, int pos) {
 #ifdef VERBOSE
 	cout << "Detector " << id << " already exists" << endl;
 #endif
-	s=new slsDetector(id, this);
+	s=new slsDetector(pos, id, this);
 	if (s->getHostname()==string(name))
 	  break;
 	delete s;
@@ -733,7 +733,7 @@ int multiSlsDetector::addSlsDetector(const char *name, int pos) {
 #ifdef VERBOSE
     cout << "Creating detector " << id << " of type "  << getDetectorType(t) << endl;
 #endif
-    s=new slsDetector(t, id, this);
+    s=new slsDetector(pos, t, id, this);
     if (online) {
       s->setTCPSocket(name);
       setOnline(ONLINE_FLAG);
@@ -766,7 +766,7 @@ int multiSlsDetector::addSlsDetector(detectorType t, int pos) {
 #ifdef VERBOSE
   cout << "Creating detector " << id << " of type "  << getDetectorType(t) << endl;
 #endif
-  slsDetector *s=new slsDetector(t, id, this);
+  slsDetector *s=new slsDetector(pos, t, id, this);
   s=NULL;
 #ifdef VERBOSE
   cout << "Adding it to the multi detector structure" << endl;
@@ -5146,7 +5146,7 @@ int multiSlsDetector::createReceivingDataSockets(const bool destroy){
 		}
 		//add port
 		sprintf(dataSocketServerDetails[i],"%s:%d",dataSocketServerDetails[i],DEFAULT_ZMQ_PORTNO +
-				(detectors[i/numSocketsPerDetector]->getDetectorId())*numSocketsPerDetector + (i%numSocketsPerDetector));//using this instead of i in the offchance, detid doesnt start at 0 (shmget error)
+				(i/numSocketsPerDetector)*numSocketsPerDetector + (i%numSocketsPerDetector));//using this instead of i in the offchance, detid doesnt start at 0 (shmget error)
 
 		//create context
 		context[i] = zmq_ctx_new();
diff --git a/slsDetectorSoftware/slsDetector/slsDetector.cpp b/slsDetectorSoftware/slsDetector/slsDetector.cpp
index d621f5f41..079c5e3a6 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetector.cpp
@@ -152,9 +152,10 @@ int slsDetector::freeSharedMemory() {
 
 
 
-slsDetector::slsDetector(int id,multiSlsDetector *p) :slsDetectorUtils(),
+slsDetector::slsDetector(int pos, int id, multiSlsDetector *p) :slsDetectorUtils(),
 						      thisDetector(NULL),
 						      detId(id),
+							  posId(pos),
 							  parentDet(p),
 						      shmId(-1),
 						      controlSocket(NULL),
@@ -204,9 +205,10 @@ slsDetector::slsDetector(int id,multiSlsDetector *p) :slsDetectorUtils(),
 
 
 
-slsDetector::slsDetector(detectorType type, int id,multiSlsDetector *p): slsDetectorUtils(),
+slsDetector::slsDetector(int pos, detectorType type, int id, multiSlsDetector *p): slsDetectorUtils(),
 									 thisDetector(NULL),
 									 detId(id),
+									 posId(pos),
 								     parentDet(p),
 									 shmId(-1),
 									 controlSocket(NULL),
@@ -260,9 +262,10 @@ slsDetector::~slsDetector(){
 delete thisReceiver;
 };
 
-slsDetector::slsDetector(char *name, int id, int cport,multiSlsDetector *p) : slsDetectorUtils(),
+slsDetector::slsDetector(int pos, char *name, int id, int cport,multiSlsDetector *p) : slsDetectorUtils(),
 									      thisDetector(NULL),
 									      detId(id),
+										  posId(pos),
 									      parentDet(p),
 									      shmId(-1),
 									      controlSocket(NULL),
@@ -7271,9 +7274,9 @@ string slsDetector::setFileName(string s) {
 		pthread_mutex_lock(&ms);
 		fileIO::setFileName(s);
 		if(thisDetector->myDetectorType == EIGER)
-			parentDet->setDetectorIndex(detId);
+			parentDet->setDetectorIndex(posId);
 		else if(parentDet->getNumberOfDetectors()>1)
-			parentDet->setDetectorIndex(detId);
+			parentDet->setDetectorIndex(posId);
 		s=parentDet->createReceiverFilePrefix();
 		pthread_mutex_unlock(&ms);
 	}
diff --git a/slsDetectorSoftware/slsDetector/slsDetector.h b/slsDetectorSoftware/slsDetector/slsDetector.h
index 6a177c2ad..6221a661a 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.h
+++ b/slsDetectorSoftware/slsDetector/slsDetector.h
@@ -298,20 +298,22 @@ class slsDetector : public slsDetectorUtils, public energyConversion {
   /** (default) constructor 
       \param  type is needed to define the size of the detector shared memory 9defaults to GENERIC i.e. the largest shared memory needed by any slsDetector is allocated
       \param  id is the detector index which is needed to define the shared memory id. Different physical detectors should have different IDs in order to work independently
+      \param pos is the index of object in the parent multislsdet array
       \param  p is the parent multislsdet to access filename ,path etc
 
   */
 
-  slsDetector(detectorType type=GENERIC, int id=0, multiSlsDetector *p=NULL);
+  slsDetector(int pos, detectorType type=GENERIC, int id=0, multiSlsDetector *p=NULL);
 
   /** constructor
       \param  id is the detector index which is needed to define the shared memory id. Different physical detectors should have different IDs in order to work independently
+      \param pos is the index of object in the parent multislsdet array
       \param  p is the parent multislsdet to access filename ,path etc
   */
-  slsDetector(int id, multiSlsDetector *p=NULL);
+  slsDetector(int pos, int id, multiSlsDetector *p=NULL);
 
 
-  slsDetector(char *name, int id=0,  int cport=DEFAULT_PORTNO, multiSlsDetector *p=NULL);
+  slsDetector(int pos, char *name, int id=0, int cport=DEFAULT_PORTNO, multiSlsDetector *p=NULL);
   //slsDetector(string  const fname);
   //  ~slsDetector(){while(dataQueue.size()>0){}};
   /** destructor */ 
@@ -1416,6 +1418,7 @@ class slsDetector : public slsDetectorUtils, public energyConversion {
   */
 
   int getDetectorId(int i=-1) {return detId;};
+
   /** 
       Receives a data frame from the detector socket
       \returns pointer to the data (or NULL if failed)
@@ -1849,6 +1852,11 @@ class slsDetector : public slsDetectorUtils, public energyConversion {
   */
   int detId;
   
+  /**
+     position ID
+  */
+  int posId;
+
 
   /**
    * parent multi detector