diff --git a/slsDetectorSoftware/eigerDetectorServer/slsDetectorFunctionList.c b/slsDetectorSoftware/eigerDetectorServer/slsDetectorFunctionList.c
index d6a10d6fd..3777ff3a6 100644
--- a/slsDetectorSoftware/eigerDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorSoftware/eigerDetectorServer/slsDetectorFunctionList.c
@@ -236,7 +236,17 @@ int64_t getDetectorId(enum idMode arg){
 
 
 int getDetectorNumber(){
+	int res=0;
 
+	//execute and get address
+	char output[255];
+	FILE* sysFile = popen("more /home/root/executables/detid.txt", "r");
+	fgets(output, sizeof(output), sysFile);
+	pclose(sysFile);
+	sscanf(output,"%d",&res);
+	printf("detector id: %d\n",res);
+
+/*
 	int res=0;
 	char hostname[100];
 	if (gethostname(hostname, sizeof hostname) == 0)
@@ -244,6 +254,7 @@ int getDetectorNumber(){
 	else
 		perror("gethostname");
 	sscanf(hostname,"%x",&res);
+*/
 	return res;
 }
 
diff --git a/slsDetectorSoftware/slsDetector/slsDetector.cpp b/slsDetectorSoftware/slsDetector/slsDetector.cpp
index 00fde2355..952430b5d 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetector.cpp
@@ -3147,8 +3147,8 @@ slsDetectorDefs::detectorSettings slsDetector::setSettings( detectorSettings ise
 			case EIGER:
 				//settings is saved in myMod.reg
 				myMod->reg=thisDetector->currentSettings;
-				ostfn << thisDetector->settingsDir << ssettings <<"/noise.sn"<< setw(6) << hex << getId(DETECTOR_SERIAL_NUMBER) << setbase(10);
-				oscfn << thisDetector->calDir << ssettings << "/calibration.sn"<<setw(6) << hex << getId(DETECTOR_SERIAL_NUMBER) << setbase(10);
+				ostfn << thisDetector->settingsDir << ssettings <<"/noise.sn" << setfill('0') <<  setw(3) << dec << getId(DETECTOR_SERIAL_NUMBER) << setbase(10);
+				oscfn << thisDetector->calDir << ssettings << "/calibration.sn" << setfill('0') <<  setw(3) << dec << getId(DETECTOR_SERIAL_NUMBER) << setbase(10);
 #ifdef VERBOSE
 				std::cout<< thisDetector->settingsDir<<endl<< thisDetector->calDir <<endl;
 #endif
@@ -6009,7 +6009,7 @@ int slsDetector::loadSettingsFile(string fname, int imod) {
     		fn=ostfn.str();
     	}
     }else if (fname.find(".sn")==string::npos && fname.find(".trim")==string::npos && fname.find(".settings")==string::npos) {
-      ostfn << ".sn"  << setw(6) << hex << getId(DETECTOR_SERIAL_NUMBER, im);
+      ostfn << ".sn"  << setfill('0') <<  setw(3) << dec << getId(DETECTOR_SERIAL_NUMBER, im);
       fn=ostfn.str();
     }
     myMod=readSettingsFile(fn, thisDetector->myDetectorType);
@@ -6043,7 +6043,7 @@ int slsDetector::saveSettingsFile(string fname, int imod) {
   for (int im=mmin; im<mmax; im++) {
     ostringstream ostfn;
     if(thisDetector->myDetectorType == EIGER)
-    	ostfn << fname << ".sn"  << setw(6) << hex << getId(DETECTOR_SERIAL_NUMBER);
+    	ostfn << fname << ".sn"  << setfill('0') <<  setw(3) << dec << getId(DETECTOR_SERIAL_NUMBER);
     else
     	ostfn << fname << ".sn"  << setfill('0') << setw(3) << hex << getId(MODULE_SERIAL_NUMBER,im);
     if ((myMod=getModule(im))) {
@@ -6126,7 +6126,7 @@ int slsDetector::loadCalibrationFile(string fname, int imod) {
     		ostfn << ".sn"  << setfill('0') << setw(3) << hex << getId(MODULE_SERIAL_NUMBER, im);
     	}
     }else if (fname.find(".sn")==string::npos && fname.find(".cal")==string::npos) {
-      ostfn << "."  << setw(6) << hex << getId(DETECTOR_SERIAL_NUMBER);
+      ostfn << "."  << setfill('0') <<  setw(3) << dec << getId(DETECTOR_SERIAL_NUMBER);
     }
     fn=ostfn.str();
     if((myMod=getModule(im))){
@@ -6166,7 +6166,7 @@ int slsDetector::saveCalibrationFile(string fname, int imod) {
   for (int im=mmin; im<mmax; im++) {
     ostringstream ostfn;
     if(thisDetector->myDetectorType == EIGER)
-    	ostfn << fname << ".sn"  << setw(6) << hex << getId(DETECTOR_SERIAL_NUMBER);
+    	ostfn << fname << ".sn" << setfill('0') <<  setw(3) << dec << getId(DETECTOR_SERIAL_NUMBER);
     else
     	ostfn << fname << ".sn"  << setfill('0') << setw(3) << hex << getId(MODULE_SERIAL_NUMBER,im);
     if ((myMod=getModule(im))) {