diff --git a/slsDetectorSoftware/commonFiles/sls_detector_defs.h b/slsDetectorSoftware/commonFiles/sls_detector_defs.h
index 6f0d65627..84a5c1c63 100755
--- a/slsDetectorSoftware/commonFiles/sls_detector_defs.h
+++ b/slsDetectorSoftware/commonFiles/sls_detector_defs.h
@@ -349,6 +349,8 @@ enum channelRegisterBit {
   ANALOG_SIGNAL_ENABLE=0x200, /**< mask of the analogue output enable bit  */
   CALIBRATION_ENABLE=0x300, /**< mask of the calibration input enable bit  */
 };
+
+#define TRIMBITMASK 0x3f
 /** 
    meaning of the chip register bits
    \see ::sls_detector_chip
diff --git a/slsDetectorSoftware/slsDetector/slsDetector.cpp b/slsDetectorSoftware/slsDetector/slsDetector.cpp
index 92515b7a2..e27d44653 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetector.cpp
@@ -2823,7 +2823,7 @@ int slsDetector::getChanRegs(double* retval,bool fromDetector){
   //the original array has 0 initialized
   if(chanregs){
     for (int i=0; i<n; i++)
-      retval[i] = (double) chanregs[i];
+      retval[i] = (double) (chanregs[i] & TRIMBITMASK);
   }
   return n;
 }
diff --git a/slsDetectorSoftware/slsDetectorAnalysis/energyConversion.cpp b/slsDetectorSoftware/slsDetectorAnalysis/energyConversion.cpp
index 9512541ea..455ca9908 100644
--- a/slsDetectorSoftware/slsDetectorAnalysis/energyConversion.cpp
+++ b/slsDetectorSoftware/slsDetectorAnalysis/energyConversion.cpp
@@ -153,7 +153,7 @@ slsDetectorDefs::sls_detector_module* energyConversion::readSettingsFile(string
 #ifdef VERBOSE
 		//		 std::cout<< "trimbits " << ival ;
 #endif
-		 myMod->chanregs[ichip*nch+ichan]|=ival&0x3f;
+		 myMod->chanregs[ichip*nch+ichan]|=ival&TRIMBITMASK;
 		 break;
 	      case 1:
 #ifdef VERBOSE
@@ -297,7 +297,7 @@ int energyConversion::writeSettingsFile(string fname, detectorType myDetectorTyp
 	  outfile << names[idac] << " " << iv1 << std::endl;
 	  for (ichan=0; ichan<nch; ichan++) {
 	    iv=mod.chanregs[ichip*nch+ichan];
-	    iv1= (iv&0x3f);
+	    iv1= (iv&TRIMBITMASK);
 	    outfile <<iv1 << " ";
 	    nb=9;
 	    iv1=((iv&(1<<nb))>>nb);