diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index b8c3100..4282b83 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -1135,12 +1135,7 @@ bool DCCEXParser::parseS(Print *stream, int16_t params, int16_t p[])
         return true;
 
     case 0: // <S> list sensor definitions
-      if (Sensor::firstSensor == NULL)
-        return false;
-      for (Sensor *tt = Sensor::firstSensor; tt != NULL; tt = tt->nextSensor)
-      {
-          StringFormatter::send(stream, F("<Q %d %d %d>\n"), tt->data.snum, tt->data.pin, tt->data.pullUp);
-      }
+      Sensor::dumpAll(stream);
       return true;
 
     default: // invalid number of arguments
diff --git a/EXRAIL2MacroReset.h b/EXRAIL2MacroReset.h
index 60cdd07..092791e 100644
--- a/EXRAIL2MacroReset.h
+++ b/EXRAIL2MacroReset.h
@@ -98,6 +98,7 @@
 #undef IFBITMAP_ANY
 #undef INVERT_DIRECTION 
 #undef JMRI_SENSOR
+#undef JMRI_SENSOR_NOPULLUP
 #undef JOIN 
 #undef KILLALL
 #undef LATCH 
@@ -684,11 +685,18 @@
 #define INVERT_DIRECTION 
 /**
  * @def JMRI_SENSOR(vpin,count...)
- * @brief Defines multiple JMRI <s> type sensor feedback definitions each with id matching vpin
+ * @brief Defines multiple JMRI <s> type sensor feedback definitions each with id matching vpin and INPUT_PULLUP
  * @param vpin first vpin number
  * @param count... Number of consecutine VPINS for which to create JMRI sensor feedbacks. Default 1. 
  */
 #define JMRI_SENSOR(vpin,count...)
+/**
+ * @def JMRI_SENSOR_NOPULLUP(vpin,count...)
+ * @brief Defines multiple JMRI <s> type sensor feedback definitions each with id matching vpin
+ * @param vpin first vpin number
+ * @param count... Number of consecutine VPINS for which to create JMRI sensor feedbacks. Default 1. 
+ */
+#define JMRI_SENSOR_NOPULLUP(vpin,count...)
 /**
  * @def JOIN
  * @brief Switches PROG track to receive MAIN track DCC packets. (Drive on PROG track)
diff --git a/EXRAILMacros.h b/EXRAILMacros.h
index e2eb3f0..9366658 100644
--- a/EXRAILMacros.h
+++ b/EXRAILMacros.h
@@ -117,12 +117,19 @@ bool exrailHalSetup1() {
   { \
    const int npins=#count[0]? count+0:1; \
    static byte state_map[(npins+7)/8]; \
-   SensorGroup::doSensorGroup(vpin,npins,state_map,action,&USB_SERIAL); \
+   SensorGroup::doSensorGroup(vpin,npins,state_map,action,&USB_SERIAL,true); \
+  }
+#undef JMRI_SENSOR_NOPULLUP
+#define JMRI_SENSOR_NOPULLUP(vpin,count...) \
+  { \
+   const int npins=#count[0]? count+0:1; \
+   static byte state_map[(npins+7)/8]; \
+   SensorGroup::doSensorGroup(vpin,npins,state_map,action,&USB_SERIAL,false); \
   }
 
 void SensorGroup::doExrailSensorGroup(GroupProcess action, Print * stream) {
-   (void)   action; // suppress unused warning
-   (void)   stream; // suppress unused warning 
+   (void)   action; // suppress unused warnings if no groups
+   (void)   stream;
    #include "myAutomation.h"
 }
 
@@ -135,7 +142,7 @@ void SensorGroup::doExrailSensorGroup(GroupProcess action, Print * stream) {
 void exrailHalSetup2() {
    #include "myAutomation.h"
    // pullup any group sensors
-   SensorGroup::pullupAll();
+   SensorGroup::prepareAll();
 }
 
 // Pass 1c detect compile time featurtes
@@ -513,6 +520,7 @@ int RMFT2::onLCCLookup[RMFT2::countLCCLookup];
 #define IFBITMAP_ANY(vpin,mask) OPCODE_IFBITMAP_ANY,V(vpin),OPCODE_PAD,V(mask),
 #define INVERT_DIRECTION OPCODE_INVERT_DIRECTION,0,0,
 #define JMRI_SENSOR(vpin,count...)
+#define JMRI_SENSOR_NOPULLUP(vpin,count...)
 #define JOIN OPCODE_JOIN,0,0,
 #define KILLALL OPCODE_KILLALL,0,0,
 #define LATCH(sensor_id) OPCODE_LATCH,V(sensor_id),
diff --git a/SensorGroup.cpp b/SensorGroup.cpp
index e11224b..78fa813 100644
--- a/SensorGroup.cpp
+++ b/SensorGroup.cpp
@@ -1,29 +1,36 @@
 #include "SensorGroup.h"
 
+#ifdef EXRAIL_ACTIVE
+
 // called in loop to check sensors
 void SensorGroup::checkAll() {
-    #ifdef EXRAIL_ACTIVE
     doExrailSensorGroup(GroupProcess::check, & USB_SERIAL);
-    #endif
 }
 
 // called by command to get sensor list   
 void SensorGroup::printAll(Print * serial) {
     (void)serial; // suppress unused warning
-    #ifdef EXRAIL_ACTIVE
     doExrailSensorGroup(GroupProcess::print,serial);
-    #endif
 }
 
-void SensorGroup::pullupAll() {
-    #ifdef EXRAIL_ACTIVE
-    doExrailSensorGroup(GroupProcess::pullup, & USB_SERIAL);
-    #endif
+void SensorGroup::prepareAll() {
+    doExrailSensorGroup(GroupProcess::prepare, & USB_SERIAL);
 }
 
+void SensorGroup::dumpAll(Print * stream) {
+    doExrailSensorGroup(GroupProcess::dump, stream);
+}
+
+#else
+// if EXRAIL is not active, these functions are empty
+void SensorGroup::checkAll() {}
+void SensorGroup::printAll(Print * serial) {(void)serial;}
+void SensorGroup::prepareAll() {}
+#endif 
+
 // called by EXRAIL constructed doExrailSensorGroup for each group 
 void SensorGroup::doSensorGroup(VPIN firstVpin, int nPins, byte* statebits,
-  GroupProcess action, Print * serial) {
+  GroupProcess action, Print * serial, bool pullup) {
   
   // Loop through the pins in the group  
   for (auto i=0;i<nPins;i++) {   
@@ -32,8 +39,8 @@ void SensorGroup::doSensorGroup(VPIN firstVpin, int nPins, byte* statebits,
     byte stateMask=1<<(i%8);
     VPIN vpin= firstVpin+i;
     switch(action) {
-      case GroupProcess::pullup:
-          IODevice::configureInput(vpin, true);
+      case GroupProcess::prepare:
+          IODevice::configureInput(vpin, pullup);
           __attribute__ ((fallthrough)); // to  check the current state 
     
       case GroupProcess::check:
@@ -41,13 +48,18 @@ void SensorGroup::doSensorGroup(VPIN firstVpin, int nPins, byte* statebits,
          if ((bool)(statebits[stateByte]&stateMask) ==IODevice::read(vpin)) break; // no change  
          // flip state bit
          statebits[stateByte]^=stateMask;
-         if (action==GroupProcess::pullup) break; 
+         if (action==GroupProcess::prepare) break; 
          // fall through to print the changed value  
         __attribute__ ((fallthrough));
       
       case GroupProcess::print:
         StringFormatter::send(serial, F("<%c %d>\n"), 
-         (statebits[stateByte]&stateMask)?'Q':'q', firstVpin+i);
+         (statebits[stateByte]&stateMask)?'Q':'q', vpin);
+         break;
+
+      case GroupProcess::dump:
+        StringFormatter::send(serial, F("<Q %d %d %c>\n"), 
+         vpin, vpin, pullup?'1':'0');
          break;
     } 
   }
diff --git a/SensorGroup.h b/SensorGroup.h
index bb65aed..6f8c9c0 100644
--- a/SensorGroup.h
+++ b/SensorGroup.h
@@ -9,15 +9,19 @@
 // reference to the optional exrail built function which contains the 
 // calls to SensorGroup::doSensorGroup 
 
-enum GroupProcess:byte {pullup,print,check};
+enum GroupProcess:byte {prepare,print,check,dump};
 
 class SensorGroup {
     public:
      static void checkAll();
      static void printAll(Print * serial);
-     static void pullupAll();
+     static void prepareAll();
+     static void dumpAll(Print* serial);
+
+     // doSensorGroup is called from the automatically 
+     // built doExrailSensorGroup, once for each user defined group.
      static void doSensorGroup(VPIN vpin, int nPins, byte* statebits,
-        GroupProcess action, Print * serial);
+        GroupProcess action, Print * serial, bool pullup=false);
      private: 
        static void doExrailSensorGroup(GroupProcess action, Print * stream);  
 };
diff --git a/Sensors.cpp b/Sensors.cpp
index 760e138..2e42f4d 100644
--- a/Sensors.cpp
+++ b/Sensors.cpp
@@ -191,7 +191,18 @@ void Sensor::printAll(Print *stream){
   for(Sensor * tt=firstSensor;tt!=NULL;tt=tt->nextSensor){
     StringFormatter::send(stream, F("<%c %d>\n"), tt->active ? 'Q' : 'q', tt->data.snum);
   }
-} // Sensor::printAll
+} 
+
+void Sensor::dumpAll(Print *stream){
+  
+  if (stream == NULL) return; // Nothing to do
+    
+  SensorGroup::dumpAll(stream);
+  for(Sensor * tt=firstSensor;tt!=NULL;tt=tt->nextSensor){
+    StringFormatter::send(stream, F("<Q %d %d %d>\n"),
+      tt->data.snum, tt->data.pin,tt->data.pullUp);
+  }
+} // Sensor::dumpAll
 
 ///////////////////////////////////////////////////////////////////////////////
 // Static Function to create/find Sensor object.
diff --git a/Sensors.h b/Sensors.h
index c1550e0..f69db09 100644
--- a/Sensors.h
+++ b/Sensors.h
@@ -82,6 +82,8 @@ public:
   static bool remove(int id);  
   static void checkAll();
   static void printAll(Print *stream);
+  static void dumpAll(Print* stream);
+  
   static unsigned long lastReadCycle; // value of micros at start of last read cycle
   static const unsigned int cycleInterval = 10000; // min time between consecutive reads of each sensor in microsecs.
                                                    // should not be less than device scan cycle time.