diff --git a/tdchm.c b/tdchm.c
index 8b13599..d15f722 100644
--- a/tdchm.c
+++ b/tdchm.c
@@ -48,6 +48,13 @@ typedef struct {
   pECB tdc;
 } Tdc, *pTdc;
 
+/*---------------------- Monitor event data structure (from counter.c) */
+typedef struct {
+  float fPreset;
+  float fCurrent;
+  char *pName;
+} MonEvent, *pMonEvent;
+
 /*=======================================================================*/
 static int downloadConfiguration(pTdc self)
 {
@@ -235,6 +242,7 @@ static int TDCStart(pHistDriver self, SConnection * pCon)
   if (tdc->counter != NULL) {
     tdc->counter->pDriv->fPreset = self->fCountPreset;
     tdc->counter->pDriv->eMode = self->eCount;
+    InvokeCallBack(tdc->counter->pCall,COUNTSTART,NULL);
     return tdc->counter->pDriv->Start(tdc->counter->pDriv);
   }
   return 1;
@@ -279,15 +287,23 @@ static int TDCCountStatus(pHistDriver self, SConnection * pCon)
 {
   pTdc tdc = NULL;
   int tdcstatus, status;
-  float fControl;
+  float fControl, fOldControl;
+  MonEvent sMon;
 
   assert(self);
   tdc = (pTdc) self->pPriv;
   assert(tdc);
 
   if (tdc->counter != NULL) {
+    fOldControl = tdc->counter->pDriv->fLastCurrent;
     status =
         tdc->counter->pDriv->GetStatus(tdc->counter->pDriv, &fControl);
+    if(fOldControl != fControl) {
+        sMon.fCurrent = fControl;
+	sMon.fPreset = tdc->counter->pDriv->fPreset;
+	sMon.pName = tdc->counter->name;
+	InvokeCallBack(tdc->counter->pCall, MONITOR, &sMon);
+    }
   }
   /*
      The TDC does not seem to have a means to figure if it is counting or not
@@ -303,6 +319,7 @@ static int TDCCountStatus(pHistDriver self, SConnection * pCon)
      leave it for now.
    */
   if (status == HWIdle || status == HWFault) {
+    InvokeCallBack(tdc->counter->pCall,COUNTEND,NULL);
     tdcstatus = disableTdc(tdc);
     if (tdcstatus != 1) {
       tdc->errorCode = COMMERROR;