Fixed a bug with inproperly cleared MsgTxt in SINQAxis

Extended pmacAxis to properly deal with HRPT pmac motors which have an extra error condition

sinqEPICSApp/src/pmacAxis.h

@@ -33,7 +33,7 @@ class pmacAxis : public SINQAxis
   asynStatus poll(bool *moving);
   asynStatus setPosition(double position);
   
-  private:
+  protected:
   pmacController *pC_;
   
   asynStatus getAxisStatus(bool *moving);
@@ -60,5 +60,19 @@ class pmacAxis : public SINQAxis
   friend class pmacController;
 };
 
+class pmacHRPTAxis : public pmacAxis
+{
+ public: 
+ pmacHRPTAxis(pmacController *pController, int axisNo) : pmacAxis(pController,axisNo) {};
+  /**
+   * Override getAxisStatus in order to read the special parameter indicating a
+   * slit blade crash at HRPT
+   */
+  asynStatus getAxisStatus(bool *moving);
+
+ protected:
+  friend class pmacController;
+  
+};
 
 #endif /* pmacAxis_H */