diff --git a/site_ansto/hardsup/nhq200util.h b/site_ansto/hardsup/nhq200util.h
index 43126e61..2e4d08fe 100644
--- a/site_ansto/hardsup/nhq200util.h
+++ b/site_ansto/hardsup/nhq200util.h
@@ -2,37 +2,30 @@
   N H Q 2 0 0 U T I L
 
   A few utility functions for talking to a NHQ 200
-  voltage controller via the SINQ setup: TCP/IP--MAC--RS-232--
-  NHQ200.
+  voltage controller via the SINQ setup:
+  TCP/IP===MOXA===RS-232===NHQ200.
 
   Mark Koennecke, Juli 1997
   Mark Lesha, January 2006 (based on ITC4 code)
   Douglas Clowes, December 2006 (based on LAKESHORE340 code)
 
   ----------------------------------------------------------------------------*/
-#ifndef SINQNHQ200
-#define SINQNHQ200
+#ifndef NHQ200_UTIL_H
+#define NHQ200_UTIL_H
 
 /*----------------------- ERRORCODES--------------------------------------
   Most functions return a negative error code on failure. Error codes 
   defined are those defined for serialsinq plus a few additional ones:
  */
 
-#define NHQ200__BADCOM -501
-/* command not recognized */
-#define NHQ200__BADPAR -502 
-/* bad parameter to command */
-#define NHQ200__BADMALLOC -503 
-/* error allocating memory */
-#define NHQ200__BADREAD  -504
-/* error analysing command string on Read */
-#define NHQ200__FAULT	-505
-/* fault or overload condition exists in NHQ200 */
-#define NHQ200__NONHQ200  -510
-/* Controller is not NHQ200  */
-#define NHQ200__BADSET -530
-/* failed three times to set temperature */
-#define NHQ200__READONLY -531
+#define NHQ200__BADCOM    -501 /* command not recognized */
+#define NHQ200__BADPAR    -502 /* bad parameter to command */
+#define NHQ200__BADMALLOC -503 /* error allocating memory */
+#define NHQ200__BADREAD   -504 /* error analysing command string on Read */
+#define NHQ200__FAULT	  -505 /* fault or overload condition exists in NHQ200 */
+#define NHQ200__NONHQ200  -510 /* Controller is not NHQ200  */
+#define NHQ200__BADSET    -530 /* failed three times to set voltage */
+#define NHQ200__READONLY  -531
 /*------------------------------------------------------------------------*/
 typedef struct __NHQ200 {
   int iRead;
@@ -73,16 +66,16 @@ void   NHQ200_Close(pNHQ200 *pData);
 
 int NHQ200_Config(pNHQ200 *pData, int iTmo, int iRead, 
     int iControl, float fDiv, float fMult);
-/***** configure some aspects of a NHQ200temperature controller.
+/***** configure some aspects of a NHQ200 voltage controller.
   The parameter are:
   - a pointer to the data structure for the controller as 
   returned by NHQ200_Open
   - a value for the connection timeout
-  - the temperature sensor to use for reading the 
-  temperature.
-  - the temperature sensor used by the NHQ200controller 
-  for regulating the temperature.
-  - the divisor needed to calculate the real temperature
+  - the voltage sensor to use for reading the 
+   voltage.
+  - the voltage sensor used by the NHQ200controller 
+  for regulating the voltage.
+  - the divisor needed to calculate the real voltage
   from the sensor.     
   The function returns 1 on success, a negative error code on 
   failure.
@@ -100,7 +93,7 @@ int NHQ200_Send(pNHQ200 *pData, char *pCommand, char *pReply, int iLen);
  */
 
 int NHQ200_Read(pNHQ200 *pData, float *fVal);
-/******* reads the current actual temperature of the sensor
+/******* reads the current actual voltage of the sensor
   configured by ConfigNHQ200for reading. The value is returned
   in fVal. The first parameter is a pointer to a NHQ200
   data structure as returned by NHQ200_Open.
@@ -110,7 +103,7 @@ int NHQ200_Read(pNHQ200 *pData, float *fVal);
  */
 
 int NHQ200_Set(pNHQ200 *pData, float fVal);
-/****** sets a new preset temperature in the NHQ200temperature
+/****** sets a new preset voltage in the NHQ200 voltage
   controller. Parameters are:
   - a pointer to a NHQ200data structure as returned by NHQ200_Open.
   - the new preset value.
@@ -126,6 +119,6 @@ void  NHQ200_ErrorTxt(pNHQ200 *pData, int iCode, char *pError, int iLen);
  */         
 
 
-#endif  
+#endif   /* NHQ200_UTIL_H */