Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -rc67def50892f9a7c2f1f22985b5351465a8f6773 -r933a18d740285e70be9d00696ed0f5a5381bc8e4
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision c67def50892f9a7c2f1f22985b5351465a8f6773)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 933a18d740285e70be9d00696ed0f5a5381bc8e4)
@@ -57,6 +57,55 @@
     NUM_OF_DG_PRESSURE_SENSORS                     ///< Number of pressure sensors.
 } DG_PRESSURE_SENSORS_T;
 
+/// Payload record structure for an RO pump data message.
+typedef struct
+{
+    U32 setPtPSI;
+    F32 measFlowRateMlMin;
+    F32 setPWM;
+} DG_RO_PUMP_DATA_PAYLOAD_T;
+
+/// Payload record structure for a drain pump data message.
+typedef struct
+{
+    U32 setPtRPM;
+    F32 setPWM;
+} DG_DRAIN_PUMP_DATA_PAYLOAD_T;
+
+/// Payload record structure for a DG pressures data message.
+typedef struct
+{
+    F32 roInPSI;
+    F32 roOutPSI;
+    F32 drainInPSI;
+    F32 drainOutPSI;
+} DG_PRESSURES_DATA_PAYLOAD_T;
+
+/// Payload record structure for a reservoirs data message.
+typedef struct
+{
+    U32 resID;
+    U32 setFillToVolumeMl;
+    U32 setDrainToVolumeMl;
+} DG_RESERVOIRS_DATA_PAYLOAD_T;
+
+/// Payload record structure for DG temperature sensors data message.
+typedef struct
+{
+    F32 TPi;
+    F32 TPo;
+    F32 TD1;
+    F32 TD2;
+    F32 TRo;
+    F32 TDi;
+    F32 HtrPrimThermo;
+    F32 HtrTrimThermo;
+    F32 HtrPrimColdJunc;
+    F32 HtrTrimColdJunc;
+    F32 HtrPrimInternal;
+    F32 HtrTrimInternal;
+} DG_TEMPERATURES_T;
+
 // ********** public function prototypes **********
 
 void initDGInterface( void );