Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -r7c8ec681f8c5dc44674893b5c3924a6203f2c8d0 -r8e7158d8231435496fcf1d5649e51babf859ccc7
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 7c8ec681f8c5dc44674893b5c3924a6203f2c8d0)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 8e7158d8231435496fcf1d5649e51babf859ccc7)
@@ -1,18 +1,19 @@
-/**********************************************************************//**
- *
- *  Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
- *
- *  THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
- *  WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
- *
- *  @file DGInterface.h
- *
- *  @date 08-Apr-2020
- *  @author S. Nash
- *
- *  @brief DGInterface (dialysate generator) header file.
- *
- **************************************************************************/
+/**************************************************************************
+*
+* Copyright (c) 2019-2021 Diality Inc. - All Rights Reserved.
+*
+* THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+* WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+*
+* @file DGInterface.h
+*
+* @author (last) Sean Nash
+* @date (last) 01-Dec-2020
+*
+* @author (original) Sean
+* @date (original) 08-Apr-2020
+*
+***************************************************************************/
 
 #ifndef __DG_H__
 #define __DG_H__
@@ -31,8 +32,12 @@
 
 // ********** public definitions **********
 
-#define DRAIN_RESERVOIR_TO_VOLUME_ML        200                 ///< Drain reservoir to this volume (in mL) during treatment.
-#define FILL_RESERVOIR_TO_VOLUME_ML         1700                ///< Fill reservoir to this volume (in mL) during treatment.
+#define DRAIN_RESERVOIR_TO_VOLUME_ML        200                 ///< Drain reservoir to this volume (in mL) during treatment.
+#ifndef V1_5_SYSTEM
+#define FILL_RESERVOIR_TO_VOLUME_ML         1700                ///< Fill reservoir to this volume (in mL) during treatment.
+#else
+#define FILL_RESERVOIR_TO_VOLUME_ML         1300                ///< Fill reservoir to this volume (in mL) during treatment.
+#endif
 
 /// Enumeration of DG reservoirs.
 typedef enum DG_Reservoirs
@@ -52,6 +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 setPWMDutyCyclePct;
+} DG_RO_PUMP_DATA_PAYLOAD_T;
+
+/// Payload record structure for a drain pump data message.
+typedef struct
+{
+    U32 setPtRPM;
+    F32 setDAC;
+} 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 );