Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -rbd738c0705e8640d2c532ecece876aaa3496ee32 -ra19a676d1e67bb3e1aca9e9bba49727f9d5f8b38
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision bd738c0705e8640d2c532ecece876aaa3496ee32)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision a19a676d1e67bb3e1aca9e9bba49727f9d5f8b38)
@@ -26,11 +26,17 @@
 
 // ********** private definitions **********
 
+#define START_DG_CMD        TRUE
+#define STOP_DG_CMD         FALSE
 
 // ********** private data **********
 
-// DG mode
+// DG status
 static DG_OP_MODE_T dgCurrentOpMode = DG_MODE_INIT;
+static BOOL dgStarted = FALSE;
+static BOOL dgStartetSet = FALSE;
+static BOOL dgWaterSampled = FALSE;
+static BOOL dgWaterSampledSet = FALSE;
 
 // DG sensor data
 static F32 dgPressures[ NUM_OF_DG_PRESSURE_SENSORS ];
@@ -204,7 +210,7 @@
  * @param drainVol : Reservoir drain to volume reported by DG.
  * @return none
  *************************************************************************/
-void setDGReservoirsData( U32 resID, U32 fillVol, U32 drainVol )
+void setDGReservoirsData( DG_RESERVOIR_ID_T resID, U32 fillVol, U32 drainVol )
 {
     if ( resID < NUM_OF_DG_RESERVOIRS )
     {
@@ -275,11 +281,11 @@
  * @param trimmerHtrTemp : commanded target dialysate temperature for the trimmer heater.
  * @return none
  *************************************************************************/
-void cmdSetDGDialysateTargetTemps( U32 primaryHtrTemp, U32 trimmerHtrTemp )
+void cmdSetDGDialysateTargetTemps( F32 primaryHtrTemp, F32 trimmerHtrTemp )
 {
     dgPrimaryTempSet = primaryHtrTemp;
     dgTrimmerTempSet = trimmerHtrTemp;
-    // TODO - send command to DG
+    sendDialysateTempTargetsToDG( primaryHtrTemp, trimmerHtrTemp );
 }
 
 /*********************************************************************//**
@@ -293,7 +299,8 @@
  *************************************************************************/
 void cmdStartDG( void )
 {
-    // TODO - send command to DG
+    dgStarted = TRUE;
+    sendDGStartStopCommand( START_DG_CMD );
 }
 
 /*********************************************************************//**
@@ -307,7 +314,8 @@
  *************************************************************************/
 void cmdStopDG( void )
 {
-    // TODO - send command to DG
+    dgStarted = FALSE;
+    sendDGStartStopCommand( STOP_DG_CMD );
 }
 
 /*********************************************************************//**
@@ -325,7 +333,7 @@
     if ( resID < NUM_OF_DG_RESERVOIRS )
     {
         dgActiveReservoirSet = resID;
-        // TODO - send command to DG
+        sendDGSwitchReservoirCommand( resID );
     }
     else
     {
@@ -345,7 +353,7 @@
 void cmdStartDGFill( U32 fillToVolMl )
 {
     dgReservoirFillVolumeTargetSet = fillToVolMl;
-    // TODO - send command to DG
+    sendDGFillCommand( fillToVolMl );
 }
 
 /*********************************************************************//**
@@ -360,7 +368,21 @@
 void cmdStartDGDrain( U32 drainToVolMl )
 {
     dgReservoirDrainVolumeTargetSet = drainToVolMl;
-    // TODO - send command to DG
+    sendDGDrainCommand( drainToVolMl );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The cmdDGSampleWater function sends a sample water command message to the DG.
+ * @details
+ * Inputs : none
+ * Outputs : sample water command sent to DG.
+ * @return none
+ *************************************************************************/
+void cmdDGSampleWater( void )
+{
+    dgWaterSampled = TRUE;
+    sendDGSampleWaterCommand();
+}
+
 /**@}*/
Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -rbd738c0705e8640d2c532ecece876aaa3496ee32 -ra19a676d1e67bb3e1aca9e9bba49727f9d5f8b38
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision bd738c0705e8640d2c532ecece876aaa3496ee32)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision a19a676d1e67bb3e1aca9e9bba49727f9d5f8b38)
@@ -79,17 +79,18 @@
 
 void setDGOpMode( U32 opMode );
 void setDGDialysateTemperatures( F32 primaryHtrTemp, F32 trimmerHtrTemp );
-void setDGReservoirsData( U32 resID, U32 fillVol, U32 drainVol );
+void setDGReservoirsData( DG_RESERVOIR_ID_T resID, U32 fillVol, U32 drainVol );
 void setDGPressures( F32 roIn, F32 roOut, F32 drainIn, F32 drainOut );
 void setDGROPumpData( U32 presSetPt, F32 flowRate );
 void setDGDrainPumpData( U32 rpmSetPt );
 
-void cmdSetDGDialysateTargetTemps( U32 primaryHtrTemp, U32 trimmerHtrTemp );
+void cmdSetDGDialysateTargetTemps( F32 primaryHtrTemp, F32 trimmerHtrTemp );
 void cmdStartDG( void );
 void cmdStopDG( void );
 void cmdSetDGActiveReservoir( DG_RESERVOIR_ID_T resID );
 void cmdStartDGFill( U32 fillToVolMl );
 void cmdStartDGDrain( U32 drainToVolMl );
+void cmdDGSampleWater( void );
 
 /**@}*/
 
Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r9b262ba08e3180f121c3cf19d8d25e565183f87d -ra19a676d1e67bb3e1aca9e9bba49727f9d5f8b38
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 9b262ba08e3180f121c3cf19d8d25e565183f87d)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision a19a676d1e67bb3e1aca9e9bba49727f9d5f8b38)
@@ -81,6 +81,7 @@
 
     if ( TRUE == stop )
     {
+        cmdStartDG();
         requestNewOperationMode( MODE_PRES );
     }
 #ifdef RM46_EVAL_BOARD_TARGET
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rbbea4a2a607ed759bc283c75623c0e3f9a8c066c -ra19a676d1e67bb3e1aca9e9bba49727f9d5f8b38
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision bbea4a2a607ed759bc283c75623c0e3f9a8c066c)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision a19a676d1e67bb3e1aca9e9bba49727f9d5f8b38)
@@ -118,7 +118,7 @@
 
 typedef struct
 {
-    U32 resID;
+    DG_RESERVOIR_ID_T resID;
     U32 setFillToVolumeMl;
     U32 setDrainToVolumeMl;
 } DG_RESERVOIRS_DATA_PAYLOAD_T;
@@ -522,6 +522,147 @@
 }
 
 /*************************************************************************
+ * @brief
+ * The sendDGSwitchReservoirCommand function constructs a DG set active \n
+ * reservoir message for DG and queues the msg for transmit on the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : DG set active reservoir msg constructed and queued.
+ * @param activeReservoir : reservoir ID to set as active.
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGSwitchReservoirCommand( DG_RESERVOIR_ID_T activeReservoir )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_SWITCH_RESERVOIR_CMD;
+    msg.hdr.payloadLen = sizeof( DG_RESERVOIR_ID_T );
+
+    memcpy( payloadPtr, &activeReservoir, sizeof( DG_RESERVOIR_ID_T ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+
+    return result;
+}
+
+/*************************************************************************
+ * @brief
+ * The sendDGFillCommand function constructs a DG fill command message \n
+ * and queues the msg for transmit on the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : DG fill command msg constructed and queued.
+ * @param fillToVolumeMl : volume (in mL) to fill inactive reservoir to.
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGFillCommand( U32 fillToVolumeMl )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_FILL_CMD;
+    msg.hdr.payloadLen = sizeof( U32 );
+
+    memcpy( payloadPtr, &fillToVolumeMl, sizeof( U32 ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+
+    return result;
+}
+
+/*************************************************************************
+ * @brief
+ * The sendDGDrainCommand function constructs a DG drain command message \n
+ * and queues the msg for transmit on the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : DG drain command msg constructed and queued.
+ * @param drainToVolumeMl : volume (in mL) to drain the inactive reservoir to.
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGDrainCommand( U32 drainToVolumeMl )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_DRAIN_CMD;
+    msg.hdr.payloadLen = sizeof( U32 );
+
+    memcpy( payloadPtr, &drainToVolumeMl, sizeof( U32 ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+
+    return result;
+}
+
+/*************************************************************************
+ * @brief
+ * The sendDGStartStopCommand function constructs a DG start/stop command \n
+ * message and queues the msg for transmit on the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : DG start/stop command msg constructed and queued.
+ * @param start : TRUE indicates start DG, FALSE indicates stop DG.
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGStartStopCommand( BOOL start )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_STARTING_STOPPING_TREATMENT_CMD;
+    msg.hdr.payloadLen = sizeof( BOOL );
+
+    memcpy( payloadPtr, &start, sizeof( BOOL ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+
+    return result;
+}
+
+/*************************************************************************
+ * @brief
+ * The sendDGSampleWaterCommand function constructs a DG sample water command \n
+ * message and queues the msg for transmit on the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : DG sample water command msg constructed and queued.
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGSampleWaterCommand( void )
+{
+    BOOL result;
+    MESSAGE_T msg;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_SAMPLE_WATER_CMD;
+    msg.hdr.payloadLen = 0;
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_DG, ACK_REQUIRED );
+
+    return result;
+}
+
+/*************************************************************************
  * @brief broadcastAlarmStatus
  * The broadcastAlarmStatus function constructs an alarm status msg to \n
  * be broadcast and queues the msg for transmit on the appropriate CAN channel.
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -ra4c13a58e281ff7a626a58317bc8a280df7e516e -ra19a676d1e67bb3e1aca9e9bba49727f9d5f8b38
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision a4c13a58e281ff7a626a58317bc8a280df7e516e)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision a19a676d1e67bb3e1aca9e9bba49727f9d5f8b38)
@@ -20,6 +20,7 @@
 #include "HDCommon.h"
 #include "MsgQueues.h"
 #include "DialOutFlow.h"
+#include "DGInterface.h"
 
 // ********** public definitions **********
 
@@ -80,6 +81,21 @@
 // MSG_ID_SET_DG_DIALYSATE_TEMP_TARGETS
 BOOL sendDialysateTempTargetsToDG( F32 primary, F32 trimmer );
 
+// MSG_ID_DG_SWITCH_RESERVOIR_CMD
+BOOL sendDGSwitchReservoirCommand( DG_RESERVOIR_ID_T activeReservoir );
+
+// MSG_ID_DG_FILL_CMD
+BOOL sendDGFillCommand( U32 fillToVolumeMl );
+
+// MSG_ID_DG_DRAIN_CMD
+BOOL sendDGDrainCommand( U32 drainToVolumeMl );
+
+// MSG_ID_STARTING_STOPPING_TREATMENT_CMD
+BOOL sendDGStartStopCommand( BOOL start );
+
+// MSG_ID_DG_SAMPLE_WATER_CMD
+BOOL sendDGSampleWaterCommand( void );
+
 // MSG_ID_DG_OP_MODE:
 void handleDGOpMode( MESSAGE_T *message );