Index: firmware/App/Modes/ModePreGenDialysate.c
===================================================================
diff -u -rf6022e86136c821709ce24b61e11e8e2bdf0b11e -r88f86f2dc5107670e32f53e04e256ad8249ba55f
--- firmware/App/Modes/ModePreGenDialysate.c	(.../ModePreGenDialysate.c)	(revision f6022e86136c821709ce24b61e11e8e2bdf0b11e)
+++ firmware/App/Modes/ModePreGenDialysate.c	(.../ModePreGenDialysate.c)	(revision 88f86f2dc5107670e32f53e04e256ad8249ba55f)
@@ -386,6 +386,8 @@
 {
     DD_WET_SELF_TEST_STATE_T state  = DD_WET_SELF_TEST_NEGATIVE_DEAERATION_PRES_CHECK;
     F32 hydPressure                 = getFilteredPressure( D9_PRES );
+    // For Degassing close loop pump control, the calculated negative pressure added up with pressure adjustment factor
+    // to drive more negative pressure.Remove the pressure adjustment factor for actual pressure check.
     F32 targetPressure              = getDialysatePumpTargetPressure( D12_PUMP ) - DEGAS_PUMP_TARGET_PRES_ADJ_THRESHOLD;
 
     if ( hydPressure <= targetPressure )
Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -r9ff57b5ab7490ee5bbc2c51b25f738ee6c569ec1 -r88f86f2dc5107670e32f53e04e256ad8249ba55f
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 9ff57b5ab7490ee5bbc2c51b25f738ee6c569ec1)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 88f86f2dc5107670e32f53e04e256ad8249ba55f)
@@ -156,6 +156,7 @@
     MSG_ID_DD_PRE_GEN_DIALYSATE_REQUEST_DATA,
     MSG_ID_DD_STOP_PRE_GEN_DIALYSATE_MODE_OVERRIDE_REQUEST,
     MSG_ID_DD_STOP_GEN_DIALYSATE_MODE_OVERRIDE_REQUEST,
+    MSG_ID_FW_VERSIONS_REQUEST,
 #ifdef __PUMPTEST__
     MSG_ID_DD_PISTON_PUMP_DATA_PUBLISH_OVERRIDE_REQUEST,
     MSG_ID_DD_PISTON_PUMP_START_STOP_OVERRIDE_REQUEST,
@@ -233,6 +234,7 @@
     &handlePreGenDialysateRequestMsg,
     &testDDStopPreGenDialysateOverride,
     &testDDStopGenDialysateOverride,
+    &handleVersionRequestMessage,
 #ifdef __PUMPTEST__
     &testDDPistonPumpControlDataPublishIntervalOverride,
     &testDDPistonPumpStartStopOverride,
@@ -668,15 +670,15 @@
         // Record UI version information
         memcpy( (U08*)(&uiVersionRecord), &message->payload, sizeof( UI_VERSIONS_T ) );
 
-        // Build TD version record
+        // Build DD version record
         ddVersionRecord.major            = DD_VERSION_MAJOR;
         ddVersionRecord.minor            = DD_VERSION_MINOR;
         ddVersionRecord.micro            = DD_VERSION_MICRO;
         ddVersionRecord.build            = DD_VERSION_BUILD;
         getFPGAVersions( &ddVersionRecord.fpgaId, &ddVersionRecord.fpgaMajor, &ddVersionRecord.fpgaMinor, &ddVersionRecord.fpgaLab );
         ddVersionRecord.compatibilityRev = SW_COMPATIBILITY_REV;
 
-        // Send TD version information
+        // Send DD version information
         result = sendMessage( MSG_ID_DD_VERSION_REPONSE, COMM_BUFFER_OUT_CAN_DD_BROADCAST, (U08*)&ddVersionRecord, sizeof( DD_VERSIONS_T ) );
     }
 
Index: firmware/App/Services/Messaging.h
===================================================================
diff -u -r6679a2cd813b21a8cb4c58b3eeb721e0eef9a10b -r88f86f2dc5107670e32f53e04e256ad8249ba55f
--- firmware/App/Services/Messaging.h	(.../Messaging.h)	(revision 6679a2cd813b21a8cb4c58b3eeb721e0eef9a10b)
+++ firmware/App/Services/Messaging.h	(.../Messaging.h)	(revision 88f86f2dc5107670e32f53e04e256ad8249ba55f)
@@ -67,6 +67,7 @@
 // handler functions ****************************************
 
 BOOL handleSetTDOperationMode( MESSAGE_T *message );
+BOOL handleVersionRequestMessage( MESSAGE_T *message );
 
 // Test Support Messaging Functions **************************
 
Index: firmware/App/Services/ROInterface.c
===================================================================
diff -u -r9102c5da21a15bdaf4bb3bc38795ceb064e3c443 -r88f86f2dc5107670e32f53e04e256ad8249ba55f
--- firmware/App/Services/ROInterface.c	(.../ROInterface.c)	(revision 9102c5da21a15bdaf4bb3bc38795ceb064e3c443)
+++ firmware/App/Services/ROInterface.c	(.../ROInterface.c)	(revision 88f86f2dc5107670e32f53e04e256ad8249ba55f)
@@ -41,6 +41,7 @@
 static RO_OP_MODE_T roCurrentOpMode;                                        ///< Current TD operation mode.
 static U32  roSubMode;                                                      ///< Current state (sub-mode) of current TD operation mode.
 static F32  roFlowRate;                                                     ///< RO flow rate
+static RO_CMD_ID cmdID;                                                     ///< RO mode ( Pregen or Gen Water)
 
 static BOOL roOpModeDataFreshFlag = FALSE;                                  ///< Flag to signal/process fresh RO op mode data
 
@@ -61,6 +62,7 @@
     roCurrentOpMode         = RO_MODE_INIT;
     roSubMode               = 0;
     roFlowRate              = MAX_RO_FLOW_RATE;
+    cmdID                   = RO_PRE_GEN;
 }
 
 /**********************************************************************//**
@@ -111,8 +113,8 @@
 
 /*********************************************************************//**
  * @brief
- * The cmdROStartStop function sends a start/stop command to RO to deliver
- * purified water and required flow rate.
+ * The cmdROStartStop function sends a start/stop command to RO for mode
+ * transition and generate water with commanded flow rate.
  * @details Inputs: none
  * @details Outputs: start/stop command along with flow rate if applicable.
  * @param startStop To start/stop the RO delivery.
@@ -126,6 +128,7 @@
     U08 *payloadPtr = msg.payload;
 
     // Populate RO start message
+    roStartRequest.cmdID    = (U32)getROModeCmd();
     roStartRequest.start    = startStop;
     roStartRequest.roRate   = getROFlowRate();
 
@@ -169,6 +172,32 @@
 
 /*********************************************************************//**
  * @brief
+ * The setROModeCmd function sets RO operation mode to be transitioned when
+ * start/stop request sent from DD .
+ * @details \b Inputs: none
+ * @details \b Outputs: cmdID
+ * @param cmdMode RO Operation mode change
+ * @return none.
+ *************************************************************************/
+void setROModeCmd( RO_CMD_ID cmdMode )
+{
+    cmdID = cmdMode;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The getROModeCmd function gets the last set RO mode for transition request.
+ * @details \b Inputs: RO Operation mode change command
+ * @details \b Outputs: none
+ * @return latest RO Mode change command.
+ *************************************************************************/
+RO_CMD_ID getROModeCmd( void )
+{
+    return cmdID;
+}
+
+/*********************************************************************//**
+ * @brief
  * The getROOpMode function gets the current latest reported RO operating mode.
  * @details \b Inputs: roCurrentOpMode
  * @details \b Outputs: none
Index: firmware/App/Services/ROInterface.h
===================================================================
diff -u -r9102c5da21a15bdaf4bb3bc38795ceb064e3c443 -r88f86f2dc5107670e32f53e04e256ad8249ba55f
--- firmware/App/Services/ROInterface.h	(.../ROInterface.h)	(revision 9102c5da21a15bdaf4bb3bc38795ceb064e3c443)
+++ firmware/App/Services/ROInterface.h	(.../ROInterface.h)	(revision 88f86f2dc5107670e32f53e04e256ad8249ba55f)
@@ -19,6 +19,7 @@
 #define __RO_INTERFACE_H__
 
 #include "DDCommon.h"
+#include "MessagePayloads.h"
 #include "TDDefs.h"
 #include "RODefs.h"
 
@@ -43,6 +44,8 @@
 BOOL cmdROStartStop( BOOL startStop);
 void setROFlowRate( F32 roFlow );
 F32 getROFlowRate( void );
+void setROModeCmd( RO_CMD_ID cmdMode );
+RO_CMD_ID getROModeCmd( void );
 
 void setROOpMode( U32 opMode, U32 subMode );
 RO_OP_MODE_T      getROOpMode( void );
Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -r6e36d2fd90b130f540494f4128951d81e7dc5ed5 -r88f86f2dc5107670e32f53e04e256ad8249ba55f
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 6e36d2fd90b130f540494f4128951d81e7dc5ed5)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 88f86f2dc5107670e32f53e04e256ad8249ba55f)
@@ -345,8 +345,12 @@
         // Process the pre-gen dialysate delivery request message
         if ( ( DD_MODE_STAN == ddMode ) && ( TRUE == startPreGenRequest.start ) )
         {
-            // start dialysate generation
+            // start pre-gen dialysate
             result = requestDDPreGenStart();
+            // Update Temperature, Acid/Bicarb type and dialysate rate for pregen process.
+            setTDDialysateFlowrate( startPreGenRequest.dialRate );
+            setTDTargetDialysateTemperature( startPreGenRequest.dialTemp );
+            setTDAcidAndBicarbType( startPreGenRequest.acidType, startPreGenRequest.bicarbType );
         }
         else if ( DD_MODE_PREG == ddMode )
         {