Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r5c430c3ac17fc8ad836fd70b8a3b8a12af44319e -r6530db1926d689b51c2f5fcd6ae928c40ebf5f42
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 5c430c3ac17fc8ad836fd70b8a3b8a12af44319e)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 6530db1926d689b51c2f5fcd6ae928c40ebf5f42)
@@ -7,8 +7,8 @@
 *
 * @file    SystemCommMessages.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      02-Jan-2023
+* @author  (last)      Michael Garthwaite
+* @date    (last)      20-Mar-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -484,7 +484,7 @@
 
     // create a message record
     blankMessage( &msg );
-    msg.hdr.msgID = MSG_ID_DG_VERSION;
+    msg.hdr.msgID = MSG_ID_DG_VERSION_REPONSE;
     msg.hdr.payloadLen = sizeof( DG_VERSIONS_T );
 
     if ( message->hdr.payloadLen == sizeof( U08 ) + sizeof( U08 ) + sizeof( U08 ) + sizeof( U16 ) + sizeof( U32 ) )
@@ -502,7 +502,7 @@
     }
 
     // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
-    serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_BROADCAST, ACK_NOT_REQUIRED );
+    serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_BROADCAST, ACK_REQUIRED );
 }
 
 /*********************************************************************//**
@@ -526,7 +526,7 @@
 
     // Create a message record
     blankMessage( &msg );
-    msg.hdr.msgID = MSG_ID_DG_SERIAL_NUMBER;
+    msg.hdr.msgID = MSG_ID_DG_SERIAL_NUMBER_RESPONSE;
 
     // Add 1 byte for null terminator
     msg.hdr.payloadLen = MAX_TOP_LEVEL_SN_CHARS + 1;
@@ -1676,7 +1676,7 @@
     getCPLDStatus( &payload );
     // create a message record
     blankMessage( &msg );
-    msg.hdr.msgID = MSG_ID_DG_CPLD_STATUS;
+    msg.hdr.msgID = MSG_ID_DG_CPLD_STATUS_DATA;
     msg.hdr.payloadLen = sizeof( CPLD_STATUS_T );
 
     // fill message payload
@@ -4268,7 +4268,7 @@
         memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
         if ( FALSE == payload.reset )
         {
-            result = testSetIntegratedVolumeOverride( payload.state.u32 );
+            result = testSetIntegratedVolumeOverride( payload.state.f32 );
         }
         else
         {
@@ -4312,4 +4312,128 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleDGRTCControlReg1StatusOverrideRequest function handles a
+ * request to override RTC control register 1.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message : a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleDGRTCControlReg1StatusOverrideRequest( MESSAGE_T * message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // Verify payload length
+    if ( sizeof(TEST_OVERRIDE_PAYLOAD_T) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof(TEST_OVERRIDE_PAYLOAD_T) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetRTCCtlReg1Status( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetRTCCtlReg1Status();
+        }
+    }
+
+    // Respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleDGRTCControlReg1StatusOverrideRequest function handles a
+ * request to override RTC control register 3.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message : a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleDGRTCControlReg3StatusOverrideRequest( MESSAGE_T * message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // Verify payload length
+    if ( sizeof(TEST_OVERRIDE_PAYLOAD_T) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof(TEST_OVERRIDE_PAYLOAD_T) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetRTCCtlReg3Status( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetRTCCtlReg3Status();
+        }
+    }
+
+    // Respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
+#ifndef _RELEASE_
+/*********************************************************************//**
+ * @brief
+ * The handleTestDGNelsonDisinfectSupport function handles a request
+ * to set the Nelson disinfect support mode.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestDGNelsonDisinfectSupport( MESSAGE_T *message )
+{
+    U32 payload;
+    BOOL result = FALSE;
+
+    // verify payload length
+    if ( ( sizeof( U32 ) == message->hdr.payloadLen ) &&
+         ( ( DG_MODE_STAN == getCurrentOperationMode() ) || ( DG_MODE_SOLO == getCurrentOperationMode() ) ) )
+    {
+        NELSON_SUPPORT_T nelson;
+
+        memcpy( &payload, message->payload, sizeof( U32 ) );
+
+        nelson = (NELSON_SUPPORT_T)payload;
+        result = TRUE;
+
+        switch( nelson )
+        {
+            case NELSON_INOCULATE:
+                setHeatNelsonSupportMode( nelson );
+                requestNewOperationMode( DG_MODE_HEAT );
+                break;
+
+            case NELSON_HEAT_DISINFECT:
+                setHeatNelsonSupportMode( nelson );
+                requestNewOperationMode( DG_MODE_HEAT );
+                break;
+
+            case NELSON_POS_CONTROL_HEAT_DISINFECT:
+                setHeatNelsonSupportMode( nelson );
+                requestNewOperationMode( DG_MODE_HEAT );
+                break;
+
+            case NELSON_CHEM_DISINFECT:
+                setChemNelsonSupportMode( nelson );
+                requestNewOperationMode( DG_MODE_CHEM );
+                break;
+
+            case NELSON_DRAIN_SAMPLES:
+                setHeatNelsonSupportMode( nelson );
+                requestNewOperationMode( DG_MODE_HEAT );
+                break;
+        }
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+#endif
+
 /**@}*/