Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r47a7da55aea88cd7a2b06870226122d0cc8be540 -ra60ec05d359c0d3f014015e9080b6dbcef0fea28
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 47a7da55aea88cd7a2b06870226122d0cc8be540)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision a60ec05d359c0d3f014015e9080b6dbcef0fea28)
@@ -92,7 +92,11 @@
  *************************************************************************/
 U32 execStandbyMode( void )
 {
-    BOOL stop = isStopButtonPressed();
+#ifdef EMC_TEST_BUILD
+    static BOOL toggle = FALSE;
+    static BOOL button_state = FALSE;
+#endif
+BOOL stop = isStopButtonPressed();
     DG_OP_MODE_T dgOpMode = getDGOpMode();  // TODO - the DG mode & sub-mode come as a pair at interval - they MUST be kept together.
     U32 dgSubMode = getDGSubMode();
 
@@ -202,8 +206,30 @@
             // TODO - test code
             if ( TRUE == stop )
             {
+#ifdef EMC_TEST_BUILD
+                if ( stop != button_state )
+                {
+                    toggle = ( toggle == TRUE ? FALSE : TRUE );
+                    if ( TRUE == toggle )
+                    {
+                        setBloodPumpTargetFlowRate( 500, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                        setDialInPumpTargetFlowRate( 500, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                        setDialOutPumpTargetRate( 500, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                    }
+                    else
+                    {
+                        setBloodPumpTargetFlowRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                        setDialInPumpTargetFlowRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                        setDialOutPumpTargetRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                    }
+                }
+#else
                 requestNewOperationMode( MODE_TPAR );
+#endif
             }
+#ifdef EMC_TEST_BUILD
+            button_state = stop;
+#endif
             break;
 
         default: