Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -redea658600106142cef72c6bb60825ca90c9c80b -r60b542afe2cbee262e3e5ae48964aa8b4c9c8399
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision edea658600106142cef72c6bb60825ca90c9c80b)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 60b542afe2cbee262e3e5ae48964aa8b4c9c8399)
@@ -223,13 +223,23 @@
     // if CAN transmitter is idle, start transmitting any pending packets
     if ( FALSE == isCAN1TransmitInProgress() )
     {
-        transmitNextCANPacket();
+        U32 bytesXmitted = transmitNextCANPacket();
+
+        if ( bytesXmitted > 0 )
+        {
+            signalCANXmitsInitiated();
+        }
     }
 
     // if UART transmitter is idle, start transmitting any pending packets
     if ( FALSE == isSCI1DMATransmitInProgress() )
     {
-        transmitNextUARTPacket();
+        U32 bytesXmitted = transmitNextUARTPacket();
+
+        if ( bytesXmitted > 0 )
+        {
+            signalSCI1XmitsInitiated();
+        }
     }
 }