Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rc672f41061bcd500d6593655641cb27ce3ae58fc -r85ab84d9a0668e1e3976b00eb29e79c38c81b651
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision c672f41061bcd500d6593655641cb27ce3ae58fc)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 85ab84d9a0668e1e3976b00eb29e79c38c81b651)
@@ -566,10 +566,12 @@
  * and queues the msg for transmit on the appropriate CAN channel.
  * @details Inputs: none
  * @details Outputs: DG drain command msg constructed and queued.
- * @param drainToVolumeMl volume (in mL) to drain the inactive reservoir to
+ * @param drainToVolumeMl volume (in mL) to drain the inactive reservoir to
+ * @param tareLoadCells set to TRUE if inactive reservoir load cells should be
+ * tared after draining
  * @return TRUE if msg successfully queued for transmit, FALSE if not
  *************************************************************************/
-BOOL sendDGDrainCommand( U32 drainToVolumeMl )
+BOOL sendDGDrainCommand( DRAIN_RESERVOIR_CMD_PAYLOAD_T *payload )
 {
     BOOL result;
     MESSAGE_T msg;
@@ -578,9 +580,9 @@
     // create a message record
     blankMessage( &msg );
     msg.hdr.msgID = MSG_ID_DG_DRAIN_CMD;
-    msg.hdr.payloadLen = sizeof( U32 );
+    msg.hdr.payloadLen = sizeof( DRAIN_RESERVOIR_CMD_PAYLOAD_T );
 
-    memcpy( payloadPtr, &drainToVolumeMl, sizeof( U32 ) );
+    memcpy( payloadPtr, payload, sizeof( DRAIN_RESERVOIR_CMD_PAYLOAD_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 );