Index: firmware/App/HDCommon.h
===================================================================
diff -u -r5e77f78c5dee9dfb441bd5d2053f7f4ac50dc619 -rf3b83f75a19b975ad1abead662c8151a2907ac00
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 5e77f78c5dee9dfb441bd5d2053f7f4ac50dc619)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision f3b83f75a19b975ad1abead662c8151a2907ac00)
@@ -72,6 +72,43 @@
 
 // **** Common Definitions ****
 
+#pragma pack(push,1)
+
+/// Payload record structure for an HD versions message.
+typedef struct
+{
+    U08 major;
+    U08 minor;
+    U08 micro;
+    U16 build;
+    U08 fpgaId;
+    U08 fpgaMajor;
+    U08 fpgaMinor;
+    U08 fpgaLab;
+} HD_VERSIONS_T;
+
+/// Payload record structure for a peristaltic pump data message.
+typedef struct
+{
+    U32 setPoint;
+    F32 measFlow;
+    F32 measRotorSpd;
+    F32 measPumpSpd;
+    F32 measMCSpd;
+    F32 measMCCurr;
+    F32 pwmDC;
+} PERISTALTIC_PUMP_STATUS_PAYLOAD_T;
+
+/// Payload record structure for a pump set point override message.
+typedef struct
+{
+    BOOL reset;
+    S32 setPt;
+    U32 ctrlMode;
+} OVERRIDE_PUMP_SET_PT_PAYLOAD_T;
+
+#pragma pack(pop)
+
 // **** Common Macros ****
 
 /**@}*/