Index: HDDefs.h
===================================================================
diff -u -r72b160dc9bedcbe238a6282db18975a960e39776 -r56402afe56a74fe27f40abe9531b309d13722c91
--- HDDefs.h	(.../HDDefs.h)	(revision 72b160dc9bedcbe238a6282db18975a960e39776)
+++ HDDefs.h	(.../HDDefs.h)	(revision 56402afe56a74fe27f40abe9531b309d13722c91)
@@ -237,6 +237,65 @@
 };
 typedef enum UF_Adjustments UF_ADJ_T;
 
+/// Enumeration of treatment parameters.
+enum Treatment_Params
+{
+    TREATMENT_PARAM_BLOOD_FLOW = 0,                                     ///< Blood flow rate (in mL/min)
+    TREATMENT_PARAM_FIRST_UINT = TREATMENT_PARAM_BLOOD_FLOW,            ///< First unsigned integer treatment parameter
+    TREATMENT_PARAM_DIALYSATE_FLOW,                                     ///< Dialysate flow rate (in mL/min)
+    TREATMENT_PARAM_TREATMENT_DURATION,                                 ///< Treatment duration (in minutes)
+    TREATMENT_PARAM_HEPARIN_PRE_STOP_TIME,                              ///< Heparin pre-stop time (in minutes)
+    TREATMENT_PARAM_SALINE_BOLUS_VOLUME,                                ///< Saline bolus volume (in mL)
+    TREATMENT_PARAM_ACID_CONCENTRATE,                                   ///< Acid concentrate type (enum)
+    TREATMENT_PARAM_BICARB_CONCENTRATE,                                 ///< Bicarbonate concentrate type (enum)
+    TREATMENT_PARAM_DIALYZER_TYPE,                                      ///< Dialysate type (enum)
+    TREATMENT_PARAM_BP_MEAS_INTERVAL,                                   ///< Blood pressure measurement interval (in minutes)
+    TREATMENT_PARAM_RINSEBACK_FLOW_RATE,                                ///< Rinseback flow rate (in mL/min)
+    TREATMENT_PARAM_LAST_UINT = TREATMENT_PARAM_RINSEBACK_FLOW_RATE,    ///< Last unsigned integer treatment parameter
+    TREATMENT_PARAM_ART_PRESSURE_LOW_LIMIT,                             ///< Arterial pressure low alarm limit (in mmHg)
+    TREATMENT_PARAM_FIRST_INT = TREATMENT_PARAM_ART_PRESSURE_LOW_LIMIT, ///< First integer treatment parameter
+    TREATMENT_PARAM_ART_PRESSURE_HIGH_LIMIT,                            ///< Arterial pressure high alarm limit (in mmHg)
+    TREATMENT_PARAM_VEN_PRESSURE_LOW_LIMIT,                             ///< Venous pressure low alarm limit (in mmHg)
+    TREATMENT_PARAM_VEN_PRESSURE_HIGH_LIMIT,                            ///< Venous pressure high alarm limit (in mmHg)
+    TREATMENT_PARAM_LAST_INT = TREATMENT_PARAM_VEN_PRESSURE_HIGH_LIMIT, ///< Last integer treatment parameter
+    TREATMENT_PARAM_HEPARIN_DISPENSE_RATE,                              ///< Heparin dispense rate (in mL/hr)
+    TREATMENT_PARAM_FIRST_F32 = TREATMENT_PARAM_HEPARIN_DISPENSE_RATE,  ///< First floating point treatment parameter
+    TREATMENT_PARAM_HEPARIN_BOLUS_VOLUME,                               ///< Heparin bolus volume (in mL)
+    TREATMENT_PARAM_DIALYSATE_TEMPERATURE,                              ///< Dialysate temperature (in degC)
+    TREATMENT_PARAM_UF_VOLUME,                                          ///< Ultrafiltration volume (in liters) - provided separately by UI
+    NUM_OF_TREATMENT_PARAMS                                             ///< Total number of treatment parameters
+};
+typedef enum Treatment_Params TREATMENT_PARAM_T;
+
+/// Enumeration of dialyzer types.
+enum Dialyzer_Types
+{
+    DIALYZER_TYPE_NIPRO_ELISIO_H_17 = 0,                                ///< Nipro Elisio H17 dialyzer
+    DIALYZER_TYPE_NIPRO_ELISIO_H_19,                                    ///< Nipro Elisio H19 dialyzer
+    DIALYZER_TYPE_FRESENIUS_OPTIFLUX_F160NRE,                           ///< Fresenius Optiflux F160NRe
+    DIALYZER_TYPE_FRESENIUS_OPTIFLUX_F180NRE,                           ///< Fresenius Optiflux F180NRe
+    NUM_OF_DIALYZER_TYPES                                               ///< Number of dialyzer types
+};
+typedef enum Dialyzer_Types DIALYZER_TYPE_T;
+
+/// Enumeration of acid concentrates.
+enum Acid_Concentrates
+{
+    ACID_CONC_TYPE_FRESENIUS_08_1251_1 = 0,                             ///< Fresensius Naturalyte Acid Concentrate 08-1251-1
+    ACID_CONC_TYPE_FRESENIUS_08_2251_0,                                 ///< Fresensius Naturalyte Acid Concentrate 08-1251-1
+    ACID_CONC_TYPE_FRESENIUS_08_3251_9,                                 ///< Fresensius Naturalyte Acid Concentrate 08-1251-1
+    NUM_OF_ACID_CONC_TYPES                                              ///< Number of acid concentrates
+};
+typedef enum Acid_Concentrates ACID_CONCENTRATE_TYPE_T;
+
+/// Enumeration of bicarbonate concentrates.
+enum Bicarb_Concentrates
+{
+    BICARB_CONC_TYPE_FRESENIUS_CENTRISOL = 0,                           ///< Fresenius Centrisol Liquid Bicarbonate
+    NUM_OF_BICARB_CONC_TYPES                                            ///< Number of bicarbonate concentrates
+};
+typedef enum Bicarb_Concentrates BICARB_CONCENTRATE_TYPE_T;
+
 /**@}*/
 
 #endif
Index: MsgDefs.h
===================================================================
diff -u -r15e222c65e84303e75321b88622f29b99415ee9b -r56402afe56a74fe27f40abe9531b309d13722c91
--- MsgDefs.h	(.../MsgDefs.h)	(revision 15e222c65e84303e75321b88622f29b99415ee9b)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 56402afe56a74fe27f40abe9531b309d13722c91)
@@ -135,6 +135,7 @@
     MSG_ID_HD_ACCEL_SET_CALIBRATION = 0x802A,                           ///< HD accelerometer set calibration factors request
     MSG_ID_HD_BLOOD_FLOW_SET_CALIBRATION = 0x802B,                      ///< Blood flow set calibration factors request
     MSG_ID_HD_DIALYSATE_FLOW_SET_CALIBRATION = 0x802C,                  ///< Dialysate flow set calibration factors request
+    MSG_ID_HD_SET_PARAMETER_TREATMENT_PARAMETER = 0x802D,               ///< Set a treatment parameter (will change actual setting, not an override)
 
     MSG_ID_FIRST_DG_TESTER_MESSAGE = 0xA000,                            ///< First DG test message ID
     MSG_ID_DG_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_DG_TESTER_MESSAGE,    ///< DG tester log-in