Index: firmware/App/Drivers/ConductivitySensors.c
===================================================================
diff -u -red39129abdca4ec343369d83494530b23621e052 -ra9983d3e6b07e7c927fab3d16e80b715594fe221
--- firmware/App/Drivers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision ed39129abdca4ec343369d83494530b23621e052)
+++ firmware/App/Drivers/ConductivitySensors.c	(.../ConductivitySensors.c)	(revision a9983d3e6b07e7c927fab3d16e80b715594fe221)
@@ -143,6 +143,7 @@
     initFPGAPersistentAlarm( FPGA_PERS_ERROR_D27_COND_SENSOR, ALARM_ID_DD_D27_COND_SENSOR_FPGA_FAULT, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS );
     initFPGAPersistentAlarm( FPGA_PERS_ERROR_D29_COND_SENSOR, ALARM_ID_DD_D29_COND_SENSOR_FPGA_FAULT, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS );
     initFPGAPersistentAlarm( FPGA_PERS_ERROR_D43_COND_SENSOR, ALARM_ID_DD_D43_COND_SENSOR_FPGA_FAULT, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS );
+    initFPGAPersistentAlarm( FPGA_PERS_ERROR_D74_COND_SENSOR, ALARM_ID_DD_D74_COND_SENSOR_FPGA_FAULT, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS, COND_SENSORS_FPGA_ERROR_TIMEOUT_MS );
 }
 
 /*********************************************************************//**
@@ -165,23 +166,27 @@
     currentConductivityReadings[ D27_COND ].data = (F32)getFPGAD27Cond();
     currentConductivityReadings[ D29_COND ].data = (F32)getFPGAD29Cond();
     currentConductivityReadings[ D43_COND ].data = (F32)getFPGAD43Cond();
+    currentConductivityReadings[ D74_COND ].data = (F32)getFPGAD74Cond();
 
     // Read temperature associated to conductivity sensor
     currentTemperatureReadings[ D17_COND ].data = (F32)getFPGAD17CondTemp();
     currentTemperatureReadings[ D27_COND ].data = (F32)getFPGAD27CondTemp();
     currentTemperatureReadings[ D29_COND ].data = (F32)getFPGAD29CondTemp();
     currentTemperatureReadings[ D43_COND ].data = (F32)getFPGAD43CondTemp();
+    currentTemperatureReadings[ D74_COND ].data = (F32)getFPGAD74CondTemp();
 
     // Update read and error counters for each conductivity sensor
     lastConductivityReadCounter[ D17_COND ].data = (U32)getFPGAD17CondReadCount();
     lastConductivityReadCounter[ D27_COND ].data = (U32)getFPGAD27CondReadCount();
     lastConductivityReadCounter[ D29_COND ].data = (U32)getFPGAD29CondReadCount();
     lastConductivityReadCounter[ D43_COND ].data = (U32)getFPGAD43CondReadCount();
+    lastConductivityReadCounter[ D74_COND ].data = (U32)getFPGAD74CondReadCount();
 
     lastConductivityErrorCounter[ D17_COND ].data = (U32)getFPGAD17CondErrorCount();
     lastConductivityErrorCounter[ D27_COND ].data = (U32)getFPGAD27CondErrorCount();
     lastConductivityErrorCounter[ D29_COND ].data = (U32)getFPGAD29CondErrorCount();
     lastConductivityErrorCounter[ D43_COND ].data = (U32)getFPGAD43CondErrorCount();
+    lastConductivityErrorCounter[ D74_COND ].data = (U32)getFPGAD74CondErrorCount();
 
     // Monitor conductivity sensor health
     checkConductivitySensors();
@@ -199,6 +204,8 @@
  * D29 conductivity sensor is not able to be read.
  * @details \b Alarm: ALARM_ID_DD_D43_COND_SENSOR_FPGA_FAULT if the
  * D43 conductivity sensor is not able to be read.
+ * @details \b Alarm: ALARM_ID_DD_D74_COND_SENSOR_FPGA_FAULT if the
+ * D74 conductivity sensor is not able to be read.
  * @details \b Inputs: lastConductivityReadCounter, lastConductivityErrorCounter
  * @details \b Outputs: none
  * @return none
@@ -209,11 +216,13 @@
     checkFPGAPersistentAlarms( FPGA_PERS_ERROR_D27_COND_SENSOR, getConductivitySensorReadCount(D27_COND) );
     checkFPGAPersistentAlarms( FPGA_PERS_ERROR_D29_COND_SENSOR, getConductivitySensorReadCount(D29_COND) );
     checkFPGAPersistentAlarms( FPGA_PERS_ERROR_D43_COND_SENSOR, getConductivitySensorReadCount(D43_COND) );
+    checkFPGAPersistentAlarms( FPGA_PERS_ERROR_D74_COND_SENSOR, getConductivitySensorReadCount(D74_COND) );
 
     checkFPGAPersistentErrorCountAlarm( FPGA_PERS_ERROR_D17_COND_SENSOR, getConductivitySensorErrorCount( D17_COND ) );
     checkFPGAPersistentErrorCountAlarm( FPGA_PERS_ERROR_D27_COND_SENSOR, getConductivitySensorErrorCount( D27_COND ) );
     checkFPGAPersistentErrorCountAlarm( FPGA_PERS_ERROR_D27_COND_SENSOR, getConductivitySensorErrorCount( D29_COND ) );
     checkFPGAPersistentErrorCountAlarm( FPGA_PERS_ERROR_D43_COND_SENSOR, getConductivitySensorErrorCount( D43_COND ) );
+    checkFPGAPersistentErrorCountAlarm( FPGA_PERS_ERROR_D74_COND_SENSOR, getConductivitySensorErrorCount( D74_COND ) );
 }
 
 /*********************************************************************//**
@@ -515,6 +524,18 @@
         // clear D43 reset
         clearFPGAD43CondReset();
     }
+
+    if ( TRUE == conductivitySensorControl[ D74_COND ].resetRequested )
+    {
+        // D74 reset
+        setFPGAD74CondReset();
+        conductivitySensorControl[ D74_COND ].resetRequested = FALSE;
+    }
+    else
+    {
+        // clear D74 reset
+        clearFPGAD74CondReset();
+    }
 }
 
 /*********************************************************************//**
@@ -577,6 +598,18 @@
         // clear D43 Init command
         clearFPGAD43CondInitEnable();
     }
+
+    if ( TRUE == conductivitySensorControl[ D74_COND ].initEnable )
+    {
+        // D74 initialization
+        setFPGAD74CondInitEnable();
+        conductivitySensorControl[ D74_COND ].initEnable = FALSE;
+    }
+    else
+    {
+        // clear D74 Init command
+        clearFPGAD74CondInitEnable();
+    }
 }
 
 /*********************************************************************//**
@@ -674,6 +707,18 @@
         state = CONDUCTIVITY_WRITE_COMPLETE;
     }
 
+    if ( TRUE  == conductivitySensorControl[ D74_COND ].writeEnable &&
+         FALSE == conductivitySensorControl[ D74_COND ].writeInProgress )
+    {
+        // D74 write request
+        conductivitySensorControl[ D74_COND ].writeComplete = FALSE;
+        conductivitySensorControl[ D74_COND ].writeInProgress = TRUE;
+        setFPGACD5Address( conductivitySensorControl[ D74_COND ].writeAddress );
+        setFPGACD5Data( conductivitySensorControl[ D74_COND ].writeData );
+        setFPGAD74CondWriteEnable();
+        state = CONDUCTIVITY_WRITE_COMPLETE;
+    }
+
     return state;
 }
 
@@ -721,6 +766,13 @@
         state = CONDUCTIVITY_WRITE_INITIATE;
     }
 
+    if ( TRUE == conductivitySensorControl[ D74_COND ].writeInProgress )
+    {
+        conductivitySensorControl[ D74_COND ].writeComplete = TRUE;
+        conductivitySensorControl[ D74_COND ].writeEnable = FALSE;
+        clearFPGAD74CondWriteEnable();
+        state = CONDUCTIVITY_WRITE_INITIATE;
+    }
     return state;
 }
 
@@ -815,6 +867,17 @@
         state = CONDUCTIVITY_READ_COMPLETE;
     }
 
+    if ( TRUE  == conductivitySensorControl[ D74_COND ].readEnable &&
+         FALSE == conductivitySensorControl[ D74_COND ].readInProgress )
+    {
+        // D74 read request
+        conductivitySensorControl[ D74_COND ].readComplete = FALSE;
+        conductivitySensorControl[ D74_COND ].readInProgress = TRUE;
+        setFPGACD5Address( conductivitySensorControl[ D74_COND ].readAddress );
+        setFPGAD74CondReadEnable();
+        state = CONDUCTIVITY_READ_COMPLETE;
+    }
+
     return state;
 }
 
@@ -866,6 +929,15 @@
         state = CONDUCTIVITY_READ_INITIATE;
     }
 
+    if ( TRUE == conductivitySensorControl[ D74_COND ].readInProgress )
+    {
+        conductivitySensorControl[ D74_COND ].readData = getFPGAD74CondData();
+        conductivitySensorControl[ D74_COND ].readComplete = TRUE;
+        conductivitySensorControl[ D74_COND ].readEnable = FALSE;
+        clearFPGAD74CondReadEnable();
+        state = CONDUCTIVITY_READ_INITIATE;
+    }
+
     return state;
 }