Index: leahi_dialin/common/msg_ids.py
===================================================================
diff -u -r2f5eb156493bb326016ef7b921d1b05debfc5f3b -r8bcac0e6e7960de5d9bdf925bbf5581cdc97df31
--- leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 2f5eb156493bb326016ef7b921d1b05debfc5f3b)
+++ leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 8bcac0e6e7960de5d9bdf925bbf5581cdc97df31)
@@ -202,6 +202,7 @@
     MSG_ID_TD_BARO_PRESSURE_OVERRIDE = 0x8041
     MSG_ID_TD_TEMPERATURE_OVERRIDE = 0x8042
     MSG_ID_TD_TEMPERATURE_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0x8043
+    MSG_ID_TD_EJECTOR_OPT_SENSOR_OVERRIDE_REQUEST = 0x8044
 
     MSG_ID_TD_TRAINING_TEST_OVERRIDE_REQUEST = 0x8999
 
Index: leahi_dialin/common/td_defs.py
===================================================================
diff -u -r175101bed0d998f3e0c6ff24d90603acb0106e4d -r8bcac0e6e7960de5d9bdf925bbf5581cdc97df31
--- leahi_dialin/common/td_defs.py	(.../td_defs.py)	(revision 175101bed0d998f3e0c6ff24d90603acb0106e4d)
+++ leahi_dialin/common/td_defs.py	(.../td_defs.py)	(revision 8bcac0e6e7960de5d9bdf925bbf5581cdc97df31)
@@ -249,7 +249,9 @@
 class TDEjectorAttributes(DialinEnum):
     STATE                                                   = 0     # Ejector State to command
     SET_SPEED                                               = 1     # Ejector Set Speed
-    NUM_OF_EJECTOR_ATTRIBUTES                               = 2     # Number of Ejector Attributes
+    OPT_SNSR_RETRACT                                        = 2     # Ejector optical sensor retract
+    OPT_SNSR_ENGAGE                                         = 3     # Ejector optical sensor engage
+    NUM_OF_EJECTOR_ATTRIBUTES                               = 4     # Number of Ejector Attributes
 
 @unique
 class TDPressureSensorNames(DialinEnum):
Index: leahi_dialin/td/modules/ejector.py
===================================================================
diff -u -rec8a2600b9e8cf6fe7e02c200a1c24221ca86863 -r8bcac0e6e7960de5d9bdf925bbf5581cdc97df31
--- leahi_dialin/td/modules/ejector.py	(.../ejector.py)	(revision ec8a2600b9e8cf6fe7e02c200a1c24221ca86863)
+++ leahi_dialin/td/modules/ejector.py	(.../ejector.py)	(revision 8bcac0e6e7960de5d9bdf925bbf5581cdc97df31)
@@ -51,7 +51,9 @@
         self.h5_motor = {
             TDEjectorNames.H5_MOTOR.name: {
                 TDEjectorAttributes.STATE.name: 0,
-                TDEjectorAttributes.SET_SPEED.name: 0.0
+                TDEjectorAttributes.SET_SPEED.name: 0.0,
+                TDEjectorAttributes.OPT_SNSR_RETRACT: 0,
+                TDEjectorAttributes.OPT_SNSR_ENGAGE: 0
             }
         }
         self.td_ejector_timestamp = 0
@@ -68,6 +70,10 @@
             message['message'][MsgFieldPositions.START_POS_FIELD_1:MsgFieldPositions.END_POS_FIELD_1]))[0]
         self.h5_motor[TDEjectorNames.H5_MOTOR.name][TDEjectorAttributes.SET_SPEED.name] = struct.unpack('f', bytearray(
             message['message'][MsgFieldPositions.START_POS_FIELD_2:MsgFieldPositions.END_POS_FIELD_2]))[0]
+        self.h5_motor[TDEjectorNames.H5_MOTOR.name][TDEjectorAttributes.OPT_SNSR_RETRACT.name] = struct.unpack('i', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_3:MsgFieldPositions.END_POS_FIELD_3]))[0]
+        self.h5_motor[TDEjectorNames.H5_MOTOR.name][TDEjectorAttributes.OPT_SNSR_ENGAGE.name] = struct.unpack('i', bytearray(
+            message['message'][MsgFieldPositions.START_POS_FIELD_4:MsgFieldPositions.END_POS_FIELD_4]))[0]
 
         self.td_ejector_timestamp = timestamp
 
@@ -175,4 +181,49 @@
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
         else:
             self.logger.debug("Timeout!!!!")
-            return False
\ No newline at end of file
+            return False
+
+    def cmd_ejector_optical_sensor_override(self, sensor: int, sensor_active: int,  reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends the ejector optical sensor override command
+    .
+        Constraints:
+            Must be logged into TD.
+            Optical sensor retract ID = 0
+            Optical sensor engage ID = 1
+
+            Sensor active (engage) = 0
+            Sensor inactive (retract) = 1
+
+        @param sensor: int - sensor ID
+        @param sensor_active:  int - override to be active or inactive
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+        """
+
+        rst = integer_to_bytearray(reset)
+        sen = integer_to_bytearray(sensor)
+        active = integer_to_bytearray(sensor_active)
+        payload = rst + active + sen
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_td_ch_id,
+                                              message_id=MsgIds.MSG_ID_TD_EJECTOR_OPT_SENSOR_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        self.logger.debug("Override sensor ID {} to {}".format(sen, active))
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            if reset == RESET:
+                str_res = "reset back to normal.  "
+            else:
+                str_res = "Override sensor {} to {}".format(sen, active)
+            self.logger.debug(str_res)
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False