diff --git a/api/src/opentrons/drivers/absorbance_reader/async_byonoy.py b/api/src/opentrons/drivers/absorbance_reader/async_byonoy.py
index f9d0f0f39e77..489cb92d4f52 100644
--- a/api/src/opentrons/drivers/absorbance_reader/async_byonoy.py
+++ b/api/src/opentrons/drivers/absorbance_reader/async_byonoy.py
@@ -11,6 +11,7 @@
     AbsorbanceHidInterface as AbsProtocol,
     ErrorCodeNames,
     DeviceStateNames,
+    SlotStateNames,
 )
 from opentrons.drivers.types import (
     AbsorbanceReaderLidStatus,
@@ -276,17 +277,10 @@ async def get_single_measurement(self, wavelength: int) -> List[float]:
         )
 
     async def get_plate_presence(self) -> AbsorbanceReaderPlatePresence:
-
         presence = await self._loop.run_in_executor(
             executor=self._executor, func=self._get_slot_status
         )
-        map = {
-            AbsProtocol.SlotState.BYONOY_SLOT_STATE_UNKNOWN: AbsorbanceReaderPlatePresence.UNKNOWN,
-            AbsProtocol.SlotState.BYONOY_SLOT_STATE_EMPTY: AbsorbanceReaderPlatePresence.ABSENT,
-            AbsProtocol.SlotState.BYONOY_SLOT_STATE_OCCUPIED: AbsorbanceReaderPlatePresence.PRESENT,
-            AbsProtocol.SlotState.BYONOY_SLOT_UNDETERMINED: AbsorbanceReaderPlatePresence.UNKNOWN,
-        }
-        return map[presence]
+        return self.convert_plate_presence(presence.name)
 
     async def get_device_status(self) -> AbsorbanceReaderDeviceState:
         status = await self._loop.run_in_executor(
@@ -306,3 +300,15 @@ def convert_device_state(
             "BYONOY_DEVICE_STATE_ERROR": AbsorbanceReaderDeviceState.ERROR,
         }
         return state_map[device_state]
+
+    @staticmethod
+    def convert_plate_presence(
+        slot_state: SlotStateNames,
+    ) -> AbsorbanceReaderPlatePresence:
+        state_map: Dict[SlotStateNames, AbsorbanceReaderPlatePresence] = {
+            "BYONOY_SLOT_UNKNOWN": AbsorbanceReaderPlatePresence.UNKNOWN,
+            "BYONOY_SLOT_EMPTY": AbsorbanceReaderPlatePresence.ABSENT,
+            "BYONOY_SLOT_OCCUPIED": AbsorbanceReaderPlatePresence.PRESENT,
+            "BYONOY_SLOT_UNDETERMINED": AbsorbanceReaderPlatePresence.UNKNOWN,
+        }
+        return state_map[slot_state]
\ No newline at end of file