diff --git a/ophyd_devices/sim/sim_camera.py b/ophyd_devices/sim/sim_camera.py
index 7e0c349..22a5a6d 100644
--- a/ophyd_devices/sim/sim_camera.py
+++ b/ophyd_devices/sim/sim_camera.py
@@ -63,7 +63,7 @@ class SimCameraSetup(CustomDetectorMixin):
             self.parent.h5_writer.prepare(
                 file_path=self.parent.filepath.get(), h5_entry="/entry/data/data"
             )
-            self.publish_file_location(done=False)
+            self.publish_file_location(done=False, successful=False)
         self.parent.stopped = False
 
     def on_unstage(self) -> None:
@@ -122,13 +122,15 @@ class SimCamera(PSIDetectorBase):
     def __init__(
         self, name, *, kind=None, parent=None, sim_init: dict = None, device_manager=None, **kwargs
     ):
-        self.init_sim_params = sim_init
+        self.sim_init = sim_init
         self._registered_proxies = {}
         self.sim = self.sim_cls(parent=self, **kwargs)
         self.h5_writer = H5Writer()
         super().__init__(
             name=name, parent=parent, kind=kind, device_manager=device_manager, **kwargs
         )
+        if self.sim_init:
+            self.sim.set_init(self.sim_init)
 
     @property
     def registered_proxies(self) -> None:
diff --git a/ophyd_devices/sim/sim_data.py b/ophyd_devices/sim/sim_data.py
index ef92cc8..4314922 100644
--- a/ophyd_devices/sim/sim_data.py
+++ b/ophyd_devices/sim/sim_data.py
@@ -82,13 +82,13 @@ class SimulatedDataBase(ABC):
     The class provides the following methods:
 
     - execute_simulation_method:    execute a method from the simulated data class or reroute execution to device proxy class
-    - sim_select_model:             select the active simulation model
-    - sim_params:                   get the parameters for the active simulation mdoel
+    - select_model:             select the active simulation model
+    - params:                   get the parameters for the active simulation mdoel
     - sim_models:                   get the available simulation models
     - update_sim_state:             update the simulated state of the device
     """
 
-    USER_ACCESS = ["sim_params", "sim_select_model", "sim_get_models", "sim_show_all"]
+    USER_ACCESS = ["params", "select_model", "get_models", "show_all"]
 
     def __init__(self, *args, parent=None, **kwargs) -> None:
         """
@@ -122,7 +122,12 @@ class SimulatedDataBase(ABC):
             return method(*args, **kwargs)
         raise SimulatedDataException(f"Method {method} is not available for {self.parent.name}")
 
+    # TODO remove after refactoring code in main
     def sim_select_model(self, model: str) -> None:
+        """Select the active simulation model."""
+        self.select_model(model)
+
+    def select_model(self, model: str) -> None:
         """
         Method to select the active simulation model.
         It will initiate the model_cls and parameters for the model.
@@ -138,7 +143,7 @@ class SimulatedDataBase(ABC):
         print(self._get_table_active_simulation())
 
     @property
-    def sim_params(self) -> dict:
+    def params(self) -> dict:
         """
         Property that returns the parameters for the active simulation model. It can also
         be used to set the parameters for the active simulation updating the parameters of the model.
@@ -147,17 +152,17 @@ class SimulatedDataBase(ABC):
             dict: Parameters for the active simulation model.
 
         The following example shows how to update the noise parameter of the current simulation.
-        >>> dev.<device>.sim.sim_params = {"noise": "poisson"}
+        >>> dev.<device>.sim.params = {"noise": "poisson"}
         """
         return self._params
 
-    @sim_params.setter
-    def sim_params(self, params: dict):
+    @params.setter
+    def params(self, params: dict):
         """
         Method to set the parameters for the active simulation model.
         """
         for k, v in params.items():
-            if k in self.sim_params:
+            if k in self.params:
                 if k == "noise":
                     self._params[k] = NoiseType(v)
                 elif k == "hot_pixel_types":
@@ -167,9 +172,9 @@ class SimulatedDataBase(ABC):
                 if isinstance(self._model, Model) and k in self._model_params:
                     self._model_params[k].value = v
             else:
-                raise SimulatedDataException(f"Parameter {k} not found in {self.sim_params}.")
+                raise SimulatedDataException(f"Parameter {k} not found in {self.params}.")
 
-    def sim_get_models(self) -> list:
+    def get_models(self) -> list:
         """
         Method to get the all available simulation models.
         """
@@ -221,7 +226,7 @@ class SimulatedDataBase(ABC):
         table = PrettyTable()
         table.title = f"Currently active model: {self._model}"
         table.field_names = ["Parameter", "Value", "Type"]
-        for k, v in self.sim_params.items():
+        for k, v in self.params.items():
             table.add_row([k, f"{v}", f"{type(v)}"])
         table._min_width["Parameter"] = 25 if width > 75 else width // 3
         table._min_width["Type"] = 25 if width > 75 else width // 3
@@ -238,16 +243,16 @@ class SimulatedDataBase(ABC):
         table.title = "Available methods within the simulation module"
         table.field_names = ["Method", "Docstring"]
 
-        table.add_row([self.sim_get_models.__name__, f"{self.sim_get_models.__doc__}"])
-        table.add_row([self.sim_select_model.__name__, self.sim_select_model.__doc__])
-        table.add_row(["sim_params", self.__class__.sim_params.__doc__])
+        table.add_row([self.get_models.__name__, f"{self.get_models.__doc__}"])
+        table.add_row([self.select_model.__name__, self.select_model.__doc__])
+        table.add_row(["params", self.__class__.params.__doc__])
         table.max_table_width = width
         table._min_table_width = width
         table.align["Docstring"] = "l"
 
         return table
 
-    def sim_show_all(self):
+    def show_all(self):
         """Returns a summary about the active simulation and available methods."""
         width = 150
         print(self._get_table_active_simulation(width=width))
@@ -260,6 +265,15 @@ class SimulatedDataBase(ABC):
         table._min_table_width = width
         print(table)
 
+    def set_init(self, sim_init: dict["model", "params"]) -> None:
+        """Set the initial simulation parameters.
+
+        Args:
+            sim_init (dict["model"]): Dictionary to initiate parameters of the simulation.
+        """
+        self.select_model(sim_init.get("model"))
+        self.params = sim_init.get("params", {})
+
 
 class SimulatedPositioner(SimulatedDataBase):
     """Simulated data class for a positioner."""
@@ -317,7 +331,7 @@ class SimulatedDataMonitor(SimulatedDataBase):
 
     def _init_default(self) -> None:
         """Initialize the default parameters for the simulated data."""
-        self.sim_select_model("ConstantModel")
+        self.select_model("ConstantModel")
 
     def get_model_cls(self, model: str) -> any:
         """Get the class for the active simulation model."""
@@ -411,14 +425,14 @@ class SimulatedDataMonitor(SimulatedDataBase):
         Returns:
             float: Value computed by the active model.
         """
-        mot_name = self.sim_params["ref_motor"]
+        mot_name = self.params["ref_motor"]
         if self.parent.device_manager and mot_name in self.parent.device_manager.devices:
             motor_pos = self.parent.device_manager.devices[mot_name].obj.read()[mot_name]["value"]
         else:
             motor_pos = 0
         method = self._model
         value = int(method.eval(params=self._model_params, x=motor_pos))
-        return self._add_noise(value, self.sim_params["noise"], self.sim_params["noise_multiplier"])
+        return self._add_noise(value, self.params["noise"], self.params["noise_multiplier"])
 
     def _add_noise(self, v: int, noise: NoiseType, noise_multiplier: float) -> int:
         """
@@ -478,8 +492,8 @@ class SimulatedDataWaveform(SimulatedDataMonitor):
         size = size[0] if isinstance(size, tuple) else size
         method = self._model
         value = method.eval(params=self._model_params, x=np.array(range(size)))
-        value *= self.sim_params["amplitude"] / np.max(value)
-        return self._add_noise(value, self.sim_params["noise"], self.sim_params["noise_multiplier"])
+        value *= self.params["amplitude"] / np.max(value)
+        return self._add_noise(value, self.params["noise"], self.params["noise_multiplier"])
 
     def _add_noise(self, v: np.ndarray, noise: NoiseType, noise_multiplier: float) -> np.ndarray:
         """Add noise to the simulated data.
@@ -515,7 +529,7 @@ class SimulatedDataCamera(SimulatedDataBase):
 
         Use the default model "Gaussian".
         """
-        self.sim_select_model(SimulationType2D.GAUSSIAN)
+        self.select_model(SimulationType2D.GAUSSIAN)
 
     def init_2D_models(self) -> dict:
         """
@@ -609,13 +623,13 @@ class SimulatedDataCamera(SimulatedDataBase):
         """Compute a return value for SimulationType2D constant."""
         try:
             shape = self.parent.image_shape.get()
-            v = self.sim_params.get("amplitude") * np.ones(shape, dtype=np.float32)
-            v = self._add_noise(v, self.sim_params["noise"], self.sim_params["noise_multiplier"])
+            v = self.params.get("amplitude") * np.ones(shape, dtype=np.float32)
+            v = self._add_noise(v, self.params["noise"], self.params["noise_multiplier"])
             return self._add_hot_pixel(
                 v,
-                coords=self.sim_params["hot_pixel_coords"],
-                hot_pixel_types=self.sim_params["hot_pixel_types"],
-                values=self.sim_params["hot_pixel_values"],
+                coords=self.params["hot_pixel_coords"],
+                hot_pixel_types=self.params["hot_pixel_types"],
+                values=self.params["hot_pixel_values"],
             )
         except SimulatedDataException as exc:
             raise SimulatedDataException(
@@ -634,9 +648,9 @@ class SimulatedDataCamera(SimulatedDataBase):
         """
 
         try:
-            amp = self.sim_params.get("amplitude")
-            cov = self.sim_params.get("covariance")
-            cen_off = self.sim_params.get("center_offset")
+            amp = self.params.get("amplitude")
+            cov = self.params.get("covariance")
+            cen_off = self.params.get("center_offset")
             shape = self.sim_state[self.parent.image_shape.name]["value"]
             pos, offset, cov, amp = self._prepare_params_gauss(
                 amp=amp, cov=cov, offset=cen_off, shape=shape
@@ -644,15 +658,13 @@ class SimulatedDataCamera(SimulatedDataBase):
 
             v = self._compute_multivariate_gaussian(pos=pos, cen_off=offset, cov=cov, amp=amp)
             v = self._add_noise(
-                v,
-                noise=self.sim_params["noise"],
-                noise_multiplier=self.sim_params["noise_multiplier"],
+                v, noise=self.params["noise"], noise_multiplier=self.params["noise_multiplier"]
             )
             return self._add_hot_pixel(
                 v,
-                coords=self.sim_params["hot_pixel_coords"],
-                hot_pixel_types=self.sim_params["hot_pixel_types"],
-                values=self.sim_params["hot_pixel_values"],
+                coords=self.params["hot_pixel_coords"],
+                hot_pixel_types=self.params["hot_pixel_types"],
+                values=self.params["hot_pixel_values"],
             )
         except SimulatedDataException as exc:
             raise SimulatedDataException(
diff --git a/ophyd_devices/sim/sim_flyer.py b/ophyd_devices/sim/sim_flyer.py
index 6781d65..77b2e40 100644
--- a/ophyd_devices/sim/sim_flyer.py
+++ b/ophyd_devices/sim/sim_flyer.py
@@ -48,6 +48,7 @@ class SimFlyer(Device, FlyerInterface):
         parent=None,
         kind=None,
         device_manager=None,
+        sim_init: dict = None,
         # TODO remove after refactoring config
         delay: int = 1,
         update_frequency: int = 100,
@@ -55,6 +56,7 @@ class SimFlyer(Device, FlyerInterface):
     ):
 
         self.sim = self.sim_cls(parent=self, **kwargs)
+        self.sim_init = sim_init
         self.precision = precision
         self.device_manager = device_manager
         self._registered_proxies = {}
@@ -62,6 +64,8 @@ class SimFlyer(Device, FlyerInterface):
         super().__init__(name=name, parent=parent, kind=kind, **kwargs)
         self.sim.sim_state[self.name] = self.sim.sim_state.pop(self.readback.name, None)
         self.readback.name = self.name
+        if self.sim_init:
+            self.sim.set_init(self.sim_init)
 
     @property
     def registered_proxies(self) -> None:
diff --git a/ophyd_devices/sim/sim_frameworks.py b/ophyd_devices/sim/sim_frameworks.py
index 3f00855..4b1aae6 100644
--- a/ophyd_devices/sim/sim_frameworks.py
+++ b/ophyd_devices/sim/sim_frameworks.py
@@ -2,6 +2,9 @@ from abc import ABC, abstractmethod
 from collections import defaultdict
 
 import h5py
+
+# Necessary import to allow h5py to open compressed h5files.
+# pylint: disable=unused-import
 import hdf5plugin  # noqa: F401
 import numpy as np
 from ophyd import Kind, Staged
@@ -87,20 +90,7 @@ class SlitProxy(DeviceProxy):
     To update for instance the pixel_size directly, you can directly access the DeviceConfig via
     `dev.eiger.get_device_config()` or update it `dev.eiger.get_device_config({'eiger' : {'pixel_size': 0.1}})`
 
-    slit_sim:
-        readoutPriority: baseline
-        deviceClass: SlitProxy
-        deviceConfig:
-            eiger:
-                signal_name: image
-                center_offset: [0, 0] # [x,y]
-                covariance: [[1000, 500], [200, 1000]] # [[x,x],[y,y]]
-                pixel_size: 0.01
-                ref_motors: [samx, samy]
-                slit_width: [1, 1]
-                motor_dir: [0, 1] # x:0 , y:1, z:2 coordinates
-        enabled: true
-        readOnly: false
+    An example for the configuration of this is device is in ophyd_devices.configs.ophyd_devices_simulation.yaml
     """
 
     USER_ACCESS = ["enabled", "lookup", "help"]
@@ -126,7 +116,7 @@ class SlitProxy(DeviceProxy):
             np.ndarray: Lookup table for the simulated camera.
         """
         device_obj = self.device_manager.devices.get(device_name).obj
-        params = device_obj.sim.sim_params
+        params = device_obj.sim.params
         shape = device_obj.image_shape.get()
         params.update(
             {
@@ -197,18 +187,10 @@ class SlitProxy(DeviceProxy):
 class H5ImageReplayProxy(DeviceProxy):
     """This Proxy class can be used to replay images from an h5 file.
 
-    If the number of requested images is larger than the number of available iamges, the images will be replayed from the beginning.
+    If the number of requested images is larger than the number of available iamges,
+    the images will be replayed from the beginning.
 
-    h5_image_sim:
-        readoutPriority: baseline
-        deviceClass: H5ImageReplayProxy
-        deviceConfig:
-            eiger:
-                signal_name: image
-                file_source: /path/to/h5file.h5
-                h5_entry: /entry/data
-        enabled: true
-        readOnly: false
+    An example for the configuration of this is device is in ophyd_devices.configs.ophyd_devices_simulation.yaml
     """
 
     USER_ACCESS = ["file_source", "h5_entry"]
diff --git a/ophyd_devices/sim/sim_monitor.py b/ophyd_devices/sim/sim_monitor.py
index 9846f20..8326403 100644
--- a/ophyd_devices/sim/sim_monitor.py
+++ b/ophyd_devices/sim/sim_monitor.py
@@ -1,12 +1,9 @@
-from typing import Literal
-
 import numpy as np
 from bec_lib import messages
 from bec_lib.endpoints import MessageEndpoints
 from bec_lib.logger import bec_logger
 from ophyd import Component as Cpt
 from ophyd import Device, Kind
-from typeguard import typechecked
 
 from ophyd_devices.interfaces.base_classes.psi_detector_base import (
     CustomDetectorMixin,
@@ -60,7 +57,7 @@ class SimMonitor(Device):
         **kwargs,
     ):
         self.precision = precision
-        self.init_sim_params = sim_init
+        self.sim_init = sim_init
         self.device_manager = device_manager
         self.sim = self.sim_cls(parent=self, **kwargs)
         self._registered_proxies = {}
@@ -68,6 +65,8 @@ class SimMonitor(Device):
         super().__init__(name=name, parent=parent, kind=kind, **kwargs)
         self.sim.sim_state[self.name] = self.sim.sim_state.pop(self.readback.name, None)
         self.readback.name = self.name
+        if self.sim_init:
+            self.sim.set_init(self.sim_init)
 
     @property
     def registered_proxies(self) -> None:
@@ -112,7 +111,7 @@ class SimMonitorAsyncPrepare(CustomDetectorMixin):
         if self.parent.scaninfo.scan_msg is None:
             return
         metadata = self.parent.scaninfo.scan_msg.metadata
-        metadata.update({"async_update": self.parent.async_update})
+        metadata.update({"async_update": self.parent.async_update.get()})
 
         msg = messages.DeviceMessage(
             signals={self.parent.readback.name: self.parent.data_buffer},
@@ -163,6 +162,7 @@ class SimMonitorAsync(PSIDetectorBase):
 
     readback = Cpt(ReadOnlySignal, value=BIT_DEPTH(0), kind=Kind.hinted, compute_readback=True)
     current_trigger = Cpt(SetableSignal, value=BIT_DEPTH(0), kind=Kind.config)
+    async_update = Cpt(SetableSignal, value="extend", kind=Kind.config)
 
     SUB_READBACK = "readback"
     SUB_PROGRESS = "progress"
@@ -171,7 +171,7 @@ class SimMonitorAsync(PSIDetectorBase):
     def __init__(
         self, name, *, sim_init: dict = None, parent=None, kind=None, device_manager=None, **kwargs
     ):
-        self.init_sim_params = sim_init
+        self.sim_init = sim_init
         self.device_manager = device_manager
         self.sim = self.sim_cls(parent=self, **kwargs)
         self._registered_proxies = {}
@@ -182,7 +182,8 @@ class SimMonitorAsync(PSIDetectorBase):
         self.sim.sim_state[self.name] = self.sim.sim_state.pop(self.readback.name, None)
         self.readback.name = self.name
         self._data_buffer = {"value": [], "timestamp": []}
-        self._async_update = "extend"
+        if self.sim_init:
+            self.sim.set_init(self.sim_init)
 
     @property
     def data_buffer(self) -> list:
@@ -193,18 +194,3 @@ class SimMonitorAsync(PSIDetectorBase):
     def registered_proxies(self) -> None:
         """Dictionary of registered signal_names and proxies."""
         return self._registered_proxies
-
-    @property
-    def async_update(self) -> str:
-        """Update method for the asynchronous monitor."""
-        return self._async_update
-
-    @async_update.setter
-    @typechecked
-    def async_update(self, value: Literal["extend", "append"]) -> None:
-        """Set the update method for the asynchronous monitor.
-
-        Args:
-            value (str): Can only be "extend" or "append".
-        """
-        self._async_update = value
diff --git a/ophyd_devices/sim/sim_positioner.py b/ophyd_devices/sim/sim_positioner.py
index 4994ff3..e842409 100644
--- a/ophyd_devices/sim/sim_positioner.py
+++ b/ophyd_devices/sim/sim_positioner.py
@@ -78,7 +78,7 @@ class SimPositioner(Device, PositionerBase):
         self.delay = delay
         self.device_manager = device_manager
         self.precision = precision
-        self.init_sim_params = sim_init
+        self.sim_init = sim_init
         self._registered_proxies = {}
 
         self.update_frequency = update_frequency
@@ -94,11 +94,8 @@ class SimPositioner(Device, PositionerBase):
             assert len(limits) == 2
             self.low_limit_travel.put(limits[0])
             self.high_limit_travel.put(limits[1])
-
-    # @property
-    # def connected(self):
-    #     """Return the connected state of the simulated device."""
-    #     return self.dummy_controller.connected
+        if self.sim_init:
+            self.sim.set_init(self.sim_init)
 
     @property
     def limits(self):
diff --git a/ophyd_devices/sim/sim_waveform.py b/ophyd_devices/sim/sim_waveform.py
index 3462d43..baa9a77 100644
--- a/ophyd_devices/sim/sim_waveform.py
+++ b/ophyd_devices/sim/sim_waveform.py
@@ -7,6 +7,7 @@ from ophyd import Component as Cpt
 from ophyd import Device, DeviceStatus, Kind
 
 from ophyd_devices.sim.sim_data import SimulatedDataWaveform
+from ophyd_devices.sim.sim_exception import DeviceStop
 from ophyd_devices.sim.sim_signals import ReadOnlySignal, SetableSignal
 from ophyd_devices.utils.bec_scaninfo_mixin import BecScaninfoMixin
 
@@ -60,7 +61,7 @@ class SimWaveform(Device):
         self, name, *, kind=None, parent=None, sim_init: dict = None, device_manager=None, **kwargs
     ):
         self.device_manager = device_manager
-        self.init_sim_params = sim_init
+        self.sim_init = sim_init
         self._registered_proxies = {}
         self.sim = self.sim_cls(parent=self, **kwargs)
 
@@ -69,6 +70,8 @@ class SimWaveform(Device):
         self._staged = False
         self.scaninfo = None
         self._update_scaninfo()
+        if self.sim_init:
+            self.sim.set_init(self.sim_init)
 
     @property
     def registered_proxies(self) -> None:
diff --git a/tests/test_simulation.py b/tests/test_simulation.py
index 97fbd10..e1be84d 100644
--- a/tests/test_simulation.py
+++ b/tests/test_simulation.py
@@ -96,6 +96,46 @@ def flyer(name="flyer"):
     yield fly
 
 
+def test_camera_with_sim_init():
+    """Test to see if the sim init parameters are passed to the device"""
+    dm = DMMock()
+    sim = SimCamera(name="sim", device_manager=dm)
+    assert sim.sim._model.value == "gaussian"
+    model = "constant"
+    params = {
+        "amplitude": 300,
+        "noise": "uniform",
+        "noise_multiplier": 1,
+        "hot_pixel_coords": [[0, 0], [50, 50]],
+        "hot_pixel_types": ["fluctuating", "constant"],
+        "hot_pixel_values": [2.0, 2.0],
+    }
+    sim = SimCamera(name="sim", device_manager=dm, sim_init={"model": model, "params": params})
+    assert sim.sim._model.value == model
+    assert sim.sim.params == params
+
+
+def test_monitor_with_sim_init():
+    """Test to see if the sim init parameters are passed to the device"""
+    dm = DMMock()
+    sim = SimMonitor(name="sim", device_manager=dm)
+    assert sim.sim._model._name == "constant"
+    model = "GaussianModel"
+    params = {
+        "amplitude": 500,
+        "center": 5,
+        "sigma": 4,
+        "noise": "uniform",
+        "noise_multiplier": 1,
+        "ref_motor": "samy",
+    }
+    sim = SimMonitor(name="sim", device_manager=dm, sim_init={"model": model, "params": params})
+    assert sim.sim._model._name == model.strip("Model").lower()
+    diff_keys = set(sim.sim.params.keys()) - set(params.keys())
+    for k in params:
+        assert sim.sim.params[k] == params[k]
+
+
 def test_signal__init__(signal):
     """Test the BECProtocol class"""
     assert isinstance(signal, BECDeviceProtocol)
@@ -144,41 +184,41 @@ def test_monitor_readback(monitor, center):
     """Test the readback method of SimMonitor."""
     motor_pos = 0
     monitor.device_manager.add_device("samx", value=motor_pos)
-    for model_name in monitor.sim.sim_get_models():
-        monitor.sim.sim_select_model(model_name)
-        monitor.sim.sim_params["noise_multipler"] = 10
-        monitor.sim.sim_params["ref_motor"] = "samx"
-        if "c" in monitor.sim.sim_params:
-            monitor.sim.sim_params["c"] = center
-        elif "center" in monitor.sim.sim_params:
-            monitor.sim.sim_params["center"] = center
+    for model_name in monitor.sim.get_models():
+        monitor.sim.select_model(model_name)
+        monitor.sim.params["noise_multipler"] = 10
+        monitor.sim.params["ref_motor"] = "samx"
+        if "c" in monitor.sim.params:
+            monitor.sim.params["c"] = center
+        elif "center" in monitor.sim.params:
+            monitor.sim.params["center"] = center
         assert isinstance(monitor.read()[monitor.name]["value"], monitor.BIT_DEPTH)
         expected_value = monitor.sim._model.eval(monitor.sim._model_params, x=motor_pos)
         print(expected_value, monitor.read()[monitor.name]["value"])
         tolerance = (
-            monitor.sim.sim_params["noise_multipler"] + 1
+            monitor.sim.params["noise_multipler"] + 1
         )  # due to ceiling in calculation, but maximum +1int
         assert np.isclose(
             monitor.read()[monitor.name]["value"],
             expected_value,
-            atol=monitor.sim.sim_params["noise_multipler"] + 1,
+            atol=monitor.sim.params["noise_multipler"] + 1,
         )
 
 
 @pytest.mark.parametrize("amplitude, noise_multiplier", [(0, 1), (100, 10), (1000, 50)])
 def test_camera_readback(camera, amplitude, noise_multiplier):
     """Test the readback method of SimMonitor."""
-    for model_name in camera.sim.sim_get_models():
-        camera.sim.sim_select_model(model_name)
-        camera.sim.sim_params = {"noise_multiplier": noise_multiplier}
-        camera.sim.sim_params = {"amplitude": amplitude}
-        camera.sim.sim_params = {"noise": "poisson"}
+    for model_name in camera.sim.get_models():
+        camera.sim.select_model(model_name)
+        camera.sim.params = {"noise_multiplier": noise_multiplier}
+        camera.sim.params = {"amplitude": amplitude}
+        camera.sim.params = {"noise": "poisson"}
         assert camera.image.get().shape == camera.SHAPE
         assert isinstance(camera.image.get()[0, 0], camera.BIT_DEPTH)
-        camera.sim.sim_params = {"noise": "uniform"}
-        camera.sim.sim_params = {"hot_pixel_coords": []}
-        camera.sim.sim_params = {"hot_pixel_values": []}
-        camera.sim.sim_params = {"hot_pixel_types": []}
+        camera.sim.params = {"noise": "uniform"}
+        camera.sim.params = {"hot_pixel_coords": []}
+        camera.sim.params = {"hot_pixel_values": []}
+        camera.sim.params = {"hot_pixel_types": []}
         assert camera.image.get().shape == camera.SHAPE
         assert isinstance(camera.image.get()[0, 0], camera.BIT_DEPTH)
         assert (camera.image.get() <= (amplitude + noise_multiplier + 1)).all()
@@ -243,8 +283,9 @@ def test_h5proxy(h5proxy_fixture, camera):
         {camera.name: {"signal_name": "image", "file_source": fname, "h5_entry": h5entry}}
     )
     camera._registered_proxies.update({h5proxy.name: camera.image.name})
-    camera.sim.sim_params = {"noise": "none", "noise_multiplier": 0}
+    camera.sim.params = {"noise": "none", "noise_multiplier": 0}
     camera.scaninfo.sim_mode = True
+    # pylint: disable=no-member
     camera.image_shape.set(data.shape[1:])
     camera.stage()
     img = camera.image.get()
@@ -288,7 +329,7 @@ def test_slitproxy(slitproxy_fixture):
     mock_camera.obj = camera
     mock_samx.obj = samx
     mock_proxy.obj = proxy
-    camera.sim.sim_params = {"noise": "none", "noise_multiplier": 0, "hot_pixel_values": [0, 0, 0]}
+    camera.sim.params = {"noise": "none", "noise_multiplier": 0, "hot_pixel_values": [0, 0, 0]}
     samx.delay = 0
     samx_pos = 0
     samx.move(samx_pos)
@@ -421,7 +462,7 @@ def test_async_mon_send_data_to_bec(async_monitor):
         async_monitor.custom_prepare._send_data_to_bec()
         dev_msg = messages.DeviceMessage(
             signals={async_monitor.readback.name: async_monitor.data_buffer},
-            metadata={"async_update": async_monitor.async_update},
+            metadata={"async_update": async_monitor.async_update.get()},
         )
 
         call = [