diff --git a/ophyd_devices/epics/devices/falcon_csaxs.py b/ophyd_devices/epics/devices/falcon_csaxs.py
new file mode 100644
index 0000000..1b3f9a8
--- /dev/null
+++ b/ophyd_devices/epics/devices/falcon_csaxs.py
@@ -0,0 +1,88 @@
+from ophyd import EpicsSignal, EpicsSignalRO, EpicsSignalWithRBV, Component as Cpt, Device
+
+from ophyd.mca import EpicsMCARecord, EpicsDXPMapping, EpicsDXPLowLevel, EpicsDXPMultiElementSystem
+from ophyd.areadetector.plugins import HDF5Plugin
+
+
+class EpicsDXPFalcon(Device):
+    """All high-level DXP parameters for each channel"""
+
+    # Preset options
+    preset_mode = Cpt(EpicsSignalWithRBV, "PresetMode", string=True)
+    preset_real = Cpt(EpicsSignalWithRBV, "PresetReal")
+    preset_triggers = Cpt(EpicsSignalWithRBV, "PresetTriggers")
+    preset_events = Cpt(EpicsSignalWithRBV, "PresetEvents")
+
+    elapsed_live_time = Cpt(EpicsSignal, "ElapsedLiveTime")
+    elapsed_real_time = Cpt(EpicsSignal, "ElapsedRealTime")
+    elapsed_trigger_live_time = Cpt(EpicsSignal, "ElapsedTriggerLiveTime")
+
+    # Energy Filter PVs
+    energy_threshold = Cpt(EpicsSignalWithRBV, "DetectionThreshold")
+    min_pulse_separation = Cpt(EpicsSignalWithRBV, "MinPulsePairSeparation")
+    detection_filter = Cpt(EpicsSignalWithRBV, "DetectionFilter", string=True)
+    scale_factor = Cpt(EpicsSignalWithRBV, "ScaleFactor")
+    risetime_optimisation = Cpt(EpicsSignalWithRBV, "RisetimeOptimization")
+
+    # Misc PVs
+    detector_polarity = Cpt(EpicsSignalWithRBV, "DetectorPolarity")
+    decay_time = Cpt(EpicsSignalWithRBV, "DecayTime")
+
+    # read-only diagnostics
+    triggers = Cpt(EpicsSignalRO, "Triggers", lazy=True)
+    events = Cpt(EpicsSignalRO, "Events", lazy=True)
+    input_count_rate = Cpt(EpicsSignalRO, "InputCountRate", lazy=True)
+    output_count_rate = Cpt(EpicsSignalRO, "OutputCountRate", lazy=True)
+    current_pixel = Cpt(EpicsSignal, "CurrentPixel")
+
+    # Trace options
+    trace_data = Cpt(EpicsSignal, "TraceData")
+
+
+class FalconDxp(EpicsDXPFalcon, EpicsDXPLowLevel):
+    pass
+
+
+class FalconCsaxs(EpicsDXPMultiElementSystem, EpicsDXPMapping):
+    """FalxonX1 with HDF5 writer"""
+
+    dxp = Cpt(FalconDxp, "dxp1:")
+    mca = Cpt(EpicsMCARecord, "mca1")
+    hdf5 = Cpt(HDF5Plugin, "HDF1:")
+
+    def __init__(
+        self,
+        prefix="",
+        *,
+        name,
+        kind=None,
+        read_attrs=None,
+        configuration_attrs=None,
+        parent=None,
+        device_manager=None,
+        **kwargs,
+    ):
+        self.device_manager = device_manager
+        self.username = "e21206"  # TODO get from config
+        # self.username = self.device_manager.producer.get(MessageEndpoints.account()).decode()
+        super().__init__(
+            prefix=prefix,
+            name=name,
+            kind=kind,
+            read_attrs=read_attrs,
+            configuration_attrs=configuration_attrs,
+            parent=parent,
+            **kwargs,
+        )
+        # TODO how to get base_path
+        self.service_cfg = {"base_path": f"/sls/X12SA/data/{self.username}/Data10/falcon/"}
+        self.filewriter = FileWriterMixin(self.service_cfg)
+        self.num_frames = 0
+        self.readout = 0.003  # 3 ms
+        self.triggermode = 0  # 0 : internal, scan must set this if hardware triggered
+
+    def stage(self) -> List[object]:
+        return super().stage()
+
+    def unstage(self) -> List[object]:
+        return super().unstage()