diff --git a/receiver/AcquisitionDevice.cpp b/receiver/AcquisitionDevice.cpp
index 1f677e2a..8727c822 100644
--- a/receiver/AcquisitionDevice.cpp
+++ b/receiver/AcquisitionDevice.cpp
@@ -46,7 +46,7 @@ void AcquisitionDevice::PrepareAction(const DiffractionExperiment &experiment) {
     counters.Reset(experiment, data_stream);
 }
 
-void AcquisitionDevice::StartAction(const DiffractionExperiment &experiment) {
+void AcquisitionDevice::StartAction(const DiffractionExperiment &experiment, uint32_t optional_flags) {
     Cancel();
 
     if (experiment.GetModulesNum(data_stream) > max_modules)
@@ -66,7 +66,7 @@ void AcquisitionDevice::StartAction(const DiffractionExperiment &experiment) {
     // Ensure internal WR queue is empty
     work_request_queue.Clear();
 
-    Start(experiment);
+    Start(experiment, optional_flags);
 
     for (uint32_t i = 0; i < buffer_device.size(); i++)
         SendWorkRequest(i);
diff --git a/receiver/AcquisitionDevice.h b/receiver/AcquisitionDevice.h
index 823575e7..cbf1623e 100644
--- a/receiver/AcquisitionDevice.h
+++ b/receiver/AcquisitionDevice.h
@@ -53,7 +53,7 @@ class AcquisitionDevice {
 
     int64_t expected_frames;
 
-    virtual void Start(const DiffractionExperiment& experiment) = 0;
+    virtual void Start(const DiffractionExperiment& experiment, uint32_t flags) = 0;
     virtual void Finalize() {}; // do clean-up after action is done
     virtual void StartSendingWorkRequests() {};
     void SendWorkRequest(uint32_t handle);
@@ -81,7 +81,7 @@ public:
 
     virtual ~AcquisitionDevice() { UnmapBuffers(); };
 
-    void StartAction(const DiffractionExperiment &experiment);
+    void StartAction(const DiffractionExperiment &experiment, uint32_t optional_flags = 0);
     void PrepareAction(const DiffractionExperiment &experiment);
 
     void WaitForActionComplete();
diff --git a/receiver/FPGAAcquisitionDevice.cpp b/receiver/FPGAAcquisitionDevice.cpp
index daabac6a..5a708102 100644
--- a/receiver/FPGAAcquisitionDevice.cpp
+++ b/receiver/FPGAAcquisitionDevice.cpp
@@ -188,14 +188,15 @@ void FPGAAcquisitionDevice::FillActionRegister(const DiffractionExperiment& x, D
         job.mode |= MODE_CONV;
 }
 
-
-void FPGAAcquisitionDevice::Start(const DiffractionExperiment &experiment) {
+void FPGAAcquisitionDevice::Start(const DiffractionExperiment &experiment, uint32_t flag) {
     if (!HW_IsIdle())
         throw(JFJochException(JFJochExceptionCategory::AcquisitionDeviceError,
                               "Hardware action running prior to start of data acquisition"));
     DataCollectionConfig cfg_in{}, cfg_out{};
 
     FillActionRegister(experiment, cfg_in);
+    cfg_in.mode |= flag;
+
     HW_WriteActionRegister(&cfg_in);
     HW_ReadActionRegister(&cfg_out);
 
diff --git a/receiver/FPGAAcquisitionDevice.h b/receiver/FPGAAcquisitionDevice.h
index 21af4bd0..23a305df 100644
--- a/receiver/FPGAAcquisitionDevice.h
+++ b/receiver/FPGAAcquisitionDevice.h
@@ -33,7 +33,7 @@ class FPGAAcquisitionDevice : public AcquisitionDevice {
     virtual bool HW_SendWorkRequest(uint32_t handle) = 0;
     virtual void HW_SetSpotFinderParameters(const SpotFinderParameters &params) = 0;
     void StartSendingWorkRequests() override;
-    void Start(const DiffractionExperiment &experiment) override;
+    void Start(const DiffractionExperiment &experiment, uint32_t flag) override;
 protected:
     std::vector<uint16_t> internal_pkt_gen_frame;
     explicit FPGAAcquisitionDevice(uint16_t data_stream);
diff --git a/receiver/LinuxSocketDevice.cpp b/receiver/LinuxSocketDevice.cpp
index 09b4f537..a2960d21 100644
--- a/receiver/LinuxSocketDevice.cpp
+++ b/receiver/LinuxSocketDevice.cpp
@@ -50,7 +50,7 @@ void LinuxSocketDevice::MeasureThread(int fd) {
     close(fd);
 }
 
-void LinuxSocketDevice::Start(const DiffractionExperiment& experiment) {
+void LinuxSocketDevice::Start(const DiffractionExperiment& experiment, uint32_t optional_flags) {
     if (experiment.GetConversionOnFPGA())
         throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                               "Conversion on CPU flag has to be enabled for Raw Ethernet device");
diff --git a/receiver/LinuxSocketDevice.h b/receiver/LinuxSocketDevice.h
index 80d21e4e..7067071f 100644
--- a/receiver/LinuxSocketDevice.h
+++ b/receiver/LinuxSocketDevice.h
@@ -18,7 +18,7 @@ class LinuxSocketDevice : public AcquisitionDevice {
 
     volatile bool cancel = false;
 
-    void Start(const DiffractionExperiment& experiment) override;
+    void Start(const DiffractionExperiment& experiment, uint32_t optional_flags) override;
 
     void Finalize() override;
     void MeasureThread(int fd);
diff --git a/receiver/MlxRawEthDevice.cpp b/receiver/MlxRawEthDevice.cpp
index 8dc087bc..0c6302fe 100644
--- a/receiver/MlxRawEthDevice.cpp
+++ b/receiver/MlxRawEthDevice.cpp
@@ -72,7 +72,7 @@ void MlxRawEthDevice::MeasureThread() {
     });
 }
 
-void MlxRawEthDevice::Start(const DiffractionExperiment& experiment) {
+void MlxRawEthDevice::Start(const DiffractionExperiment& experiment, uint32_t optional_flags) {
     if (experiment.GetConversionOnFPGA())
         throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                               "Conversion on CPU flag has to be enabled for Raw Ethernet device");
diff --git a/receiver/MlxRawEthDevice.h b/receiver/MlxRawEthDevice.h
index 093a593a..577a6ed6 100644
--- a/receiver/MlxRawEthDevice.h
+++ b/receiver/MlxRawEthDevice.h
@@ -34,7 +34,7 @@ class MlxRawEthDevice : public AcquisitionDevice {
                     ProcessJFPacket &process);
 
     void MeasureThread();
-    void Start(const DiffractionExperiment& experiment) override;
+    void Start(const DiffractionExperiment& experiment, uint32_t optional_flags) override;
     void Finalize() override;
 public:
     MlxRawEthDevice(uint16_t dev_id, uint16_t data_stream, size_t in_frame_buffer_size_modules,
diff --git a/receiver/MockAcquisitionDevice.cpp b/receiver/MockAcquisitionDevice.cpp
index 18b66269..8076e9d8 100644
--- a/receiver/MockAcquisitionDevice.cpp
+++ b/receiver/MockAcquisitionDevice.cpp
@@ -5,7 +5,7 @@
 #include <bitset>
 #include "../jungfrau/JFConversionFloatingPoint.h"
 
-void MockAcquisitionDevice::Start(const DiffractionExperiment& experiment) {
+void MockAcquisitionDevice::Start(const DiffractionExperiment& experiment, uint32_t optional_flags) {
     idle = false;
     cancel = false;
     completed_descriptors = 0;
diff --git a/receiver/MockAcquisitionDevice.h b/receiver/MockAcquisitionDevice.h
index 3f60e8d5..be01398b 100644
--- a/receiver/MockAcquisitionDevice.h
+++ b/receiver/MockAcquisitionDevice.h
@@ -19,7 +19,7 @@ class MockAcquisitionDevice : public AcquisitionDevice {
     ThreadSafeFIFO<Completion> mock_completions;
 
     void SendCompletion(uint32_t handle, uint16_t module_number, uint64_t frame_number);
-    void Start(const DiffractionExperiment& experiment) override;
+    void Start(const DiffractionExperiment& experiment, uint32_t optional_flags) override;
     void MeasureThread();
     void InternalPacketGeneratorThread(uint32_t nmodules, uint32_t nframes);
 public: