diff --git a/slsDetectorGui/include/qDrawPlot.h b/slsDetectorGui/include/qDrawPlot.h
index df96214bf..2c8739040 100644
--- a/slsDetectorGui/include/qDrawPlot.h
+++ b/slsDetectorGui/include/qDrawPlot.h
@@ -91,8 +91,10 @@ class qDrawPlot : public QWidget, private Ui::PlotObject {
     void Update2dPlot();
     void Update1dXYRange();
     void Update2dXYRange();
+    void rearrangeGotthard25data(double *data);
 
     static const int NUM_PEDESTAL_FRAMES = 20;
+    static const int NUM_GOTTHARD25_CHANS = 1280;
     sls::Detector *det;
     slsDetectorDefs::detectorType detType;
 
@@ -164,4 +166,5 @@ class qDrawPlot : public QWidget, private Ui::PlotObject {
     uint32_t pixelMask{0};
     uint32_t gainMask{0};
     int gainOffset{0};
+    bool gotthard25;
 };
diff --git a/slsDetectorGui/src/qDrawPlot.cpp b/slsDetectorGui/src/qDrawPlot.cpp
index a95c9efcd..5101c11dd 100644
--- a/slsDetectorGui/src/qDrawPlot.cpp
+++ b/slsDetectorGui/src/qDrawPlot.cpp
@@ -80,6 +80,10 @@ void qDrawPlot::SetupWidgetWindow() {
         fileSaveName = "Image";
     }
 
+    gotthard25 = ((detType == slsDetectorDefs::GOTTHARD2 ||
+                   detType == slsDetectorDefs::GOTTHARD) &&
+                  det->size() == 2);
+
     SetupPlots();
     SetDataCallBack(true);
     det->registerAcquisitionFinishedCallback(&(GetAcquisitionFinishedCallBack),
@@ -807,6 +811,11 @@ void qDrawPlot::GetData(detectorData *data, uint64_t frameIndex,
         isGainDataExtracted = false;
     }
 
+    // gotthard25um rearranging
+    if (gotthard25) {
+        rearrangeGotthard25data(rawData);
+    }
+
     // title and frame index titles
     plotTitle =
         plotTitlePrefix + QString(data->fileName.c_str()).section('/', -1);
@@ -1145,6 +1154,18 @@ void qDrawPlot::toDoublePixelData(double *dest, char *source, int size,
     }
 }
 
+void qDrawPlot::rearrangeGotthard25data(double *data) {
+    const int nChans = NUM_GOTTHARD25_CHANS;
+    double temp[nChans * 2] = {0.0};
+    for (int i = 0; i != nChans; ++i) {
+        // master module
+        temp[i * 2] = data[i];
+        // slave module
+        temp[i * 2 + 1] = data[nChans + i];
+    }
+    memcpy(data, temp, nChans * 2 * sizeof(double));
+}
+
 void qDrawPlot::UpdatePlot() {
     std::lock_guard<std::mutex> lock(mPlots);
     LOG(logDEBUG) << "Update Plot";
diff --git a/slsDetectorSoftware/src/DetectorImpl.cpp b/slsDetectorSoftware/src/DetectorImpl.cpp
index 86df25719..5751c5f77 100644
--- a/slsDetectorSoftware/src/DetectorImpl.cpp
+++ b/slsDetectorSoftware/src/DetectorImpl.cpp
@@ -281,6 +281,13 @@ void DetectorImpl::addModule(const std::string &hostname) {
 
     // get type by connecting
     detectorType type = Module::getTypeFromDetector(host, port);
+
+    // gotthard cannot have more than 2 modules (50um=1, 25um=2
+    if ((type == GOTTHARD || type == GOTTHARD2) && modules.size() > 2) {
+        freeSharedMemory();
+        throw sls::RuntimeError("Gotthard cannot have more than 2 modules");
+    }
+
     auto pos = modules.size();
     modules.emplace_back(
         sls::make_unique<Module>(type, detectorIndex, pos, false));