diff --git a/slsDetectorSoftware/include/sls/Pattern.h b/slsDetectorSoftware/include/sls/Pattern.h
index 28172b744..64f1de29b 100644
--- a/slsDetectorSoftware/include/sls/Pattern.h
+++ b/slsDetectorSoftware/include/sls/Pattern.h
@@ -34,7 +34,7 @@ class Pattern {
     void validate() const;
     void load(const std::string &fname);
     void save(const std::string &fname);
-    std::string str() const { return {}; }
+    std::string str() const;
 };
 
 } // namespace sls
diff --git a/slsDetectorSoftware/src/Detector.cpp b/slsDetectorSoftware/src/Detector.cpp
index 84c9f2906..04ae3aa6b 100644
--- a/slsDetectorSoftware/src/Detector.cpp
+++ b/slsDetectorSoftware/src/Detector.cpp
@@ -1758,7 +1758,6 @@ void Detector::savePattern(const std::string &fname) {
     auto t = pimpl->Parallel(&Module::getPattern, {});
     auto pat = t.tsquash("Inconsistent pattern parameters between modules");
     pat.validate();
-    std::cout << ToString(pat) << std::endl;
     pat.save(fname);
 }
 
diff --git a/slsDetectorSoftware/src/Pattern.cpp b/slsDetectorSoftware/src/Pattern.cpp
index a8915fab1..46dfe461a 100644
--- a/slsDetectorSoftware/src/Pattern.cpp
+++ b/slsDetectorSoftware/src/Pattern.cpp
@@ -204,4 +204,37 @@ void Pattern::save(const std::string &fname) {
     }
 }
 
+std::string Pattern::str() const {
+    std::ostringstream oss;
+    oss << '[' << std::setfill('0') << std::endl;
+    int addr_width = 4;
+    int word_width = 16;
+    for (int i = 0; i < MAX_PATTERN_LENGTH; ++i) {
+        if (pat->word[i] != 0) {
+            oss << "patword " << ToStringHex(i, addr_width) << " "
+                << ToStringHex(pat->word[i], word_width) << std::endl;
+        }
+    }
+    oss << "patioctrl " << ToStringHex(pat->ioctrl, word_width) << std::endl
+        << "patlimits " << ToStringHex(pat->limits[0], addr_width) << " "
+        << ToStringHex(pat->limits[1], addr_width) << std::endl
+        << "patloop0 " << ToStringHex(pat->loop[0], addr_width) << " "
+        << ToStringHex(pat->loop[1], addr_width) << std::endl
+        << "patnloop0 " << pat->nloop[0] << std::endl
+        << "patloop1 " << ToStringHex(pat->loop[2], addr_width) << " "
+        << ToStringHex(pat->loop[3], addr_width) << std::endl
+        << "patnloop1 " << pat->nloop[1] << std::endl
+        << "patloop2 " << ToStringHex(pat->loop[4], addr_width) << " "
+        << ToStringHex(pat->loop[5], addr_width) << std::endl
+        << "patnloop2 " << pat->nloop[2] << std::endl
+        << "patwait0 " << ToStringHex(pat->wait[0], addr_width) << std::endl
+        << "patwaittime0 " << pat->waittime[0] << std::endl
+        << "patwait1 " << ToStringHex(pat->wait[1], addr_width) << std::endl
+        << "patwaittime1 " << pat->waittime[1] << std::endl
+        << "patwait2 " << ToStringHex(pat->wait[2], addr_width) << std::endl
+        << "patwaittime2 " << pat->waittime[2] << std::endl
+        << ']';
+    return oss.str();
+}
+
 } // namespace sls
\ No newline at end of file