diff --git a/src/gcodecommands.cpp b/src/gcodecommands.cpp
--- a/src/gcodecommands.cpp
+++ b/src/gcodecommands.cpp
@@ -531,6 +531,12 @@
     }
     case M107:
         return QStringLiteral("M107");
+    case M109:
+        if (!value1.isEmpty()) {
+            return QStringLiteral("M109 S%1").arg(value1);
+        } else {
+            return QObject::tr("ERROR! M109: It's obligatory to have an argument");
+        }
     case M112:
         return QStringLiteral("M112");
     case M114:
@@ -555,6 +561,13 @@
             return QObject::tr("ERROR! M140: It's obligatory to have an argument");
         }
     }
+    case M190: {
+        if (!value1.isEmpty()) {
+            return QStringLiteral("M190 S%1").arg(value1);
+        } else {
+            return QObject::tr("ERROR! M190: It's obligatory to have an argument");
+        }
+    }
     case M220: {
         if (!value1.isEmpty()) {
             return QStringLiteral("M220 S%1").arg(value1);
diff --git a/unittests/gcodetests.h b/unittests/gcodetests.h
--- a/unittests/gcodetests.h
+++ b/unittests/gcodetests.h
@@ -45,13 +45,15 @@
     void command_M105();
     void command_M106();
     void command_M107();
+    void command_M109();
     void command_M112();
     void command_M114();
     void command_M115();
     void command_M116();
     void command_M117();
     void command_M119();
     void command_M140();
+    void command_M190();
     void command_M220();
     void command_M221();
     void command_unsupportedM();
diff --git a/unittests/gcodetests.cpp b/unittests/gcodetests.cpp
--- a/unittests/gcodetests.cpp
+++ b/unittests/gcodetests.cpp
@@ -189,6 +189,12 @@
     QVERIFY(GCode::toCommand(GCode::M107) == QStringLiteral("M107"));
 }
 
+void GCodeTests::command_M109()
+{
+    QVERIFY(GCode::toCommand(GCode::M109) == QStringLiteral("ERROR! M109: It's obligatory to have an argument"));
+    QVERIFY(GCode::toCommand(GCode::M109, QStringLiteral("100")) == QStringLiteral("M109 S100"));
+}
+
 void GCodeTests::command_M112()
 {
     QVERIFY(GCode::toCommand(GCode::M112) == QStringLiteral("M112"));
@@ -226,6 +232,12 @@
     QVERIFY(GCode::toCommand(GCode::M140, QStringLiteral("100")) == QStringLiteral("M140 S100"));
 }
 
+void GCodeTests::command_M190()
+{
+    QVERIFY(GCode::toCommand(GCode::M190) == QStringLiteral("ERROR! M190: It's obligatory to have an argument"));
+    QVERIFY(GCode::toCommand(GCode::M190, QStringLiteral("100")) == QStringLiteral("M190 S100"));
+}
+
 void GCodeTests::command_M220()
 {
     QVERIFY(GCode::toCommand(GCode::M220) == QStringLiteral("ERROR! M220: It's obligatory to have an argument"));