diff --git a/examples/knx-demo/platformio-ci.ini b/examples/knx-demo/platformio-ci.ini
index 57c4188..6d3c4dc 100644
--- a/examples/knx-demo/platformio-ci.ini
+++ b/examples/knx-demo/platformio-ci.ini
@@ -19,7 +19,7 @@ lib_deps =
   knx
 
 build_flags =
-  -DMEDIUM_TYPE=2
+  -DMASK_VERSION=0x27B0
   -Wno-unknown-pragmas
 ;-----------------------------------------------------------
 
diff --git a/examples/knx-demo/platformio.ini b/examples/knx-demo/platformio.ini
index 6134de6..94beed3 100644
--- a/examples/knx-demo/platformio.ini
+++ b/examples/knx-demo/platformio.ini
@@ -28,7 +28,7 @@ lib_deps =
   knx
 
 build_flags =
-  -DMEDIUM_TYPE=2
+  -DMASK_VERSION=0x27B0
   -Wno-unknown-pragmas
 ;-----------------------------------------------------------
 
diff --git a/examples/knx-linux-coupler/CMakeLists.txt b/examples/knx-linux-coupler/CMakeLists.txt
index dce9641..90d48de 100644
--- a/examples/knx-linux-coupler/CMakeLists.txt
+++ b/examples/knx-linux-coupler/CMakeLists.txt
@@ -136,3 +136,4 @@ include_directories(../../src)
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -Wno-unknown-pragmas -g -O0")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wall -Wno-unknown-pragmas -g -O0")
 set_property(TARGET knx-linux PROPERTY CXX_STANDARD 11)
+add_definitions(-DMASK_VERSION=0x091A)
diff --git a/examples/knx-linux-coupler/main.cpp b/examples/knx-linux-coupler/main.cpp
index a860db0..ac564d2 100644
--- a/examples/knx-linux-coupler/main.cpp
+++ b/examples/knx-linux-coupler/main.cpp
@@ -32,8 +32,13 @@ bool isSendHidReportPossible()
     return false;
 }
 
+#if MASK_VERSION == 0x091A
 KnxFacade<LinuxPlatform, Bau091A> knx; // IP/TP1 coupler
-//KnxFacade<LinuxPlatform, Bau2920> knx; // TP1/RF coupler
+#elif MASK_VERSION == 0x2920
+KnxFacade<LinuxPlatform, Bau2920> knx; // TP1/RF coupler
+#else
+#error Mask version not supported yet!
+#endif
 
 void appLoop()
 {
diff --git a/examples/knx-linux/CMakeLists.txt b/examples/knx-linux/CMakeLists.txt
index fc85f93..a36092d 100644
--- a/examples/knx-linux/CMakeLists.txt
+++ b/examples/knx-linux/CMakeLists.txt
@@ -136,4 +136,4 @@ include_directories(../../src)
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -Wno-unknown-pragmas -g -O0")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wall -Wno-unknown-pragmas -g -O0")
 set_property(TARGET knx-linux PROPERTY CXX_STANDARD 11)
-
+add_definitions(-DMASK_VERSION=0x57B0)
diff --git a/examples/knx-usb/platformio-ci.ini b/examples/knx-usb/platformio-ci.ini
index 0dd3625..5f96f44 100644
--- a/examples/knx-usb/platformio-ci.ini
+++ b/examples/knx-usb/platformio-ci.ini
@@ -24,7 +24,7 @@ lib_deps =
   knx
   
 build_flags =
-  -DMEDIUM_TYPE=2
+  -DMASK_VERSION=0x27B0
   -DUSE_USB
   -DUSE_TINYUSB
   -Wno-unknown-pragmas
diff --git a/examples/knx-usb/platformio.ini b/examples/knx-usb/platformio.ini
index b3ae3ad..c4b69f1 100644
--- a/examples/knx-usb/platformio.ini
+++ b/examples/knx-usb/platformio.ini
@@ -32,7 +32,7 @@ lib_deps =
   knx
 
 build_flags =
-  -DMEDIUM_TYPE=2
+  -DMASK_VERSION=0x27B0
   -DUSE_USB
   -DUSE_TINYUSB
   -Wno-unknown-pragmas
diff --git a/src/knx/config.h b/src/knx/config.h
index 3abb23a..19dc3d8 100644
--- a/src/knx/config.h
+++ b/src/knx/config.h
@@ -13,7 +13,7 @@
 #endif
 
 // Normal devices
-#define MASK_VERSION 0x07B0
+//#define MASK_VERSION 0x07B0
 //#define MASK_VERSION 0x27B0
 //#define MASK_VERSION 0x57B0