diff --git a/src/Communication_Protocol.h b/src/Communication_Protocol.h
index 4287249..28382e0 100644
--- a/src/Communication_Protocol.h
+++ b/src/Communication_Protocol.h
@@ -16,8 +16,8 @@
 #define SET_AUTO_EXPOSURE 0x52
 #define GET_INTEGRAL_TIME_AND_DATA_PROCESS 0x53
 #define GET_TEMPRETURE 0x54
-#define SET_SHUTTER_OPEN 0x55
-#define SET_SHUTTER_CLOSE 0x56
+#define SET_SHUTTER_OPEN 0x56
+#define SET_SHUTTER_CLOSE 0x55
 #define GET_BANDNUMBER 0x57
 #define SET_WEAVE_COEFF 0x58
 #define GET_WEAVE_COEFF 0x59