diff --git a/private-backend/package/private-backend-1.5.2.jar b/private-backend/package/private-backend-1.5.2.jar
index fcc3ea8..e37681f 100644
Binary files a/private-backend/package/private-backend-1.5.2.jar and b/private-backend/package/private-backend-1.5.2.jar differ
diff --git a/private-backend/src/main/java/net/irext/decode/sdk/bean/ACStatus.java b/private-backend/src/main/java/net/irext/decode/sdk/bean/ACStatus.java
index 4aa6080..b655dcf 100644
--- a/private-backend/src/main/java/net/irext/decode/sdk/bean/ACStatus.java
+++ b/private-backend/src/main/java/net/irext/decode/sdk/bean/ACStatus.java
@@ -24,7 +24,7 @@ public class ACStatus {
     private int acDisplay;
     private int acSleep;
     private int acTimer;
-    private int changeWindDir;
+    private Integer changeWindDir;
 
     public ACStatus() {
         this.acPower = Constants.ACPower.POWER_OFF.getValue();
@@ -39,7 +39,7 @@ public class ACStatus {
     }
 
     public ACStatus(int acPower, int acMode, int acTemp, int acWindSpeed, int acWindDir,
-                    int acDisplay, int acSleep, int acTimer, int changeWindDir) {
+                    int acDisplay, int acSleep, int acTimer, Integer changeWindDir) {
         this.acPower = acPower;
         this.acTemp = acTemp;
         this.acMode = acMode;
@@ -115,11 +115,11 @@ public class ACStatus {
         this.acTimer = acTimer;
     }
 
-    public int getChangeWindDir() {
+    public Integer getChangeWindDir() {
         return changeWindDir;
     }
 
-    public void setChangeWindDir(int changeWindDir) {
+    public void setChangeWindDir(Integer changeWindDir) {
         this.changeWindDir = changeWindDir;
     }
 }
diff --git a/private-backend/src/main/java/net/irext/server/businesslogic/OperationLogic.java b/private-backend/src/main/java/net/irext/server/businesslogic/OperationLogic.java
index c4fc99d..580c805 100644
--- a/private-backend/src/main/java/net/irext/server/businesslogic/OperationLogic.java
+++ b/private-backend/src/main/java/net/irext/server/businesslogic/OperationLogic.java
@@ -116,8 +116,7 @@ public class OperationLogic {
         return remoteIndex;
     }
 
-    public int[] decodeIR(RemoteIndex remoteIndex, ACStatus acStatus,
-                        int keyCode, int changeWindDirection) {
+    public int[] decodeIR(RemoteIndex remoteIndex, ACStatus acStatus, int keyCode) {
         try {
             int[] decoded = null;
             synchronized (this) {
diff --git a/private-backend/src/main/java/net/irext/server/request/DecodeRequest.java b/private-backend/src/main/java/net/irext/server/request/DecodeRequest.java
index 83a22b8..4e3fd32 100644
--- a/private-backend/src/main/java/net/irext/server/request/DecodeRequest.java
+++ b/private-backend/src/main/java/net/irext/server/request/DecodeRequest.java
@@ -17,11 +17,11 @@ public class DecodeRequest extends BaseRequest {
     private int indexId;
     private ACStatus acStatus;
     private int keyCode;
-    private int changeWindDir;
+    private Integer changeWindDir;
     private Integer directDecode;
     private Integer paraData;
 
-    public DecodeRequest(int indexId, ACStatus acStatus, int keyCode, int changeWindDir,
+    public DecodeRequest(int indexId, ACStatus acStatus, int keyCode, Integer changeWindDir,
                          Integer directDecode, Integer paraData) {
         this.indexId = indexId;
         this.acStatus = acStatus;
@@ -59,11 +59,11 @@ public class DecodeRequest extends BaseRequest {
         this.keyCode = keyCode;
     }
 
-    public int getChangeWindDir() {
+    public Integer getChangeWindDir() {
         return changeWindDir;
     }
 
-    public void setChangeWindDir(int changeWindDir) {
+    public void setChangeWindDir(Integer changeWindDir) {
         this.changeWindDir = changeWindDir;
     }
 
diff --git a/private-backend/src/main/java/net/irext/server/restapi/IROperationService.java b/private-backend/src/main/java/net/irext/server/restapi/IROperationService.java
index ea5a87c..3c0499f 100644
--- a/private-backend/src/main/java/net/irext/server/restapi/IROperationService.java
+++ b/private-backend/src/main/java/net/irext/server/restapi/IROperationService.java
@@ -147,10 +147,14 @@ public class IROperationService extends AbstractBaseService {
             int indexId = decodeRequest.getIndexId();
             ACStatus acStatus = decodeRequest.getAcStatus();
             int keyCode = decodeRequest.getKeyCode();
-            int changeWindDir = decodeRequest.getChangeWindDir();
+            Integer changeWindDir = decodeRequest.getChangeWindDir();
             Integer directDecode = decodeRequest.getDirectDecode();
             Integer paraData = decodeRequest.getParaData();
             RemoteIndex remoteIndex = null;
+
+            if (null == acStatus.getChangeWindDir() && null != changeWindDir) {
+                acStatus.setChangeWindDir(changeWindDir);
+            }
             int[] decoded = null;
             LoggerUtil.getInstance().trace(TAG, "decodeIR entry, keyCode = " + keyCode + ", acStatus = " +
                     new Gson().toJson(acStatus));
@@ -187,7 +191,7 @@ public class IROperationService extends AbstractBaseService {
                     }
                     // NOTE: here remoteIndex instances changes
                     remoteIndex = operationLogic.prepareBinary(remoteIndex.getId());
-                    decoded = operationLogic.decodeIR(remoteIndex, acStatus, keyCode, changeWindDir);
+                    decoded = operationLogic.decodeIR(remoteIndex, acStatus, keyCode);
                 }
             }
             response.setEntity(decoded);