diff --git a/n5coredll/LogUtil.cs b/n5coredll/LogUtil.cs
new file mode 100644
index 0000000..b4726dd
--- /dev/null
+++ b/n5coredll/LogUtil.cs
@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace n5coredll
+{
+    public class LogUtil
+    {
+        private static String mLogPath;
+        private static LogUtil mInstance;
+        public static LogUtil getInstance()
+        {
+            if (mInstance == null)
+                mInstance = new LogUtil();
+
+            return mInstance;
+        }
+
+        public void setLogPath(String logPath)
+        {
+            if (logPath.EndsWith(@"\"))
+                mLogPath = logPath;
+            else
+                mLogPath = logPath + @"\";
+        }
+
+        private String getCurLogFile()
+        {
+
+            StringBuilder txnIdSb = new StringBuilder();
+            DateTime dt = DateTime.Now;
+            return ("n5dll" + "_" + dt.ToString("yyyyMMdd") +".log");
+        }
+
+        public void addRepeatLog(string logInfo)
+        {
+            try
+            {
+                String path = mLogPath + getCurLogFile();
+                //path = @"C:\Users\rexli\AppData\Local\Temp\test.log";
+                if (!File.Exists(path))
+                {
+                    using (StreamWriter sw = File.CreateText(path))
+                    {
+                        sw.WriteLine(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:ffff") + " [LOGGER] " + logInfo);
+                        sw.Flush();
+                        sw.Close();
+                    }
+
+                }
+                else
+                {
+                    using (StreamWriter sw = File.AppendText(path))
+                    {
+                        sw.WriteLine(DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:ffff") + " [LOGGER] " + logInfo);
+                        sw.Flush();
+                        sw.Close();
+                    }
+                   
+                }
+                // Console.WriteLine(logInfo);
+
+            }
+            catch (Exception err)
+            {
+                Console.WriteLine("Exception = " + err);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/n5coredll/N5Core.cs b/n5coredll/N5Core.cs
index 2d910cc..d8c9125 100644
--- a/n5coredll/N5Core.cs
+++ b/n5coredll/N5Core.cs
@@ -1413,6 +1413,73 @@ namespace n5coredll
             return RequestResult.createRespErrJson("SETTLE_RESP", ERR_STATUS_TIMEOUT);
         }
 
+        public string sendParam()
+        {
+            if (ifBusy)
+                return RequestResult.createRespErrJson("PARAM_RESP", ERR_STATUS_BUSY);
+            ifBusy = true;
+            sendTime = 0;
+            isSending = false;
+            mRecvTimes = 0;
+            isReadyBack = false;
+            currReqByteArr = null;
+            currResultJsonStr = null;
+            RequestResult reqResult = null;
+            isGetACK = false;
+            if (openSerialPort())
+            {
+                currReqByteArr = this.packReqMsg(RequestResult.toJsonParam());
+                if (currReqByteArr == null || currReqByteArr.Length == 0)
+                {
+                    closeSerialPort();
+                    ifBusy = false;
+                    return RequestResult.createRespErrJson("PARAM_RESP", ERR_STATUS_PARAM);
+                    //return "Request failed: params error";
+                }
+
+                Console.WriteLine("currReqByteArr = " + currReqByteArr);
+                Console.WriteLine("currReqByteArr.Length = " + currReqByteArr.Length);
+                this.sendReqMsg();
+            }
+            else
+            {
+                ifBusy = false;
+                closeSerialPort();
+                return RequestResult.createRespErrJson("PARAM_RESP", ERR_STATUS_OPENCOM);
+            }
+
+            int sleepTime = timeOut / 1000;
+
+            DateTime startTime = DateTime.Now;
+
+            Boolean ifEnd = false;
+            while (!ifEnd)
+            {
+                DateTime nowTime = DateTime.Now;
+                TimeSpan sp = nowTime - startTime;
+                if (sp.TotalSeconds > sleepTime)
+                    ifEnd = true;
+                else
+                {
+                    if (!isSending && !isGetACK)
+                        this.resendReqMsg();
+                    if (isReadyBack)
+                    {
+                        closeSerialPort();
+                        if (currResultJsonStr != null && !"".Equals(currResultJsonStr))
+                        {
+                            ifBusy = false;
+                            return currResultJsonStr;
+                        }
+                    }
+                }
+            }
+
+            Console.WriteLine("Timeout return : " + DateTime.Now.ToString());
+            ifBusy = false;
+            return RequestResult.createRespErrJson("PARAM_RESP", ERR_STATUS_TIMEOUT);
+        }
+
         public string requestRetrieval(string txnId, int pTimeOut)
         {
             RetrievalResult retrievalResult = null;
@@ -2276,8 +2343,8 @@ namespace n5coredll
                             {
                                 Console.WriteLine("Check LRC success! LRC is [" + ObjectUtil.desToHex(new byte[] { nlrc }) + "]");
                                 sendAck();
-                                string jsonMsg = System.Text.Encoding.Default.GetString(msg);
-
+                                //string jsonMsg = System.Text.Encoding.Default.GetString(msg);
+                                string jsonMsg = System.Text.Encoding.UTF8.GetString(msg);
                                 onMsgReceived(jsonMsg);
                                 reset();
                                 return;
diff --git a/n5coredll/RequestResult.cs b/n5coredll/RequestResult.cs
index fe57b84..f874082 100644
--- a/n5coredll/RequestResult.cs
+++ b/n5coredll/RequestResult.cs
@@ -30,6 +30,11 @@ namespace n5coredll
             return "{\"EVENT_NAME\":\"SETTLE\"}";
         }
 
+        public static string toJsonParam()
+        {
+            return "{\"EVENT_NAME\":\"PARAM\",\"PAYMENT_APP_ID\":\"CC\"}";
+        }
+
         public static string toJsonForReprint()
         {
             return "{\"EVENT_NAME\":\"PRINT\",\"IS_REPRINT\":true}";
diff --git a/n5coredll/n5coredll.csproj b/n5coredll/n5coredll.csproj
index 1709a56..4fd4891 100644
--- a/n5coredll/n5coredll.csproj
+++ b/n5coredll/n5coredll.csproj
@@ -49,6 +49,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="LogUtil.cs" />
     <Compile Include="LoyaltyType.cs" />
     <Compile Include="N5Core.cs" />
     <Compile Include="N5PropertyOper.cs" />