diff --git a/De70Cmdv2.cs b/De70Cmdv2.cs
index 820dda9..dd2582c 100644
--- a/De70Cmdv2.cs
+++ b/De70Cmdv2.cs
@@ -1579,27 +1579,20 @@
     public class Com232C
     {
         SerialPort serialPort = null;
-        public static int prevState = 0;
+
         public Com232C(SerialPort _serialPort)
         {
             this.serialPort = _serialPort;
         }
         public byte send_dat(byte[] buf, int size)
         {
-            
-            //Debug.WriteLine(DE70_CMD.ByteArrayToString(buf, 0, size));
-            AppData.DeviceStatus.CDMStatus = (int)CDMStatusCode.NORMAL;
-            //AppData.CDMSTATE.CDMStatus = "DE: OK";
-            byte bResult = Constants.E_NG;
             try
             {
                 serialPort.Write(buf, 0, size);
-                bResult= Constants.E_OK;
+                return Constants.E_OK;
             }
             catch (Exception e)
             {
-                AppData.DeviceStatus.CDMStatus = (int)CDMStatusCode.DISCONNECT_SERIALPORT;
-                AppData.CDMSTATE.CDMStatus = "DE: LỖI";
                 try
                 {
                     Log.Fatal(e, "DE70_send_dat");
@@ -1609,18 +1602,12 @@
                 }
                 catch (Exception e2)
                 {
-                    Log.Fatal(e2,"DE70_send_dat2");
+                    Log.Fatal(e2, "DE70_send_dat2");
                 }
-            }
-            if(AppData.DeviceStatus.CDMStatus!=prevState)
-            {
-                APIModels.SendEvent(AppData.DeviceStatus);
-                prevState = AppData.DeviceStatus.CDMStatus;
-            }    
 
+            }
             // Implement serial communication send function
-           
-            return bResult;
+            return Constants.E_NG;
         }
 
         public int rcv_dat(byte[] buf, int pos, int size)
diff --git a/DepositSMUCv2.xaml.cs b/DepositSMUCv2.xaml.cs
index 15ce996..05fcac7 100644
--- a/DepositSMUCv2.xaml.cs
+++ b/DepositSMUCv2.xaml.cs
@@ -384,6 +384,7 @@ namespace SafeBagDE70
         }
         int prevPrinterStatus = -1;
         int prevSensorStatus = -1;
+        int prevCDMState = -1;
         private void SensorTimer_Tick(object? sender, EventArgs e)
         {
             sensorTimer.IsEnabled = false;
@@ -394,10 +395,7 @@ namespace SafeBagDE70
                 if (countSensorTimer % 10 == 0)
                 {
                     GetPrinterStatus();
-                    if(!AppData.IsInTransaction)
-                    {
-                        AppData.GetCDMState();
-                    }    
+                    GetCDMStatus();
 
                     AppData.DeviceStatus.Description = AppData.CDMSTATE.CDMStatus;
                     AppData.DeviceStatus.DeviceTime = DateTime.Now;
@@ -423,6 +421,28 @@ namespace SafeBagDE70
             sensorTimer.IsEnabled = true;
         }
 
+        private void GetCDMStatus()
+        {
+            if (!AppData.IsInTransaction)
+            {
+                AppData.GetCDMState();
+                if (cCmdRsp.recv_dat.ret != Constants.E_OK)
+                {
+                    AppData.CDMSTATE.CDMStatus = "CDM: LỖI";
+                    AppData.DeviceStatus.CDMStatus = (int)CDMStatusCode.DISCONNECT_SERIALPORT;
+                }
+                else
+                {
+                    AppData.DeviceStatus.CDMStatus = (int)CDMStatusCode.NORMAL;
+                }
+                if (AppData.DeviceStatus.CDMStatus != prevCDMState)
+                {
+                    prevCDMState = AppData.DeviceStatus.CDMStatus;
+                    APIModels.SendEvent(AppData.DeviceStatus);
+                }
+            }
+        }
+
         private void GetPrinterStatus()
         {
             var status = printerManager.GetStatus();