diff --git a/Core/Src/main.c b/Core/Src/main.c
index 79998a7..313cc53 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -104,6 +104,8 @@ int main(void)
 
   MX_USART1_UART_Init();
 
+
+
   /* USER CODE END 2 */
 
   sts_sensor_o3_t o3_data;
@@ -116,6 +118,8 @@ int main(void)
 		  sts_aq_o3_query(&o3_data);
 		  printf("\r\n cycle %d: o3 =%4d %s : %.2f mg/m3 \r\n", i, o3_data.o3_ppb, (o3_data.o3_unit==0x04)?"ppb":"non", o3_data.o3_mg_per_m3);
 		  HAL_Delay(4000);
+		  HAL_Delay(4000);
+		  HAL_Delay(4000);
 	  } while (i++ <20);
 
   }
diff --git a/Core/Src/sts_aq_o3.c b/Core/Src/sts_aq_o3.c
index b55ae22..c27fe52 100644
--- a/Core/Src/sts_aq_o3.c
+++ b/Core/Src/sts_aq_o3.c
@@ -39,7 +39,7 @@ void sts_aq_o3_init(void)
 int sts_aq_o3_start_autony_mode(void)
 {
 	printf("change to autony mode\r\n");
-	if (HAL_UART_Transmit(&huart1, (uint8_t *)autonymode, 9, 5000) != HAL_OK)
+	if (HAL_UART_Transmit_IT(&huart1, (uint8_t *)autonymode, 9) != HAL_OK)
     {
 	  	  printf("\r\n Transmit anony mode failure \r\n");
 	  	  return -1;
@@ -50,7 +50,7 @@ int sts_aq_o3_start_autony_mode(void)
 int sts_aq_o3_start_pooling_mode(void)
 {
 	printf("change to querymode\r\n");
-	if (HAL_UART_Transmit(&huart1, (uint8_t *)querymode, 9, 5000) != HAL_OK)
+	if (HAL_UART_Transmit_IT(&huart1, (uint8_t *)querymode, 9) != HAL_OK)
     {
 	  	  printf("\r\n Transmit pooling mode failure \r\n");
 	  	  return -1;
@@ -61,7 +61,7 @@ int sts_aq_o3_start_pooling_mode(void)
 void sts_aq_o3_autony_run_mode(sts_sensor_o3_t *sts_sensor_data)
 {
 	  	  /*##-1- Put UART peripheral in reception process ###########################*/
-	  	  if (HAL_UART_Receive(&huart1, (uint8_t *)aRxBuffer, 9, 0x5000) != HAL_OK)
+	  	  if (HAL_UART_Receive_IT(&huart1, (uint8_t *)aRxBuffer, 9) != HAL_OK)
 	  	  {
 	  		  printf("\r\n Transmit receiving data failure \r\n");
 	  	  }
@@ -81,19 +81,26 @@ void sts_aq_o3_autony_run_mode(sts_sensor_o3_t *sts_sensor_data)
 
 int sts_aq_o3_query(sts_sensor_o3_t *sts_sensor_data)
 {
-	  if (HAL_UART_Transmit(&huart1, (uint8_t *)queryonce, 9, 5000) != HAL_OK)
+	uint8_t  i=0;
+	  if (HAL_UART_Transmit_IT(&huart1, (uint8_t *)queryonce, 9) != HAL_OK)
 	  {
 		  printf("\r\n Transmit query once failure \r\n");
 		  return -1;
+	  } else {
+		  printf("\r\n Query cmd sent out = ");
+		  for (i=0; i< sizeof(queryonce); i++)
+			  printf("%02x ",*(queryonce+i));
 	  }
 
-	  if (HAL_UART_Receive(&huart1, (uint8_t *)aRxBuffer, 9, 0x5000) != HAL_OK)
+	  if (HAL_UART_Receive_IT(&huart1, (uint8_t *)aRxBuffer, 9) != HAL_OK)
 	  {
-		  printf("\r\n Transmit receiving data failure \r\n");
+		  printf("\r\n UART Receiving data failure \r\n");
 		  return -2;
+	  } else {
+		  printf("\r\n UART Receiving data  \r\n");
 	  }
 
-	  printf("\n Sensor data = ");
+	  printf("\n Received data = ");
 	  for (uint8_t j=0; j<sizeof(aRxBuffer); j++)
 	  printf(" %02x ",aRxBuffer[j]);
 
diff --git a/STM32CubeIDE/Release/WL55JC_AS923.elf b/STM32CubeIDE/Release/WL55JC_AS923.elf
index f548077..c7360a9 100644
Binary files a/STM32CubeIDE/Release/WL55JC_AS923.elf and b/STM32CubeIDE/Release/WL55JC_AS923.elf differ