diff --git a/Core/Inc/main.h b/Core/Inc/main.h
index 1d5ac61..e50431d 100644
--- a/Core/Inc/main.h
+++ b/Core/Inc/main.h
@@ -67,6 +67,8 @@ void Error_Handler(void);
 #define NET_RST_GPIO_Port GPIOD
 #define NET_CS_Pin GPIO_PIN_10
 #define NET_CS_GPIO_Port GPIOD
+#define HOST_485EN_Pin GPIO_PIN_12
+#define HOST_485EN_GPIO_Port GPIOD
 
 /* USER CODE BEGIN Private defines */
 
diff --git a/Core/Inc/stm32f1xx_it.h b/Core/Inc/stm32f1xx_it.h
index b82d7f3..e602ea5 100644
--- a/Core/Inc/stm32f1xx_it.h
+++ b/Core/Inc/stm32f1xx_it.h
@@ -59,6 +59,7 @@ void DMA1_Channel4_IRQHandler(void);
 void DMA1_Channel5_IRQHandler(void);
 void USART1_IRQHandler(void);
 void USART2_IRQHandler(void);
+void USART3_IRQHandler(void);
 /* USER CODE BEGIN EFP */
 
 /* USER CODE END EFP */
diff --git a/Core/Inc/usart.h b/Core/Inc/usart.h
index c54411d..4280d40 100644
--- a/Core/Inc/usart.h
+++ b/Core/Inc/usart.h
@@ -36,12 +36,15 @@ extern UART_HandleTypeDef huart1;
 
 extern UART_HandleTypeDef huart2;
 
+extern UART_HandleTypeDef huart3;
+
 /* USER CODE BEGIN Private defines */
 
 /* USER CODE END Private defines */
 
 void MX_USART1_UART_Init(void);
 void MX_USART2_UART_Init(void);
+void MX_USART3_UART_Init(void);
 
 /* USER CODE BEGIN Prototypes */
 
diff --git a/Core/Src/gpio.c b/Core/Src/gpio.c
index c13b02f..b421f07 100644
--- a/Core/Src/gpio.c
+++ b/Core/Src/gpio.c
@@ -62,6 +62,9 @@ void MX_GPIO_Init(void)
   /*Configure GPIO pin Output Level */
   HAL_GPIO_WritePin(GPIOD, NET_RST_Pin|NET_CS_Pin, GPIO_PIN_SET);
 
+  /*Configure GPIO pin Output Level */
+  HAL_GPIO_WritePin(HOST_485EN_GPIO_Port, HOST_485EN_Pin, GPIO_PIN_RESET);
+
   /*Configure GPIO pins : PE2 PE3 PE4 PE5
                            PE6 PE7 PE8 PE9
                            PE10 PE11 PE12 PE13
@@ -100,14 +103,12 @@ void MX_GPIO_Init(void)
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
   HAL_GPIO_Init(DIR2_GPIO_Port, &GPIO_InitStruct);
 
-  /*Configure GPIO pins : PB0 PB1 PB2 PB10
-                           PB11 PB12 PB3 PB4
-                           PB5 PB6 PB7 PB8
-                           PB9 */
-  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_10
-                          |GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_3|GPIO_PIN_4
-                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8
-                          |GPIO_PIN_9;
+  /*Configure GPIO pins : PB0 PB1 PB2 PB12
+                           PB3 PB4 PB5 PB6
+                           PB7 PB8 PB9 */
+  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_12
+                          |GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6
+                          |GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9;
   GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
@@ -124,21 +125,19 @@ void MX_GPIO_Init(void)
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   HAL_GPIO_Init(NET_INT_GPIO_Port, &GPIO_InitStruct);
 
-  /*Configure GPIO pins : NET_RST_Pin NET_CS_Pin */
-  GPIO_InitStruct.Pin = NET_RST_Pin|NET_CS_Pin;
+  /*Configure GPIO pins : NET_RST_Pin NET_CS_Pin HOST_485EN_Pin */
+  GPIO_InitStruct.Pin = NET_RST_Pin|NET_CS_Pin|HOST_485EN_Pin;
   GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
   HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
 
-  /*Configure GPIO pins : PD11 PD12 PD13 PD14
-                           PD15 PD0 PD1 PD2
-                           PD3 PD4 PD5 PD6
-                           PD7 */
-  GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14
-                          |GPIO_PIN_15|GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2
-                          |GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6
-                          |GPIO_PIN_7;
+  /*Configure GPIO pins : PD11 PD13 PD14 PD15
+                           PD0 PD1 PD2 PD3
+                           PD4 PD5 PD6 PD7 */
+  GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15
+                          |GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3
+                          |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
   GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
   HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
 
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 53aa946..654ae72 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -28,6 +28,7 @@
 #include "w5500_init.h"
 // #include "http_test.h"
 #include "http_server.h"
+#include "protocol.h"
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/
@@ -54,7 +55,13 @@
 /* Private function prototypes -----------------------------------------------*/
 void SystemClock_Config(void);
 /* USER CODE BEGIN PFP */
-
+void transDataToHost(uint8_t *data, uint16_t len)
+{
+  // 开启uart3 dma
+  HAL_GPIO_WritePin(HOST_485EN_GPIO_Port, HOST_485EN_Pin, GPIO_PIN_SET);
+  HAL_UART_Transmit(&huart3, data, len, 1000);
+  HAL_GPIO_WritePin(HOST_485EN_GPIO_Port, HOST_485EN_Pin, GPIO_PIN_RESET);
+}
 /* USER CODE END PFP */
 
 /* Private user code ---------------------------------------------------------*/
@@ -95,6 +102,7 @@ int main(void)
   MX_USART1_UART_Init();
   MX_USART2_UART_Init();
   MX_SPI2_Init();
+  MX_USART3_UART_Init();
   /* USER CODE BEGIN 2 */
   if(W5500_Init() != 0) {
     while(1)
@@ -111,6 +119,8 @@ int main(void)
   // http_test_request();
   HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
   printf("Init success!\r\n");
+  // transDataToHost("hello", 5);
+  runPumpDemo();
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -121,6 +131,7 @@ int main(void)
 
     /* USER CODE BEGIN 3 */
     http_server_task();
+    // transDataToHost("hello\r\n", 7);
     // HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
     // HAL_Delay(100);
   }
diff --git a/Core/Src/stm32f1xx_it.c b/Core/Src/stm32f1xx_it.c
index 33c0310..eb20716 100644
--- a/Core/Src/stm32f1xx_it.c
+++ b/Core/Src/stm32f1xx_it.c
@@ -59,6 +59,7 @@ extern DMA_HandleTypeDef hdma_usart1_rx;
 extern DMA_HandleTypeDef hdma_usart1_tx;
 extern UART_HandleTypeDef huart1;
 extern UART_HandleTypeDef huart2;
+extern UART_HandleTypeDef huart3;
 /* USER CODE BEGIN EV */
 
 /* USER CODE END EV */
@@ -257,6 +258,20 @@ void USART2_IRQHandler(void)
   /* USER CODE END USART2_IRQn 1 */
 }
 
+/**
+  * @brief This function handles USART3 global interrupt.
+  */
+void USART3_IRQHandler(void)
+{
+  /* USER CODE BEGIN USART3_IRQn 0 */
+
+  /* USER CODE END USART3_IRQn 0 */
+  HAL_UART_IRQHandler(&huart3);
+  /* USER CODE BEGIN USART3_IRQn 1 */
+
+  /* USER CODE END USART3_IRQn 1 */
+}
+
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
diff --git a/Core/Src/usart.c b/Core/Src/usart.c
index 5518f08..5d217b1 100644
--- a/Core/Src/usart.c
+++ b/Core/Src/usart.c
@@ -26,6 +26,7 @@
 
 UART_HandleTypeDef huart1;
 UART_HandleTypeDef huart2;
+UART_HandleTypeDef huart3;
 DMA_HandleTypeDef hdma_usart1_rx;
 DMA_HandleTypeDef hdma_usart1_tx;
 
@@ -86,6 +87,35 @@ void MX_USART2_UART_Init(void)
 
   /* USER CODE END USART2_Init 2 */
 
+}
+/* USART3 init function */
+
+void MX_USART3_UART_Init(void)
+{
+
+  /* USER CODE BEGIN USART3_Init 0 */
+
+  /* USER CODE END USART3_Init 0 */
+
+  /* USER CODE BEGIN USART3_Init 1 */
+
+  /* USER CODE END USART3_Init 1 */
+  huart3.Instance = USART3;
+  huart3.Init.BaudRate = 115200;
+  huart3.Init.WordLength = UART_WORDLENGTH_8B;
+  huart3.Init.StopBits = UART_STOPBITS_1;
+  huart3.Init.Parity = UART_PARITY_NONE;
+  huart3.Init.Mode = UART_MODE_TX_RX;
+  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
+  if (HAL_UART_Init(&huart3) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  /* USER CODE BEGIN USART3_Init 2 */
+
+  /* USER CODE END USART3_Init 2 */
+
 }
 
 void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
@@ -185,6 +215,36 @@ void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
 
   /* USER CODE END USART2_MspInit 1 */
   }
+  else if(uartHandle->Instance==USART3)
+  {
+  /* USER CODE BEGIN USART3_MspInit 0 */
+
+  /* USER CODE END USART3_MspInit 0 */
+    /* USART3 clock enable */
+    __HAL_RCC_USART3_CLK_ENABLE();
+
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    /**USART3 GPIO Configuration
+    PB10     ------> USART3_TX
+    PB11     ------> USART3_RX
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_10;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+    GPIO_InitStruct.Pin = GPIO_PIN_11;
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+    /* USART3 interrupt Init */
+    HAL_NVIC_SetPriority(USART3_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USART3_IRQn);
+  /* USER CODE BEGIN USART3_MspInit 1 */
+
+  /* USER CODE END USART3_MspInit 1 */
+  }
 }
 
 void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
@@ -234,6 +294,26 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
 
   /* USER CODE END USART2_MspDeInit 1 */
   }
+  else if(uartHandle->Instance==USART3)
+  {
+  /* USER CODE BEGIN USART3_MspDeInit 0 */
+
+  /* USER CODE END USART3_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_USART3_CLK_DISABLE();
+
+    /**USART3 GPIO Configuration
+    PB10     ------> USART3_TX
+    PB11     ------> USART3_RX
+    */
+    HAL_GPIO_DeInit(GPIOB, GPIO_PIN_10|GPIO_PIN_11);
+
+    /* USART3 interrupt Deinit */
+    HAL_NVIC_DisableIRQ(USART3_IRQn);
+  /* USER CODE BEGIN USART3_MspDeInit 1 */
+
+  /* USER CODE END USART3_MspDeInit 1 */
+  }
 }
 
 /* USER CODE BEGIN 1 */
diff --git a/f1CTL.ioc b/f1CTL.ioc
index 08f2ddd..6e4da79 100644
--- a/f1CTL.ioc
+++ b/f1CTL.ioc
@@ -35,27 +35,31 @@ Mcu.IP3=SPI2
 Mcu.IP4=SYS
 Mcu.IP5=USART1
 Mcu.IP6=USART2
-Mcu.IPNb=7
+Mcu.IP7=USART3
+Mcu.IPNb=8
 Mcu.Name=STM32F103V(C-D-E)Tx
 Mcu.Package=LQFP100
 Mcu.Pin0=OSC_IN
 Mcu.Pin1=OSC_OUT
-Mcu.Pin10=PD9
-Mcu.Pin11=PD10
-Mcu.Pin12=PA9
-Mcu.Pin13=PA10
-Mcu.Pin14=PA13
-Mcu.Pin15=PA14
-Mcu.Pin16=VP_SYS_VS_Systick
+Mcu.Pin10=PB15
+Mcu.Pin11=PD8
+Mcu.Pin12=PD9
+Mcu.Pin13=PD10
+Mcu.Pin14=PD12
+Mcu.Pin15=PA9
+Mcu.Pin16=PA10
+Mcu.Pin17=PA13
+Mcu.Pin18=PA14
+Mcu.Pin19=VP_SYS_VS_Systick
 Mcu.Pin2=PA1
 Mcu.Pin3=PA2
 Mcu.Pin4=PA3
 Mcu.Pin5=PE15
-Mcu.Pin6=PB13
-Mcu.Pin7=PB14
-Mcu.Pin8=PB15
-Mcu.Pin9=PD8
-Mcu.PinsNb=17
+Mcu.Pin6=PB10
+Mcu.Pin7=PB11
+Mcu.Pin8=PB13
+Mcu.Pin9=PB14
+Mcu.PinsNb=20
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32F103VCTx
@@ -75,6 +79,7 @@ NVIC.SVCall_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 NVIC.SysTick_IRQn=true\:15\:0\:false\:false\:true\:false\:true\:false
 NVIC.USART1_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.USART2_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
+NVIC.USART3_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.UsageFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 OSC_IN.Mode=HSE-External-Oscillator
 OSC_IN.Signal=RCC_OSC_IN
@@ -96,6 +101,10 @@ PA3.Mode=Asynchronous
 PA3.Signal=USART2_RX
 PA9.Mode=Asynchronous
 PA9.Signal=USART1_TX
+PB10.Mode=Asynchronous
+PB10.Signal=USART3_TX
+PB11.Mode=Asynchronous
+PB11.Signal=USART3_RX
 PB13.Mode=Full_Duplex_Master
 PB13.Signal=SPI2_SCK
 PB14.Mode=Full_Duplex_Master
@@ -107,6 +116,10 @@ PD10.GPIO_Label=NET_CS
 PD10.Locked=true
 PD10.PinState=GPIO_PIN_SET
 PD10.Signal=GPIO_Output
+PD12.GPIOParameters=GPIO_Label
+PD12.GPIO_Label=HOST_485EN
+PD12.Locked=true
+PD12.Signal=GPIO_Output
 PD8.GPIOParameters=GPIO_Label
 PD8.GPIO_Label=NET_INT
 PD8.Locked=true
@@ -187,6 +200,8 @@ USART1.IPParameters=VirtualMode
 USART1.VirtualMode=VM_ASYNC
 USART2.IPParameters=VirtualMode
 USART2.VirtualMode=VM_ASYNC
+USART3.IPParameters=VirtualMode
+USART3.VirtualMode=VM_ASYNC
 VP_SYS_VS_Systick.Mode=SysTick
 VP_SYS_VS_Systick.Signal=SYS_VS_Systick
 board=custom