diff --git a/modbus/modbus_block_host.cpp b/modbus/modbus_block_host.cpp
index 8eb0aab..c3712c6 100644
--- a/modbus/modbus_block_host.cpp
+++ b/modbus/modbus_block_host.cpp
@@ -6,9 +6,10 @@ using namespace iflytop;
 ModbusBlockHost::ModbusBlockHost() {}
 ModbusBlockHost::~ModbusBlockHost() {}
 
-
-void ModbusBlockHost::initialize(UART_HandleTypeDef *huart) {
+void ModbusBlockHost::initialize(UART_HandleTypeDef *huart, Pin_t rePin) {
   this->huart = huart;
+  this->rePin = rePin;
+  txEnGpio.initAsOutput(rePin, kxs_gpio_pulldown, false, false);
   m_modbus_lock.init();
 }
 void ModbusBlockHost::enableDump(bool enable) { m_dump = enable; }
@@ -31,13 +32,14 @@ void ModbusBlockHost::uarttx(uint8_t *buff, size_t len) {
   }
   // HAL_UART_Transmit(huart, buff, len, 1000);
   HAL_UART_DMAStop(huart);
+  if (rePin != PinNull) txEnGpio.setState(true);
   HAL_StatusTypeDef ret = HAL_UART_Transmit_DMA(huart, buff, len);
   ZASSERT(ret == HAL_OK);
 
-  // 等待DMA传输完成
   while (true) {
     if (HAL_UART_GetState(huart) == HAL_UART_STATE_READY) break;
   }
+  if (rePin != PinNull) txEnGpio.setState(false);
   return;
 }
 bool ModbusBlockHost::uartrx(uint8_t *buff, size_t len, int overtimems) {
@@ -182,7 +184,7 @@ bool ModbusBlockHost::writeReg10(uint8_t slaveAddr, uint16_t regAddr, uint16_t r
   txbuff[3] = regAddr & 0xff;
   txbuff[4] = 0x00;
   txbuff[5] = 0x01;
-  txbuff[6] = 0x02;  // 字节数
+  txbuff[6] = 0x02;  //
   txbuff[7] = regVal >> 8;
   txbuff[8] = regVal & 0xff;
   modbus_pack_crc_to_packet(txbuff, 9 + 2);
diff --git a/modbus/modbus_block_host.hpp b/modbus/modbus_block_host.hpp
index fbf3a0a..7d394f2 100644
--- a/modbus/modbus_block_host.hpp
+++ b/modbus/modbus_block_host.hpp
@@ -12,12 +12,15 @@ class ModbusBlockHost {
 
   zmutex m_modbus_lock = {"m_modbus_lock"};
   bool   m_dump        = false;
+  Pin_t  rePin = PinNull;
+
+  ZGPIO txEnGpio;
 
  public:
   ModbusBlockHost();
   ~ModbusBlockHost();
 
-  void initialize(UART_HandleTypeDef *huart);
+  void initialize(UART_HandleTypeDef *huart, Pin_t rePin = PinNull);
   void enableDump(bool enable);
 
   bool readReg03(uint8_t slaveAddr, uint16_t regAddr, uint16_t *regVal, int overtimems);