diff --git a/project/Spoolend/include/modbus.h b/project/Spoolend/include/modbus.h
index 6121e3d..8cfc967 100644
--- a/project/Spoolend/include/modbus.h
+++ b/project/Spoolend/include/modbus.h
@@ -8,6 +8,7 @@
 
 /* Modbus 相关参数 */
 #define MODBUS_SLAVE_ADDRESS      0x34
+#define MODBUS_FUNCTION_CODE_01   0x01
 #define MODBUS_FUNCTION_CODE_03   0x03
 #define MODBUS_FUNCTION_CODE_06   0x06
 #define MODBUS_FUNCTION_CODE_10   0x10
diff --git a/project/Spoolend/modbus.c b/project/Spoolend/modbus.c
index 1b725e7..0d54abd 100644
--- a/project/Spoolend/modbus.c
+++ b/project/Spoolend/modbus.c
@@ -75,6 +75,9 @@ int Modbus_Slave_Check(char *_pBuffer, uint32_t _iSize)
 
     switch (func)
     {
+    case MODBUS_FUNCTION_CODE_01:
+        expected_len = 4;
+        break;
     case MODBUS_FUNCTION_CODE_03:
     case MODBUS_FUNCTION_CODE_06:
         expected_len = 8;
@@ -108,6 +111,8 @@ int Modbus_Slave_Check(char *_pBuffer, uint32_t _iSize)
     return expected_len;
 }
 
+extern TComCtrl *g_ptRS485_1;
+
 /*----------------------------------------------*
  * TComCtrl decode 回调                         *
  * 由 rd_ComRead 内部调用，处理完整 Modbus 帧   *
@@ -116,6 +121,7 @@ void Modbus_Slave_Decode(const char *_pBuffer, uint32_t _iSize)
 {
     uint16_t startAddress = 0;
     uint16_t registerCount = 0;
+    char *pVersion = NULL;
 
     RS485_1_Host_Existed = 1;
 
@@ -125,6 +131,10 @@ void Modbus_Slave_Decode(const char *_pBuffer, uint32_t _iSize)
 
     switch ((uint8_t)_pBuffer[1])
     {
+    case MODBUS_FUNCTION_CODE_01:
+        pVersion = Rd_GetBuildTime();
+        Modbus_SendResponse(g_ptRS485_1, (uint8_t *)pVersion, strlen(pVersion));
+        break;
     case MODBUS_FUNCTION_CODE_03:
         startAddress = ((uint8_t)_pBuffer[2] << 8) | (uint8_t)_pBuffer[3];
         registerCount = ((uint8_t)_pBuffer[4] << 8) | (uint8_t)_pBuffer[5];
@@ -226,7 +236,6 @@ static void Modbus_HandleFunction06(uint16_t registerAddress, uint16_t value)
     response[index++] = crc & 0xFF;
     response[index++] = (crc >> 8) & 0xFF;
 
-    extern TComCtrl *g_ptRS485_1;
     Modbus_SendResponse(g_ptRS485_1, response, index);
 }
 
@@ -266,7 +275,6 @@ static void Modbus_HandleFunction10(uint16_t startAddress, uint16_t registerCoun
     response[index++] = crc & 0xFF;
     response[index++] = (crc >> 8) & 0xFF;
 
-    extern TComCtrl *g_ptRS485_1;
     Modbus_SendResponse(g_ptRS485_1, response, index);
 }
 
@@ -275,7 +283,6 @@ static void Modbus_HandleFunction10(uint16_t startAddress, uint16_t registerCoun
  *----------------------------------------------*/
 static void Modbus_SendExceptionResponse(uint8_t exceptionCode)
 {
-    extern TComCtrl *g_ptRS485_1;
 
     response[0] = MODBUS_SLAVE_ADDRESS;
     response[1] = 0x80; //这里与原版差异为直接回复0x80而不是与一个功能码