diff --git a/BLE/DLD154Pro_Peripheral_28K/APP/include/rs485_700bs.h b/BLE/DLD154Pro_Peripheral_28K/APP/include/rs485_700bs.h
index db00708..5b598c1 100644
--- a/BLE/DLD154Pro_Peripheral_28K/APP/include/rs485_700bs.h
+++ b/BLE/DLD154Pro_Peripheral_28K/APP/include/rs485_700bs.h
@@ -11,8 +11,8 @@
 
 /* 协议常量 */
 #define RS485_BAUD          9600
-#define RS485_HEARTBEAT_MS  5000      // 空闲心跳 5s
-#define RS485_FAULT_MS      1000      // 故障心跳 1s
+#define RS485_HEARTBEAT_MS  1000      // 空闲心跳 5s (1000 tick × 5ms/tick)
+#define RS485_FAULT_MS      200       // 故障心跳 1s (200 tick × 5ms/tick)
 #define RS485_MAX_FRAME     10        // 最大帧长
 
 /* 命令码 (主机→从机) */