diff --git a/DLPilot/release/DLPilot.exe b/DLPilot/release/DLPilot.exe
index a83e40e..df0ea12 100644
Binary files a/DLPilot/release/DLPilot.exe and b/DLPilot/release/DLPilot.exe differ
diff --git a/DLPilot/src/app_gui.py b/DLPilot/src/app_gui.py
index 2c93ee3..49b8980 100644
--- a/DLPilot/src/app_gui.py
+++ b/DLPilot/src/app_gui.py
@@ -771,6 +771,8 @@ class App(ctk.CTk):
                     else:
                         color = 'gray60'
                     self.lbl_dlpc_st.configure(text=text, text_color=color)
+                    if text.startswith(('已断开', '串口丢失')):
+                        self._serial_reset_state()
                 elif kind == 'temp':
                     if text.startswith('DMD'):
                         self.var_dmd.set(text)
@@ -829,6 +831,7 @@ class App(ctk.CTk):
     def _dlpc_toggle(self):
         if self.dlpc.is_connected():
             self.dlpc.close()
+            self._serial_reset_state()   # 断开时清序列/定时器/应答归位, 防旧账错配
             return
         port = self._dlpc_selected_port()
         if not port:
@@ -847,10 +850,28 @@ class App(ctk.CTk):
         config.save_slots(self.slots, self.area_var.get())   # 记住本次串口
         self.dlpc.open(port, baud, bytesize=bytesize, parity=parity, stopbits=stopbits)
 
+    def _serial_reset_state(self):
+        """断开/失连时清理进行中的序列与应答归位队列(不碰串口线程本身)"""
+        self._pd_seq.clear()
+        self._pwr_seq.clear()
+        for t in (self._pd_timer, self._pwr_timer):
+            if t:
+                try:
+                    self.after_cancel(t)
+                except Exception:
+                    pass
+        self._pd_timer = self._pwr_timer = None
+        self._tl_order.clear()
+
     def _dlpc_send(self, cmd):
         if not self.dlpc.is_connected():
             self.lbl_dlpc_st.configure(text='未连接串口', text_color='#E07A3F')
             return
+        if self._pd_seq or self._pwr_seq:
+            # 序列进行中: 手动命令的应答帧会被序列错认领(它不区分应答属于哪条
+            # 命令, 来一帧消费一步), 值会错位 —— 拒绝并提示, 序列结束再发
+            self._dlpc_log(f'序列进行中, 命令已忽略: {cmd}')
+            return
         self.dlpc.send(cmd)
 
     def _dlpc_send_preset(self):
diff --git a/DLPilot/src/dlpc_rs485.py b/DLPilot/src/dlpc_rs485.py
index 2d7c689..72fe4d1 100644
--- a/DLPilot/src/dlpc_rs485.py
+++ b/DLPilot/src/dlpc_rs485.py
@@ -290,7 +290,9 @@ class DLPC485:
                             port, baud, bytesize=bytesizes.get(dbsize, serial.EIGHTBITS),
                             parity=parities.get(parity, serial.PARITY_NONE),
                             stopbits=stopbits.get(sbits, serial.STOPBITS_ONE),
-                            timeout=0.15)
+                            timeout=0.15,
+                            write_timeout=1.0)   # 写超时: 转换器停滞时 write 会
+                                                 # 永久阻塞并卡死线程, 必须设上限
                         self.parser = FrameParser()
                         self._open_key = target
                         self.on_status(f'已连接 {port} @ {baud} '