diff --git a/app/src/main/cpp/GPIOControl.cpp b/app/src/main/cpp/GPIOControl.cpp
index e17bd754..bef5b2ab 100644
--- a/app/src/main/cpp/GPIOControl.cpp
+++ b/app/src/main/cpp/GPIOControl.cpp
@@ -198,6 +198,30 @@ size_t GpioControl::TurnOn(const std::vector<int>& cmds)
     return 0;
 }
 
+size_t GpioControl::TurnOffImmediately(int cmd)
+{
+    time_t ts = time(NULL) + 2;
+    size_t ref = 0;
+    std::vector<ITEM>::iterator it;
+    m_locker.lock();
+    for (it = m_items.begin(); it != m_items.end(); ++it)
+    {
+        if (it->cmd == cmd)
+        {
+            ref = it->references;
+            it->closeCmds++;
+            it->closeTime = ts;
+            break;
+        }
+    }
+    m_locker.unlock();
+    m_semaphore.release();
+#ifdef _DEBUG
+    ALOGI("PWR TurnOffNow cmd=%d ref=%u", cmd, (uint32_t)ref);
+#endif
+    return 0;
+}
+
 size_t GpioControl::TurnOff(int cmd, uint32_t delayedCloseTime/* = 0*/)
 {
     time_t ts = 0;
diff --git a/app/src/main/cpp/GPIOControl.h b/app/src/main/cpp/GPIOControl.h
index 8083e095..2918d61e 100644
--- a/app/src/main/cpp/GPIOControl.h
+++ b/app/src/main/cpp/GPIOControl.h
@@ -177,6 +177,7 @@ public:
     static size_t TurnOff(int cmd, uint32_t delayedCloseTime = 0);
     static size_t TurnOff(const std::vector<int>& cmds, uint32_t delayedCloseTime = 0);
     static size_t TurnOff(const std::vector<std::pair<int, uint32_t> >& cmds);
+    static size_t TurnOffImmediately(int cmd);
 
     static void PowerControlThreadProc();
 
@@ -532,7 +533,24 @@ public:
 #ifdef USING_PLZ
             PowerControl(CMD_SET_PTZ_PWR_ENABLE, CMD_SET_100M_ENABLE, CMD_SET_100M_SWITCH_PWR_ENABLE, CMD_SET_12V_EN_STATE, closeDelayTime)
 #else // USING_PLZ
-    PowerControl(CMD_SET_OTG_STATE, CMD_SET_12V_EN_STATE, closeDelayTime)
+            PowerControl(CMD_SET_OTG_STATE, CMD_SET_12V_EN_STATE, closeDelayTime)
+#endif // USING_PLZ
+#endif // USING_N938
+    {
+    }
+};
+
+class SerialCameraPowerCtrl : public PowerControl
+{
+public:
+    SerialCameraPowerCtrl(uint32_t closeDelayTime) :
+#ifdef USING_N938
+            PowerControl(CMD_SET_SPI_POWER, CMD_SPI2SERIAL_POWER_EN, CMD_RS485_3V3_EN, CMD_SET_PIC1_POWER, CMD_SET_485_EN4, closeDelayTime)
+#else // USING_N938
+#ifdef USING_PLZ
+            PowerControl(CMD_SET_12V_EN_STATE, CMD_SET_485_ENABLE, CMD_SET_3V3_PWR_EN, CMD_SET_SPI_POWER, CMD_SET_PTZ_PWR_ENABLE, closeDelayTime)
+#else // USING_PLZ
+            PowerControl(CMD_SET_12V_EN_STATE, CMD_SET_3V3_PWR_EN, CMD_SET_SPI_POWER, CMD_SET_485_EN_STATE, closeDelayTime)
 #endif // USING_PLZ
 #endif // USING_N938
     {
diff --git a/app/src/main/cpp/PhoneDevice.cpp b/app/src/main/cpp/PhoneDevice.cpp
index 25f9fccf..04485234 100644
--- a/app/src/main/cpp/PhoneDevice.cpp
+++ b/app/src/main/cpp/PhoneDevice.cpp
@@ -4171,19 +4171,36 @@ bool CPhoneDevice::CloseSensors(int sensortype, uint32_t delayedCloseTime)
     }
     if(sensortype == CAMERA_SENSOR_OPEN)
     {
+        if(delayedCloseTime ==0)
+        {
 #ifdef USING_N938
-        GpioControl::TurnOff(CMD_SET_PIC1_POWER, delayedCloseTime);
-        GpioControl::TurnOff(CMD_SET_485_EN4, delayedCloseTime);
+            GpioControl::TurnOffImmediately(CMD_SET_PIC1_POWER);
+            GpioControl::TurnOffImmediately(CMD_SET_485_EN4);
+#endif
+
+#ifndef USING_N938
+            // GpioControl::TurnOff(CMD_SET_3V3_PWR_ENABLE);
+#ifndef USING_PLZ
+#else
+            GpioControl::TurnOffImmediately(CMD_SET_PTZ_PWR_ENABLE);
+#endif
+#endif
+        }else
+        {
+#ifdef USING_N938
+            GpioControl::TurnOff(CMD_SET_PIC1_POWER, delayedCloseTime);
+            GpioControl::TurnOff(CMD_SET_485_EN4, delayedCloseTime);
 //        GpioControl::TurnOff(CMD_SET_CAM_3V3_EN_STATE);
 #endif
 
 #ifndef USING_N938
-        // GpioControl::TurnOff(CMD_SET_3V3_PWR_ENABLE);
-        #ifndef USING_PLZ
-        #else
-        GpioControl::TurnOff(CMD_SET_PTZ_PWR_ENABLE, delayedCloseTime);
-        #endif
+            // GpioControl::TurnOff(CMD_SET_3V3_PWR_ENABLE);
+#ifndef USING_PLZ
+#else
+            GpioControl::TurnOff(CMD_SET_PTZ_PWR_ENABLE, delayedCloseTime);
+#endif
 #endif
+        }
     }
     if(sensortype == WEATHER_SENSOR_OPEN )
     {