Index: libindi/drivers/video/v4l2driver.cpp
===================================================================
--- libindi/drivers/video/v4l2driver.cpp	(revision 1596)
+++ libindi/drivers/video/v4l2driver.cpp	(working copy)
@@ -63,7 +63,7 @@
    addDebugControl();
 
  /* Port */
-  IUFillText(&PortT[0], "PORT", "Port", "/dev/video0");
+  IUFillText(&PortT[0], "PORT", "Port", "/dev/video1");
   IUFillTextVector(&PortTP, PortT, NARRAY(PortT), getDeviceName(), "DEVICE_PORT", "Ports", OPTIONS_TAB, IP_RW, 0, IPS_IDLE);
 
  /* Video Stream */
@@ -614,12 +614,17 @@
       frameCount=0;
       gettimeofday(&capture_start, NULL);
       if (lx->isenabled()) {
-	//startlongexposure(ExposeTimeN[0].value);
-	rc=startlongexposure(V4LFrame->expose);
+		rc=startlongexposure(V4LFrame->expose);
         if (rc == false)
-	  DEBUG(INDI::Logger::DBG_WARNING, "Unable to start long exposure, falling back to auto exposure.");
-      } else
-	v4l_base->start_capturing(errmsg);
+			DEBUG(INDI::Logger::DBG_WARNING, "Unable to start long exposure, falling back to auto exposure.");
+		else {
+			if( lx->getLxmode() == LXSERIAL ) {
+				v4l_base->start_capturing( errmsg ); 
+			}
+		}
+	  }
+	  else
+		v4l_base->start_capturing(errmsg);
       
       ExposeTimeNP->s   = IPS_BUSY;
       if (IUUpdateNumber(ExposeTimeNP, values, names, n) < 0)
@@ -706,6 +711,7 @@
 bool V4L2_Driver::startlongexposure(double timeinsec)
 {
   lxtimer=IEAddTimer((int)(timeinsec*1000.0), (IE_TCF *)lxtimerCallback, this);
+  v4l_base->setlxstate( LX_ACCUMULATING );
   return (lx->startLx());
 }
 
@@ -714,8 +720,10 @@
   char errmsg[ERRMSGSIZ];
   V4L2_Driver *p = (V4L2_Driver *)userpointer;
   p->lx->stopLx();
+  p->v4l_base->setlxstate( LX_TRIGGERED );
   IERmTimer(p->lxtimer);
-  p->v4l_base->start_capturing(errmsg); // jump to new/updateFrame
+  if( !p->v4l_base->isstreamactive() )
+	p->v4l_base->start_capturing(errmsg); // jump to new/updateFrame
 }
 
 bool V4L2_Driver::UpdateCCDBin(int hor, int ver)
Index: libindi/drivers/video/v4l2driver.h
===================================================================
--- libindi/drivers/video/v4l2driver.h	(revision 1596)
+++ libindi/drivers/video/v4l2driver.h	(working copy)
@@ -66,7 +66,6 @@
 
 #define TEMPFILE_LEN	16
 
-
 class V4L2_Driver: public INDI::CCD
 {
   public:
@@ -85,7 +84,7 @@
 
     static void newFrame(void *p);
     void updateFrame();
-
+    
    protected:
 
     virtual bool Connect();
@@ -191,6 +190,7 @@
    int lxtimer;
    bool startlongexposure(double timeinsec);
    static void lxtimerCallback(void *userpointer);
+   short lxstate;
 };
    
 #endif
Index: libindi/libs/lx/Lx.cpp
===================================================================
--- libindi/libs/lx/Lx.cpp	(revision 1596)
+++ libindi/libs/lx/Lx.cpp	(working copy)
@@ -38,10 +38,10 @@
   //IUFillSwitch(&LxModeS[LXGPIO], "GPIO (Arm/RPI)", "", ISS_OFF);
   //  IUFillSwitch(&LxModeS[4], "IndiDuino Switcher", "", ISS_OFF); // Snooping is not enough
   IUFillSwitchVector(&LxModeSP, LxModeS, NARRAY(LxModeS), device_name, "LX Mode", "", LX_TAB, IP_RW, ISR_1OFMANY, 0, IPS_IDLE);
-  IUFillText(&LxPortT[0], "Port", "", "/dev/ttyS0");
+  IUFillText(&LxPortT[0], "Port", "", "/dev/ttyUSB0");
   IUFillTextVector(&LxPortTP, LxPortT, NARRAY(LxPortT), device_name, "Lx port", "", LX_TAB, IP_RW, 0, IPS_IDLE);
-  IUFillSwitch(&LxSerialOptionS[0], "Use DTR (pin 4)", "", ISS_ON);
-  IUFillSwitch(&LxSerialOptionS[1], "Use RTS (pin 7)", "", ISS_OFF);
+  IUFillSwitch(&LxSerialOptionS[0], "Use DTR (pin 4)", "", ISS_OFF);
+  IUFillSwitch(&LxSerialOptionS[1], "Use RTS (pin 7)", "", ISS_ON);
   IUFillSwitch(&LxSerialOptionS[2], "Use Serial command", "", ISS_OFF);
   IUFillSwitchVector(&LxSerialOptionSP, LxSerialOptionS, NARRAY(LxSerialOptionS), device_name, "Serial Options", "", LX_TAB, IP_RW, ISR_1OFMANY, 0, IPS_IDLE);
   IUFillSwitch(&LxParallelOptionS[0], "Use Data 0 (pin 2)", "", ISS_OFF);
@@ -285,6 +285,10 @@
   return true; // not ours, don't care
 }
 
+unsigned int Lx::getLxmode() {
+	return IUFindOnSwitchIndex(&LxModeSP);   
+}
+
 bool Lx::startLx() {
   unsigned int index;
   IDMessage(device_name, "Starting Long Exposure");
Index: libindi/libs/lx/Lx.h
===================================================================
--- libindi/libs/lx/Lx.h	(revision 1596)
+++ libindi/libs/lx/Lx.h	(working copy)
@@ -57,7 +57,9 @@
 bool updateProperties();
 bool startLx();
 int stopLx();
+unsigned int getLxmode();
 
+
 private:
 INDI::DefaultDevice *dev;
 const char *device_name;
Index: libindi/libs/webcam/v4l2_base.cpp
===================================================================
--- libindi/libs/webcam/v4l2_base.cpp	(revision 1596)
+++ libindi/libs/webcam/v4l2_base.cpp	(working copy)
@@ -320,9 +320,15 @@
 		if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))
 		  return errno_exit ("ReadFrame IO_METHOD_MMAP: VIDIOC_QBUF", errmsg);
 
+		if( lxstate == LX_ACTIVE ) {
+
                 /* Call provided callback function if any */
                  if (callback)
                 	(*callback)(uptr);
+		}
+		
+		if( lxstate == LX_TRIGGERED )
+			lxstate = LX_ACTIVE;
 
 		break;
 
@@ -399,6 +405,7 @@
 	if (cropset && cropbuf) {
 	  free(cropbuf); cropbuf=NULL;
 	}
+	streamactive = false;
    return 0;
 }
 
@@ -438,7 +445,8 @@
 
                 
 
-                selectCallBackID = IEAddCallback(fd, newFrame, this);
+        selectCallBackID = IEAddCallback(fd, newFrame, this);
+        streamactive = true;
 
 		break;
 
@@ -952,6 +960,8 @@
 
         allocBuffers();
 
+	lxstate = LX_ACTIVE;
+
 	switch (io)
         {
 	case IO_METHOD_READ:
Index: libindi/libs/webcam/v4l2_base.h
===================================================================
--- libindi/libs/webcam/v4l2_base.h	(revision 1596)
+++ libindi/libs/webcam/v4l2_base.h	(working copy)
@@ -32,6 +32,13 @@
 
 #define VIDEO_COMPRESSION_LEVEL		4
 
+enum {
+	LX_ACTIVE = 0,
+	LX_TRIGGERED,
+	LX_ACCUMULATING
+};
+
+
 class V4L2_Base
 {
   public:
@@ -100,6 +107,10 @@
   int setcroprect(int x, int y, int w, int h, char *errmsg);
   struct v4l2_rect getcroprect();
 
+  void setlxstate( short s ) { lxstate = s; }
+  short getlxstate() { return lxstate; }
+  bool isstreamactive() { return streamactive; }
+
   protected:
 
   int xioctl(int fd, int request, void *arg);
@@ -134,6 +145,9 @@
   bool cropset;
   bool cansetrate;
   bool streamedonce;
+  bool streamactive;
+  
+  short lxstate;
 
   struct v4l2_queryctrl queryctrl;
   struct v4l2_querymenu querymenu;