diff --git a/andorEmccd/andorEmccd.py b/andorEmccd/andorEmccd.py
index b4b6513..3ea3311 100755
--- a/andorEmccd/andorEmccd.py
+++ b/andorEmccd/andorEmccd.py
@@ -39,6 +39,7 @@ class LibInstance:
         20072: "DRV_ACQUIRING",
         20073: "DRV_IDLE",
         20075: "DRV_NOT_INITIALIZED",
+        20081: "DRV_DRV_I2CDEVNOTFOUND",  # can occur if USB device disappeared (e.g. camera powered off)
         20992: "DRV_NOT_AVAILABLE"
     }
 
@@ -107,7 +108,7 @@ def get_number_new_images(first, last):
         self.set_em_advanced = wrapper(dll.SetEMAdvanced, [c_int])
         self.set_em_gain_mode = wrapper(dll.SetEMGainMode, [c_int])
         self.get_detector = wrapper(dll.GetDetector, [POINTER(c_int), POINTER(c_int)])
-        self.set_kinetic_cycle_time = wrapper(dll.SetKineticCycleTime, [c_int])
+        self.set_kinetic_cycle_time = wrapper(dll.SetKineticCycleTime, [c_float])
         self.get_number_preamp_gains = wrapper(dll.GetNumberPreAmpGains, [POINTER(c_int)])
         self.get_preamp_gain = wrapper(dll.GetPreAmpGain, [c_int, POINTER(c_float)])
         self.set_preamp_gain = wrapper(dll.SetPreAmpGain, [c_int])
@@ -204,6 +205,8 @@ def __init__(self, leave_camera_warm=True, framebuffer_len=100, lib=None,
             system.
         """
         self.leave_camera_warm = leave_camera_warm
+        self._stopping = threading.Event()
+        self._thread = None
 
         if lib is None:
             self.lib = LibInstance()
@@ -254,8 +257,6 @@ def __init__(self, leave_camera_warm=True, framebuffer_len=100, lib=None,
 
         self._frame_call_list = []
 
-        self._stopping = threading.Event()
-
         # Start image acquisition thread
         self._thread = threading.Thread(target=self._acquisition_thread, daemon=True)
         self._thread.start()
@@ -271,7 +272,8 @@ def close(self):
         if self.leave_camera_warm:
             self.stop_acquisition()
             self.set_temperature(10)
-        self._thread.join()
+        if self._thread is not None:
+            self._thread.join()
         with self.lock_camera():
             self.lib.shutdown()
         self.lib = None
@@ -405,6 +407,19 @@ def set_image_region(self, hStart, hEnd, vStart, vEnd, hBin=1, vBin=1):
         binning.
         The region is 0 indexed and inclusive, so the valid ranges for hStart
         is 0..self.ccdWidth-1 etc."""
+
+        def out_of_range(val, max):
+            return val < 0 or val > max-1
+
+        if out_of_range(hStart, self.ccdWidth):
+            raise ValueError("hStart out of range")
+        if out_of_range(hEnd, self.ccdWidth):
+            raise ValueError("hEnd out of range")
+        if out_of_range(vStart, self.ccdHeight):
+            raise ValueError("vStart out of range")
+        if out_of_range(vEnd, self.ccdHeight):
+            raise ValueError("vEnd out of range")
+
         self.roiWidth = int((1+hEnd-hStart) / hBin)
         self.roiHeight = int((1+vEnd-vStart) / vBin)
 
diff --git a/setup.py b/setup.py
index d5ddfed..697b132 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,4 @@
 setup(name='andorEmccd',
     version='0.1',
     packages=['andorEmccd'],
-    entry_points={
-        "console_scripts": ["andorEmccd_controller=andorEmccd.controller:main"],
-    }
-)
\ No newline at end of file
+)