Added multiple retries in threshold readout

src/PilatusXM.py

@@ -730,14 +730,19 @@ class PilatusXM (PyTango.LatestDeviceImpl):
         if not self.Simulation:
             cmd = "SetThreshold"
             reply_cmd = "threshold: "
-            reply = self.comm.send_to_detector(cmd)
-            if reply is None:
-                PyTango.Except.throw_exception("Communication error","Pilatus does not reply","read_Threshold")
-            elif reply_cmd in reply:
-                self.attr_Threshold_read = int((reply.split(reply_cmd)[-1]).split(" ")[0])
-            elif "Threshold has not been set" in reply:
-                PyTango.Except.throw_exception("Pilatus error","Threshold has not been set","read_Threshold")
-            else:
+            retries = 5
+            while (retries > 0):
+                reply = self.comm.send_to_detector(cmd)
+                if reply is None:
+                    PyTango.Except.throw_exception("Communication error","Pilatus does not reply","read_Threshold")
+                elif reply_cmd in reply:
+                    self.attr_Threshold_read = int((reply.split(reply_cmd)[-1]).split(" ")[0])
+                    break
+                elif "Threshold has not been set" in reply:
+                    PyTango.Except.throw_exception("Pilatus error","Threshold has not been set","read_Threshold")
+		retries -= 1
+		time.sleep(0.2)
+            if retries == 0:
                 PyTango.Except.throw_exception("Communication error","Pilatus wrong reply","read_Threshold")
         attr.set_value(self.attr_Threshold_read)