diff --git a/src/PilatusXM.py b/src/PilatusXM.py
index b4a401f0bf070ae43af7b53c438e36ada00fff50..7648c16dc2c3401249f5ac8ee2dace59d3b318d8 100755
--- a/src/PilatusXM.py
+++ b/src/PilatusXM.py
@@ -6,7 +6,7 @@
 #  license :
 # ============================================================================
 #
-#  File :        PilatusXM.pyf
+#  File :        PilatusXM.py
 #
 #  Project :     Interface class for the Pilatus detectors
 #
@@ -1009,8 +1009,8 @@ class PilatusXM (PyTango.LatestDeviceImpl):
         self.read_ExposurePeriod(expPeriodAttr)
         expTimeAttr = fakeAttr()
         self.read_ExposureTime(expTimeAttr)
-        if (expPeriodAttr.value  < (expTimeAttr.value + 0.003) ):
-            expPeriodAttr.set_value(expTimeAttr.value + 0.003)
+        if (expPeriodAttr.value  < (expTimeAttr.value + self.ReadOutTime) ):
+            expPeriodAttr.set_value(expTimeAttr.value + self.ReadOutTime)
             self.write_ExposurePeriod(expPeriodAttr)
         fullname = "%s%05d%s" % (self.attr_FilePrefix_read,self.attr_FileStartNum_read,self.attr_FilePostfix_read)
         trgModes = {0:"exposure", 1:"extenable",2:"exttrigger",3:"extmtrigger"}
@@ -1098,11 +1098,16 @@ class PilatusXMClass(PyTango.DeviceClass):
         'ServerAddress':
             [PyTango.DevString, 
             "The IP address of the PilatusXM camserver.",
+            True,
             [] ],
         'Simulation':
             [PyTango.DevBoolean, 
              '',
             [False]],
+        'ReadOutTime':
+            [PyTango.DevFloat, 
+            "Minimum ReadOUt influences the minimum difference between ExposurePeriod and ExposureTime.",
+            [0.003]],
         }
 
 
diff --git a/src/PilatusXM.xmi b/src/PilatusXM.xmi
index ddcf7766623c8aa83de86dc9b36104109bab789e..271482b186cf19d3f30fd41686cabd10dabf82ac 100644
--- a/src/PilatusXM.xmi
+++ b/src/PilatusXM.xmi
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="ASCII"?>
 <pogoDsl:PogoSystem xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:pogoDsl="http://www.esrf.fr/tango/pogo/PogoDsl">
   <classes name="PilatusXM" pogoRevision="9.6">
-    <description description="Pilatus detectors are a series pixel detecors build by DECTRIS&#xA;&lt;br />&#xA;http://www.dectris.com.&#xA;&lt;br />&#xA;All detectors of this series can talk to the outside world via a socket&#xA;connection. An ASCI protocol is used on this sockect connection to&#xA;communicate with the detector.&#xA;&lt;p>&#xA;The server process which handles the socket on the detecor PC is&#xA;called camserver. Only one client can commumicate with camserver.&#xA;If the native client tvx is connected, the device server cannot connect until&#xA;tvx gets disconnected.&#xA;&lt;/p>" title="Interface class for the Pilatus detectors" sourcePath="/home/roberto.borghes/devel/spe/ds/PilatusXM" language="Python" filestogenerate="XMI   file,Code files,Protected Regions" license="GPL" hasMandatoryProperty="true" hasConcreteProperty="true" hasAbstractCommand="false" hasAbstractAttribute="false">
+    <description description="Pilatus detectors are a series pixel detecors build by DECTRIS&#xA;&lt;br />&#xA;http://www.dectris.com.&#xA;&lt;br />&#xA;All detectors of this series can talk to the outside world via a socket&#xA;connection. An ASCI protocol is used on this sockect connection to&#xA;communicate with the detector.&#xA;&lt;p>&#xA;The server process which handles the socket on the detecor PC is&#xA;called camserver. Only one client can commumicate with camserver.&#xA;If the native client tvx is connected, the device server cannot connect until&#xA;tvx gets disconnected.&#xA;&lt;/p>" title="Interface class for the Pilatus detectors" sourcePath="/home/roberto.borghes/devel/spe/ds/PilatusXM/src" language="Python" filestogenerate="XMI   file,Code files,Protected Regions" license="GPL" hasMandatoryProperty="true" hasConcreteProperty="true" hasAbstractCommand="false" hasAbstractAttribute="false">
       <inheritances classname="Device_4Impl" sourcePath=""/>
       <identification contact="at elettra.eu - sci.comp" author="sci.comp" emailDomain="elettra.eu" classFamily="Instrumentation" siteSpecific="" platform="Unix Like" bus="Ethernet" manufacturer="Dectris" reference=""/>
     </description>
@@ -14,6 +14,11 @@
       <status abstract="false" inherited="false" concrete="true" concreteHere="true"/>
       <DefaultPropValue>False</DefaultPropValue>
     </deviceProperties>
+    <deviceProperties name="ReadOutTime" description="Minimum ReadOUt influences the minimum difference between ExposurePeriod and ExposureTime.">
+      <type xsi:type="pogoDsl:FloatType"/>
+      <status abstract="false" inherited="false" concrete="true" concreteHere="true"/>
+      <DefaultPropValue>0.003</DefaultPropValue>
+    </deviceProperties>
     <commands name="State" description="This command gets the device state (stored in its &lt;i>device_state&lt;/i> data member) and returns it to the caller." execMethod="dev_state" displayLevel="OPERATOR" polledPeriod="0">
       <argin description="none.">
         <type xsi:type="pogoDsl:VoidType"/>