diff --git a/MTC_Sim/MTC_Sim/AdapterESA.cs b/MTC_Sim/MTC_Sim/AdapterESA.cs
index 4e48a70..7f853ed 100644
--- a/MTC_Sim/MTC_Sim/AdapterESA.cs
+++ b/MTC_Sim/MTC_Sim/AdapterESA.cs
@@ -6,13 +6,20 @@ using System.Threading.Tasks;
 using SCMCncLib;
 using XSimGph;
 using System.Windows.Forms;
+using System.Threading;
 
 namespace MTC_Adapter
 {
     public class AdapterESA : AdapterGeneric
     {
-
-        thdNcEsaGvKvara EsaController;
+        /// <summary>
+        /// oggetto onnessione ESA
+        /// </summary>
+        protected thdNcEsaGvKvara ncDevice;
+        /// <summary>
+        /// thread del processo comunicazione esa
+        /// </summary>
+        protected Thread thdDevice;
 
         /// <summary>
         /// estende l'init della classe base...
@@ -24,18 +31,21 @@ namespace MTC_Adapter
             string iniPath = string.Format(@"{0}\{1}\{2}", Application.StartupPath, utils.CRS("adapterConfPath"), utils.CRS("defaultEsaFile"));
 
             if (utils.CRB("verbose")) lg.Info("Start init Adapter ESA dal file {0}", iniPath);
-
-            // !!! 2016.05.25 verificare se serva altro x istanziare oggetto NcEsaGvKvara
+            
             IniFiles.IniFile EsaIni = new IniFiles.IniFile(iniPath);
-            EsaController = new thdNcEsaGvKvara(EsaIni);
+            ncDevice = new thdNcEsaGvKvara(EsaIni);
 
             // inizializzo posizioni assi...
             prevPosAxis = new double[adpConf.nAxis];
             prevDirAxis = new int[adpConf.nAxis];
-            
+
+            // verifica modalità avvio...
+#if false
             // disconnetto e connetto...
             if (utils.CRB("verbose")) lg.Info("ESA: tryDisconnect");
             tryDisconnect();
+
+#endif
             if (utils.CRB("verbose")) lg.Info("ESA: tryConnect");
             tryConnect();
             if (utils.CRB("verbose")) lg.Info("End init Adapter ESA");
@@ -45,11 +55,20 @@ namespace MTC_Adapter
         public override void tryDisconnect()
         {
             base.tryDisconnect();
+
+            ncDevice.RequestStop();
+            // wait for thread
+            while (!ncDevice.Finished)
+                Thread.Sleep(100);
         }
 
         public override void tryConnect()
         {
             base.tryConnect();
+            
+            // !!! 2016.05.25 verificare funzionamento thread... eventualmente portare entro metodo questo thread con suoi timing...
+            // avvio il thread...
+            thdDevice = new Thread(ncDevice.Execute);
         }
     }
 }
diff --git a/MTC_Sim/SCMCncLib/SCMCncLib.csproj b/MTC_Sim/SCMCncLib/SCMCncLib.csproj
index aeac735..78f2a72 100644
--- a/MTC_Sim/SCMCncLib/SCMCncLib.csproj
+++ b/MTC_Sim/SCMCncLib/SCMCncLib.csproj
@@ -46,6 +46,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="clsTimePeriod.cs" />
     <Compile Include="IniFile.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="thdNcBase.cs" />
diff --git a/MTC_Sim/SCMCncLib/clsTimePeriod.cs b/MTC_Sim/SCMCncLib/clsTimePeriod.cs
new file mode 100644
index 0000000..126e9c3
--- /dev/null
+++ b/MTC_Sim/SCMCncLib/clsTimePeriod.cs
@@ -0,0 +1,108 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Collections.Generic;
+
+internal sealed class TimePeriod : IDisposable
+{
+	private const string WINMM = "winmm.dll";
+
+	private static TIMECAPS timeCapabilities;
+
+	private static int inTimePeriod;
+
+	private readonly int period;
+
+	private int disposed;
+
+	[DllImport(WINMM, ExactSpelling = true)]
+	private static extern int timeGetDevCaps(ref TIMECAPS ptc, int cbtc);
+
+	[DllImport(WINMM, ExactSpelling = true)]
+	private static extern int timeBeginPeriod(int uPeriod);
+
+	[DllImport(WINMM, ExactSpelling = true)]
+	private static extern int timeEndPeriod(int uPeriod);
+
+	static TimePeriod()
+	{
+		int result = timeGetDevCaps(ref timeCapabilities, Marshal.SizeOf(typeof(TIMECAPS)));
+		if (result != 0)
+		{
+			throw new InvalidOperationException("The request to get time capabilities was not completed because an unexpected error with code " + result + " occured.");
+		}
+	}
+
+	internal TimePeriod(int period)
+	{
+		if (Interlocked.Increment(ref inTimePeriod) != 1)
+		{
+			Interlocked.Decrement(ref inTimePeriod);
+			throw new NotSupportedException("The process is already within a time period. Nested time periods are not supported.");
+		}
+
+		if (period < timeCapabilities.wPeriodMin || period > timeCapabilities.wPeriodMax)
+		{
+			throw new ArgumentOutOfRangeException("period", "The request to begin a time period was not completed because the resolution specified is out of range.");
+		}
+
+		int result = timeBeginPeriod(period);
+		if (result != 0)
+		{
+			throw new InvalidOperationException("The request to begin a time period was not completed because an unexpected error with code " + result + " occured.");
+		}
+
+		this.period = period;
+	}
+
+	internal static int MinimumPeriod
+	{
+		get
+		{
+			return timeCapabilities.wPeriodMin;
+		}
+	}
+
+	internal static int MaximumPeriod
+	{
+		get
+		{
+			return timeCapabilities.wPeriodMax;
+		}
+	}
+
+	internal int Period
+	{
+		get
+		{
+			if (this.disposed > 0)
+			{
+				throw new ObjectDisposedException("The time period instance has been disposed.");
+			}
+
+			return this.period;
+		}
+	}
+
+	public void Dispose()
+	{
+		if (Interlocked.Increment(ref this.disposed) == 1)
+		{
+			timeEndPeriod(this.period);
+			Interlocked.Decrement(ref inTimePeriod);
+		}
+		else
+		{
+			Interlocked.Decrement(ref this.disposed);
+		}
+	}
+
+	[StructLayout(LayoutKind.Sequential)]
+	private struct TIMECAPS
+	{
+		internal int wPeriodMin;
+
+		internal int wPeriodMax;
+	}
+}
+
diff --git a/MTC_Sim/SCMCncLib/thdNcEsaGvKvara.cs b/MTC_Sim/SCMCncLib/thdNcEsaGvKvara.cs
index 521da83..0ccc34e 100644
--- a/MTC_Sim/SCMCncLib/thdNcEsaGvKvara.cs
+++ b/MTC_Sim/SCMCncLib/thdNcEsaGvKvara.cs
@@ -363,11 +363,7 @@ namespace SCMCncLib
         /// <returns></returns>
         public bool CheckMultimediaTimer()
         {
-            // !!! 2016.05.25 bypass per problemi compilazione
-            int minimumPeriod = 2;
-#if false
-				int minimumPeriod = TimePeriod.MinimumPeriod;  
-#endif // false
+            int minimumPeriod = TimePeriod.MinimumPeriod;
             //int maximumPeriod = TimePeriod.MaximumPeriod;
             return ((minimumPeriod <= 2) && (minimumPeriod > 0));
         }