diff --git a/Tests/Modbus.Net.PersistedTests/Program.cs b/Tests/Modbus.Net.PersistedTests/Program.cs
index 81171a4..ec6ee60 100644
--- a/Tests/Modbus.Net.PersistedTests/Program.cs
+++ b/Tests/Modbus.Net.PersistedTests/Program.cs
@@ -12,7 +12,7 @@ namespace Modbus.Net.PersistedTests
         {
             Log.Logger = new LoggerConfiguration().MinimumLevel.Verbose().WriteTo.Console().CreateLogger();
 
-            IMachineProperty<int> machine = new ModbusMachine<int, string>(1, ModbusType.Ascii, "COM5",
+            IMachineProperty<int> machine = new ModbusMachine<int, string>(1, ModbusType.Rtu, "COM1",
                 new List<AddressUnit>()
                 {
                     new AddressUnit()
@@ -40,9 +40,65 @@ namespace Modbus.Net.PersistedTests
                         DataType = typeof(ushort)
                     },
                 }, true, 2, 1);
-            
+            IMachineProperty<int> machine2 = new ModbusMachine<int, string>(2, ModbusType.Rtu, "COM1",
+                new List<AddressUnit>()
+                {
+                    new AddressUnit()
+                    {
+                        Id = "1",
+                        Area = "4X",
+                        Address = 11,
+                        Name = "test 1",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "2",
+                        Area = "4X",
+                        Address = 12,
+                        Name = "test 2",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "3",
+                        Area = "4X",
+                        Address = 13,
+                        Name = "test 3",
+                        DataType = typeof(ushort)
+                    },
+                }, true, 3, 1);
+            IMachineProperty<int> machine3 = new ModbusMachine<int, string>(3, ModbusType.Rtu, "COM1",
+                new List<AddressUnit>()
+                {
+                    new AddressUnit()
+                    {
+                        Id = "1",
+                        Area = "4X",
+                        Address = 21,
+                        Name = "test 1",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "2",
+                        Area = "4X",
+                        Address = 22,
+                        Name = "test 2",
+                        DataType = typeof(ushort)
+                    },
+                    new AddressUnit()
+                    {
+                        Id = "3",
+                        Area = "4X",
+                        Address = 23,
+                        Name = "test 3",
+                        DataType = typeof(ushort)
+                    },
+                }, true, 4, 1);
+
             TaskManager<int> manager = new TaskManager<int>(20, true);
-            manager.AddMachines<string>(new List<IMachineProperty<int>>{machine});
+            manager.AddMachines<string>(new List<IMachineProperty<int>> { machine, machine2, machine3 });
             Random r = new Random();
             manager.InvokeTimerForMachine(1, new TaskItemSetData(() => new Dictionary<string, double>
             {
@@ -79,7 +135,7 @@ namespace Modbus.Net.PersistedTests
                 {
                     "4X 23.0", r.Next() % 65536
                 },
-            }, MachineSetDataType.Address, 10000, 10000));           
+            }, MachineSetDataType.Address, 10000, 10000));
             Thread.Sleep(5000);
             manager.InvokeTimerAll(new TaskItemGetData(data =>
             {
@@ -87,7 +143,7 @@ namespace Modbus.Net.PersistedTests
                 {
                     Console.WriteLine(dataInner.Key + " " + dataInner.Value.PlcValue);
                 }
-               
+
             }, MachineGetDataType.Address, 10000, 10000));
 
             Console.Read();