diff --git a/piqt_utils/piqt_connection_edit.cpp b/piqt_utils/piqt_connection_edit.cpp
index 23975bf..4977e15 100644
--- a/piqt_utils/piqt_connection_edit.cpp
+++ b/piqt_utils/piqt_connection_edit.cpp
@@ -137,11 +137,15 @@ void ConnectionEdit::setModel(const QByteArray & m) {
 		case __CV_Device:
 			b = new DeviceItem();
 			s >> ba; b->load(ba);
+			if (!b->isPropertyExists("bufferSize"))
+				((DeviceItem*)b)->setBufferSize(4096);
 			((DeviceItem*)b)->rename();
 			break;
 		case __CV_Filter:
 			b = new FilterItem();
 			s >> ba; b->load(ba);
+			if (!b->isPropertyExists("bufferSize"))
+				((FilterItem*)b)->setBufferSize(65536);
 			((FilterItem*)b)->rename();
 			break;
 		case __CV_Sender:
diff --git a/piqt_utils/piqt_connection_edit.ui b/piqt_utils/piqt_connection_edit.ui
index edcb9d0..eb99380 100644
--- a/piqt_utils/piqt_connection_edit.ui
+++ b/piqt_utils/piqt_connection_edit.ui
@@ -225,9 +225,6 @@
                      <property name="suffix">
                       <string> b</string>
                      </property>
-                     <property name="minimum">
-                      <number>4096</number>
-                     </property>
                      <property name="maximum">
                       <number>999999999</number>
                      </property>
diff --git a/piqt_utils/piqt_connection_view.cpp b/piqt_utils/piqt_connection_view.cpp
index 5862b80..3f5437c 100644
--- a/piqt_utils/piqt_connection_view.cpp
+++ b/piqt_utils/piqt_connection_view.cpp
@@ -6,9 +6,9 @@
 
 DeviceItem::DeviceItem(): BlockItem() {
 	addProperty(BlockItem::Property("__type", "", __CV_Device));
+	addProperty(BlockItem::Property("bufferSize", "", 4096));
 	setSize(200, 80);
 	setColor(QColor(192, 192, 255));
-	setBufferSize(4096);
 	text_name = new AlignedTextItem();
 	text_path = new AlignedTextItem();
 	QFont fnt(text_name->font()); fnt.setBold(true);
@@ -44,10 +44,10 @@ void DeviceItem::rename() {
 
 FilterItem::FilterItem(): BlockItem() {
 	addProperty(BlockItem::Property("__type", "", __CV_Filter));
+	addProperty(BlockItem::Property("bufferSize", "", 65536));
 	setSize(140, 80);
 	setPos(200, 0);
 	setColor(QColor(192, 255, 192));
-	setBufferSize(65536);
 	text_name = new AlignedTextItem();
 	text_mode = new AlignedTextItem();
 	QFont fnt(text_name->font()); fnt.setBold(true);
@@ -134,6 +134,7 @@ DeviceItem * ConnectionView::addDevice(const QString & name, const QString & pat
 	ret->setPath(PI2QString(dp));
 	ret->setMode(dm);
 	ret->setDisconnectTimeout(3.);
+	ret->setBufferSize(4096);
 	placeBlock(ret, allDevices());
 	addItem(ret);
 	return ret;
@@ -143,6 +144,7 @@ DeviceItem * ConnectionView::addDevice(const QString & name, const QString & pat
 FilterItem * ConnectionView::addFilter(const QString & name) {
 	FilterItem * ret = new FilterItem();
 	ret->setDisconnectTimeout(3.);
+	ret->setBufferSize(65536);
 	ret->setName(name);
 	placeBlock(ret, allFilters());
 	addItem(ret);
diff --git a/piqt_utils/piqt_connection_view.h b/piqt_utils/piqt_connection_view.h
index 4c5ead8..09a5fce 100644
--- a/piqt_utils/piqt_connection_view.h
+++ b/piqt_utils/piqt_connection_view.h
@@ -24,7 +24,7 @@ public:
 	QString path() const {return propertyByName("device").value.toString();}
 	PIIODevice::DeviceMode mode() const {return PIIODevice::DeviceMode(propertyByName("mode").value.toInt());}
 	PIIODevice::DeviceOptions options() const {return PIIODevice::DeviceOptions(propertyByName("options").value.toInt());}
-	double disconnectTimeout() const {return PIIODevice::DeviceMode(propertyByName("disconnectTimeout").value.toDouble());}
+	double disconnectTimeout() const {return propertyByName("disconnectTimeout").value.toDouble();}
 	int bufferSize() const {return propertyByName("bufferSize").value.toInt();}
 	
 	void rename();
@@ -54,7 +54,7 @@ public:
 	QString footer() const {return propertyByName("footer").value.toString();}
 	double timeout() const {return propertyByName("timeout").value.toDouble();}
 	int packetSize() const {return propertyByName("size").value.toInt();}
-	double disconnectTimeout() const {return PIIODevice::DeviceMode(propertyByName("disconnectTimeout").value.toDouble());}
+	double disconnectTimeout() const {return propertyByName("disconnectTimeout").value.toDouble();}
 	int bufferSize() const {return propertyByName("bufferSize").value.toInt();}
 
 	void rename();
@@ -75,7 +75,7 @@ public:
 	
 	QString name() const {return propertyByName("name").value.toString();}
 	QString data() const {return propertyByName("data").value.toString();}
-	double frequency() const {return PIIODevice::DeviceMode(propertyByName("frequency").value.toDouble());}
+	double frequency() const {return propertyByName("frequency").value.toDouble();}
 	
 	void rename();