diff --git a/src/io/pibasetransfer.cpp b/src/io/pibasetransfer.cpp
index 91e3095b..1cae4672 100644
--- a/src/io/pibasetransfer.cpp
+++ b/src/io/pibasetransfer.cpp
@@ -7,7 +7,7 @@ PIBaseTransfer::PIBaseTransfer(): crc(standardCRC_16()), diag(false) {
 	header.session_id = 0;
 	packet_header_size = sizeof(PacketHeader) + customHeader().size();
 	part_header_size = sizeof(Part) + sizeof(int);
-	is_sending = is_receiving = false;
+	is_sending = is_receiving = is_pause = false;
 	break_ = true;
 	bytes_all = bytes_cur = 0;
 	replies_cnt = send_queue = 0;
@@ -36,11 +36,20 @@ void PIBaseTransfer::stopSend() {
 void PIBaseTransfer::stopReceive() {
 	if (!is_receiving) return;
 	break_ = true;
-//	piCoutObj << "stopReceive()";
+	//piCoutObj << "stopReceive()";
 	finish_receive(false);
 }
 
 
+void PIBaseTransfer::setPause(bool pause_) {
+	if (is_pause == pause_) return;
+	pause_tm.reset();
+	is_pause = pause_;
+	if (pause_) paused();
+	else resumed();
+}
+
+
 void PIBaseTransfer::received(PIByteArray data) {
 	packet_header_size = sizeof(PacketHeader) + customHeader().size();
 	if (data.size() < sizeof(PacketHeader)) {
@@ -54,94 +63,115 @@ void PIBaseTransfer::received(PIByteArray data) {
 		diag.received(data.size(), false);
 		return;
 	} else diag.received(data.size(), true);
-// 	piCoutObj << "receive" << h.session_id << h.type << h.id;
+	//piCoutObj << "receive" << h.session_id << h.type << h.id;
 	switch (pt) {
-	case pt_Unknown: break;
-	case pt_Data:
-		if (h.session_id != header.session_id || !is_receiving) {
-			sendBreak(h.session_id);
-			return;
-		} else {
-			uint rcrc = h.crc;
-			uint ccrc = crc.calculate(data.data(), data.size_s());
-			if (rcrc != ccrc) {
-				header.id = h.id;
-				sendReply(pt_ReplyInvalid);
-				piCoutObj << "invalid CRC";
+		case pt_Unknown: break;
+		case pt_Data:
+			if (h.session_id != header.session_id || !is_receiving) {
+				sendBreak(h.session_id);
+				return;
 			} else {
-				processData(h.id, data);
+				uint rcrc = h.crc;
+				uint ccrc = crc.calculate(data.data(), data.size_s());
+				if (rcrc != ccrc) {
+					header.id = h.id;
+					sendReply(pt_ReplyInvalid);
+					piCoutObj << "invalid CRC";
+				} else {
+					processData(h.id, data);
+				}
+				if (is_pause) sendReply(pt_Pause);
 			}
-		}
 		break;
-	case pt_ReplySuccess:
-	case pt_ReplyInvalid:
-		if (h.session_id != header.session_id) return;
-		if (pt == pt_ReplySuccess) {
-			send_queue--;
-			if (send_queue < 0) send_queue = 0;
-			send_tm.reset();
-		}
-		replies_cnt++;
-		if (is_sending) {
-			if (h.id >= 0 && h.id < replies.size())
-				replies[h.id] = pt;
-		}
-		if (is_receiving && h.id == 0) {
-			if (checkSession() == 0 && pt == pt_ReplySuccess) finish_receive(true);
-//			if (checkSession() == 0 && pt == pt_ReplySuccess) { piCoutObj << "Success receive"; finish_receive(true);}
-		}
+		case pt_ReplySuccess:
+		case pt_ReplyInvalid:
+			if (h.session_id != header.session_id) return;
+			if (is_pause) sendReply(pt_Pause);
+			if (pt == pt_ReplySuccess) {
+				send_queue--;
+				if (send_queue < 0) send_queue = 0;
+				send_tm.reset();
+			}
+			replies_cnt++;
+			if (is_sending) {
+				if (h.id >= 0 && h.id < replies.size())
+					replies[h.id] = pt;
+			}
+			if (is_receiving && h.id == 0) {
+				if (checkSession() == 0 && pt == pt_ReplySuccess) finish_receive(true);
+				//if (checkSession() == 0 && pt == pt_ReplySuccess) { piCoutObj << "Success receive"; finish_receive(true);}
+			}
 		break;
-	case pt_Break:
-		break_ = true;
-// 		piCoutObj << "BREAK";
-		if (is_receiving) {
-			stopReceive();
-			return;
-		}
-		if (is_sending) {
-			stopSend();
-			return;
-		}
+		case pt_Break:
+			break_ = true;
+			// piCoutObj << "BREAK";
+			if (is_receiving) {
+				stopReceive();
+				return;
+			}
+			if (is_sending) {
+				stopSend();
+				return;
+			}
 		break;
-	case pt_Start:
-		if (is_sending) {
-			sendBreak(h.session_id);
-			return;
-		}
-		if (is_receiving) {
-			if (header.session_id != h.session_id) {
-				//			sendBreak(h.session_id);
-				//			return;
-//				piCoutObj << "restart receive";
-				finish_receive(false, true);
-			} else return;
-		}
-		if (data.size() == sizeof(StartRequest)) {
-			StartRequest sr;
-			data >> sr;
-			bytes_cur = 0;
-			state_string = "start request";
-			bytes_all = sr.size;
-			header.session_id = h.session_id;
-			header.id = 0;
-			session.clear();
-			replies.clear();
-			session.resize(sr.packets);
-			replies.resize(sr.packets + 1);
-			replies.fill(pt_Unknown);
-			diag.reset();
-			diag.start(100);
-//			piCoutObj << "receiveStarted()";
-			is_receiving = true;
-			break_ = false;
-			receiveStarted();
-			replies_cnt = send_queue = 0;
-			state_string = "receiving";
-			replies[0] = pt_ReplySuccess;
-			sendReply(pt_ReplySuccess);
-		}
+		case pt_Start:
+			if (is_pause && (is_sending || is_receiving)) {
+				if (header.session_id == h.session_id) {
+					resumed();
+					is_pause = false;
+					return;
+				}
+			}
+			if (is_sending && header.session_id != h.session_id) {
+				sendBreak(h.session_id);
+				return;
+			}
+			if (is_receiving) {
+				if (header.session_id != h.session_id) {
+					//sendBreak(h.session_id);
+					//return;
+					//piCoutObj << "restart receive";
+					finish_receive(false, true);
+				} else return;
+			}
+			if (data.size() == sizeof(StartRequest)) {
+				StartRequest sr;
+				data >> sr;
+				bytes_cur = 0;
+				state_string = "start request";
+				bytes_all = sr.size;
+				header.session_id = h.session_id;
+				header.id = 0;
+				session.clear();
+				replies.clear();
+				session.resize(sr.packets);
+				replies.resize(sr.packets + 1);
+				replies.fill(pt_Unknown);
+				diag.reset();
+				diag.start(100);
+				//piCoutObj << "receiveStarted()";
+				is_receiving = true;
+				break_ = false;
+				receiveStarted();
+				replies_cnt = send_queue = 0;
+				state_string = "receiving";
+				replies[0] = pt_ReplySuccess;
+				sendReply(pt_ReplySuccess);
+			}
 		break;
-	default: break;
+		case pt_Pause:
+			if (header.session_id == h.session_id) {
+				if (!is_pause && pause_tm.elapsed_s() < timeout_) {
+					sendReply(pt_Start);
+					return;
+				}
+				if (is_pause && pause_tm.elapsed_s() > timeout_/10) sendReply(pt_Pause);
+				pause_tm.reset();
+				if (!is_pause) paused();
+				is_pause = true;
+			}
+			break;
+		default: break;
 	}
 }
 
@@ -163,9 +193,10 @@ bool PIBaseTransfer::send_process() {
 	send_tm.reset();
 	//int ltm = 0;
 	for (int i = 0; i < session.size_s(); i++) {
-		if (send_queue >= packets_count) {
+		if (send_queue >= packets_count || is_pause) {
 			--i;
 			piMSleep(1);
+			if (is_pause && pause_tm.elapsed_s() > timeout())return finish_send(false);
 			if (send_tm.elapsed_s() > timeout_) return finish_send(false);
 			if (stm.elapsed_s() > timeout_ / 10.)
 				send_queue = 0;
@@ -189,6 +220,11 @@ bool PIBaseTransfer::send_process() {
 			piMSleep(1);
 			continue;
 		}
+		if (is_pause) {
+			piMSleep(10);
+			if (pause_tm.elapsed_s() > timeout())return finish_send(false);
+			else continue;
+		}
 		prev_chk = chk;
 		if (chk > 0) {
 			if (tm2.elapsed_s() > timeout_ / 10.) {
@@ -203,7 +239,7 @@ bool PIBaseTransfer::send_process() {
 				send_queue++;
 			}
 		}
-//		if (chk == -1) return finish_send(false);
+		//		if (chk == -1) return finish_send(false);
 		if (break_) return finish_send(false);
 		piMSleep(1);
 	}
@@ -241,12 +277,12 @@ void PIBaseTransfer::buildSession(PIVector<Part> parts) {
 	for (int i = 0; i < parts.size_s(); i++) {
 		state_string = "calculating parts ... " + PIString::fromNumber(i) + " of " + PIString::fromNumber(parts.size());
 		fi.id = parts[i].id;
-// 		piCout << fi.id << state_string;
+		//piCout << fi.id << state_string;
 		bytes_all += parts[i].size;
-//		fi.size = fi.entry.size;
+		//fi.size = fi.entry.size;
 		fi.start = 0;
 		llong rest = parts[i].size - (packet_size - cur_size);
-// 		piCout << i << fi.size << rest << bytes_all;
+		//piCout << i << fi.size << rest << bytes_all;
 		if (rest <= 0) {
 			fi.size = parts[i].size;
 			lfi << fi;
@@ -255,7 +291,7 @@ void PIBaseTransfer::buildSession(PIVector<Part> parts) {
 			fi.size = parts[i].size - rest;
 			fi_index = 1;
 			fi_prts = 1 + 1 + piMaxi(1, rest / (packet_size - min_size));
-//			piCout << fi_prts;
+			//piCout << fi_prts;
 			lfi << fi;
 			session << lfi;
 			lfi.clear();
@@ -329,7 +365,7 @@ bool PIBaseTransfer::getStartRequest() {
 
 
 void PIBaseTransfer::processData(int id, PIByteArray & data) {
-// 	piCoutObj << "received packet" << id << ", size" << data.size();
+	//piCoutObj << "received packet" << id << ", size" << data.size();
 	if (id < 1 || id > replies.size_s()) return;
 	if (!session[id - 1].isEmpty()) {
 		header.id = id;
@@ -348,10 +384,11 @@ void PIBaseTransfer::processData(int id, PIByteArray & data) {
 	while (!data.isEmpty()) {
 		ba.clear();
 		data >> fi;
-		/*if (fi.size > 0) */data >> ba;
-// 		fi.fsize = ba.size();
+		//if (fi.size > 0)
+		data >> ba;
+		//fi.fsize = ba.size();
 		bytes_cur += fi.size;
-// 		piCoutObj << "recv" << fi;
+		//piCoutObj << "recv" << fi;
 		session[id - 1] << fi;
 		state_string = "receiving...";
 		receivePart(fi, ba, pheader);
@@ -368,13 +405,13 @@ PIByteArray PIBaseTransfer::build_packet(int id) {
 	PIByteArray ba;
 	header.id = id + 1;
 	header.type = pt_Data;
-// 	piCoutObj << "session id" << header.session_id;
+	//piCoutObj << "session id" << header.session_id;
 	//ret << header;
 	ret.append(customHeader());
 	for (int i = 0; i < session[id].size_s(); i++) {
 		Part fi = session[id][i];
 		ret << fi;
-// 		piCout << "biuld" << fi; 
+		//piCout << "biuld" << fi;
 		ba = buildPacket(fi);
 		bytes_cur += ba.size();
 		if (ba.size() != fi.size) piCoutObj << "***error while build packet, wrong part size";
@@ -383,7 +420,7 @@ PIByteArray PIBaseTransfer::build_packet(int id) {
 	header.crc = crc.calculate(ret);
 	PIByteArray hdr; hdr << header;
 	ret.insert(0, hdr);
-// 	piCoutObj << "Packet" << header.id << ret.size();
+	//piCoutObj << "Packet" << header.id << ret.size();
 	return ret;
 }
 
@@ -392,7 +429,7 @@ bool PIBaseTransfer::finish_send(bool ok) {
 	is_sending = false;
 	if (ok) state_string = "send done";
 	else state_string = "send failed";
-// 	piCoutObj << state_string << PIString::readableSize(bytes_all);
+	//piCoutObj << state_string << PIString::readableSize(bytes_all);
 	header.id = 0;
 	if (!ok) sendBreak(header.session_id);
 	else sendReply(pt_ReplySuccess);
@@ -407,7 +444,7 @@ void PIBaseTransfer::finish_receive(bool ok, bool quet) {
 	is_receiving = false;
 	if (ok) state_string = "receive done";
 	else state_string = "receive failed";
-//	piCoutObj << state_string;// << PIString::readableSize(bytes_all);
+	//piCoutObj << state_string;// << PIString::readableSize(bytes_all);
 	if (!ok && !quet) sendBreak(header.session_id);
 	receiveFinished(ok);
 	diag.stop();
@@ -418,7 +455,7 @@ void PIBaseTransfer::finish_receive(bool ok, bool quet) {
 void PIBaseTransfer::diagChanged(PIDiagnostics::Quality new_quality, PIDiagnostics::Quality old_quality) {
 	if (is_receiving) {
 		if (new_quality == PIDiagnostics::Failure) {
-			piCout << "disconnected!";
+			//piCout << "disconnected!";
 			stopReceive();
 		}
 	}
diff --git a/src/io/pibasetransfer.h b/src/io/pibasetransfer.h
index 8d5278fa..f1a994a1 100644
--- a/src/io/pibasetransfer.h
+++ b/src/io/pibasetransfer.h
@@ -35,6 +35,8 @@ public:
 
 	bool isSending() const {return is_sending;}
 	bool isReceiving() const {return is_receiving;}
+	bool isPause() const {return is_pause;}
+	void setPause(bool pause_);
 
 	void setPacketSize(int size) {packet_size = size;}
 	int packetSize() const {return packet_size;}
@@ -51,15 +53,19 @@ public:
 	const PIDiagnostics &diagnostic() {return diag;}
 
 	EVENT(receiveStarted)
+	EVENT(paused)
+	EVENT(resumed)
 	EVENT1(receiveFinished, bool, ok)
 	EVENT(sendStarted)
 	EVENT1(sendFinished, bool, ok)
 	EVENT1(sendRequest, PIByteArray &, data)
 	EVENT_HANDLER1(void, received, PIByteArray, data);
+	EVENT_HANDLER(void, pause) {setPause(true);}
+	EVENT_HANDLER(void, resume) {setPause(false);}
 
 protected:
 	uint packet_header_size, part_header_size;
-	bool break_, is_sending, is_receiving;
+	bool break_, is_sending, is_receiving, is_pause;
 	PIString state_string;
 	llong bytes_all, bytes_cur;
 	
@@ -71,7 +77,7 @@ protected:
 	
 private:
 
-	enum PacketType {pt_Unknown, pt_Data, pt_ReplySuccess, pt_ReplyInvalid, pt_Break, pt_Start};
+	enum PacketType {pt_Unknown, pt_Data, pt_ReplySuccess, pt_ReplyInvalid, pt_Break, pt_Start, pt_Pause};
 
 # pragma pack(push,1)
 	struct StartRequest {
@@ -88,7 +94,7 @@ private:
 	double timeout_;
 	PIVector<PIVector<Part> > session;
 	PIVector<PacketType> replies;
-	PITimeMeasurer send_tm;
+	PITimeMeasurer send_tm, pause_tm;
 	PacketHeader header;
 	CRC_16 crc;
 	int replies_cnt, send_queue;