diff --git a/src_main/io_devices/piserial.cpp b/src_main/io_devices/piserial.cpp
index d480e57d..b3d3c851 100755
--- a/src_main/io_devices/piserial.cpp
+++ b/src_main/io_devices/piserial.cpp
@@ -646,7 +646,8 @@ int PISerial::readDevice(void * read_to, int max_size) {
 		//piCoutObj << "read ..." << PRIVATE->hCom;
 		ReadFile(PRIVATE->hCom, read_to, max_size, &PRIVATE->readed, 0);
 		DWORD err = GetLastError();
-		if (err == ERROR_BAD_COMMAND) {
+		//piCout << err;
+		if (err == ERROR_BAD_COMMAND || err == ERROR_ACCESS_DENIED) {
 			PIThread::stop(false);
 			close();
 			return 0;
diff --git a/src_main/io_utils/piconnection.cpp b/src_main/io_utils/piconnection.cpp
index 4fbbc383..149487a5 100644
--- a/src_main/io_utils/piconnection.cpp
+++ b/src_main/io_utils/piconnection.cpp
@@ -1127,6 +1127,7 @@ void __DevicePool_threadReadDP(void * ddp) {
 //	dd->dev->threadedRead(ba.data(), ba.size());
 	if (ba.isEmpty()) {piMSleep(10); return;}
 	dev->threadedRead(ba.data(), ba.size_s());
+	dev->threadedReadEvent(ba.data(), ba.size_s());
 	//piCout << "Readed from" << dd->dev->path() << Hex << ba;
 	__device_pool__->deviceReaded(dd, ba);
 }