diff --git a/src_main/io_devices/piserial.cpp b/src_main/io_devices/piserial.cpp
index cab28cec..bdf47890 100755
--- a/src_main/io_devices/piserial.cpp
+++ b/src_main/io_devices/piserial.cpp
@@ -496,6 +496,19 @@ PIByteArray PISerial::readData(int size, double timeout_ms) {
 }
 
 
+bool PISerial::send(const void * data, int size) {
+	int ret = 0;
+	int wsz = 0;
+	do {
+		ret = write(&(((uchar*)data)[wsz]), size - wsz);
+		if (ret > 0) wsz += ret;
+		piCout << ret << wsz;
+		else return false;
+	} while (wsz < size);
+	return (wsz == size);
+}
+
+
 bool PISerial::openDevice() {
 	//piCout << "ser open" << path();
 	if (path().isEmpty()) return false;
diff --git a/src_main/io_devices/piserial.h b/src_main/io_devices/piserial.h
index cb1ad9f8..fe99c669 100755
--- a/src_main/io_devices/piserial.h
+++ b/src_main/io_devices/piserial.h
@@ -164,11 +164,11 @@ public:
 
 	//! \brief Write to device data "data" with maximum size "size" and wait for data written if "wait" is \b true.
 	//! \returns \b true if sended bytes count = "size"
-	bool send(const void * data, int size) {return (write(data, size) == size);}
+	bool send(const void * data, int size);
 
 	//! \brief Write to device byte array "data" and wait for data written if "wait" is \b true.
 	//! \returns \b true if sended bytes count = size of string
-	bool send(const PIByteArray & data) {return (write(data.data(), data.size_s()) == data.size_s());}
+	bool send(const PIByteArray & data) {return send(data.data(), data.size_s());}
 	
 	//! \brief Returns all available speeds for serial devices
 	static PIVector<int> availableSpeeds();