diff --git a/posctl.cc b/posctl.cc
index 9911605..6f9bfcc 100644
--- a/posctl.cc
+++ b/posctl.cc
@@ -650,9 +650,13 @@ void PosCtl::OutputWriteValue (int axis, double value) {
 	printf ("%s:%d %s send: '%s'\n", __FILE__, __LINE__, __FUNCTION__, outbuf);
 
 	len = write (device_fd, outbuf, strlen(outbuf));
-	if ((size_t) len != strlen(outbuf) || len < 0)
-		printf ("%s:%d could not open device:%s Error:%s\n", __FILE__, __LINE__,
+	if ((size_t) len != strlen(outbuf) || len < 0) {
+		printf ("%s:%d could not write data to device:%s Error:%s\n", __FILE__, __LINE__,
+				device.c_str(), strerror(errno));
+		errormessage_display ((char *)"window-posctl", (char *)"OutputWriteValue",
+				"%s:%d could not write data to device:%s Error:%s\n", __FILE__, __LINE__,
 				device.c_str(), strerror(errno));
+	}
 };
 
 void PosCtl::OutputWriteStop (int axis) {