diff --git a/tools/meas.py b/tools/meas.py
index fc5c73f..1b42397 100644
--- a/tools/meas.py
+++ b/tools/meas.py
@@ -285,9 +285,10 @@ def openSerialDevice(d):
   global ser
 
   try:
-    ser = serial.Serial(d)
+    #serial.Serial.close()
+    ser = serial.Serial("\\\\.\\"+d)
   except:
-    print "ERROR: Can't open the serial device " + device
+    print "ERROR (1): Can't open the serial device " + d
     exit(1)
 
   # Toggle DTR to reset Arduino
@@ -299,8 +300,9 @@ def openSerialDevice(d):
   ser.setDTR(True)
 
   try:
+    ser.close()
     ser = serial.Serial(
-          port=d,\
+          port="\\\\.\\"+d,\
           baudrate=115200,\
           parity=serial.PARITY_NONE,\
           stopbits=serial.STOPBITS_ONE,\
@@ -308,7 +310,7 @@ def openSerialDevice(d):
           rtscts=0,\
           timeout=0)
   except:
-    print "ERROR: Can't open the serial device " + device
+    print "ERROR (2): Can't open the serial device " + d
     exit(2)
 
 #####