diff --git a/script/local.py b/script/local.py
index b3d1e67..44af1ef 100644
--- a/script/local.py
+++ b/script/local.py
@@ -104,14 +104,13 @@ def wait_device(dev, value, timeout=-1):
     print "Waiting " + dev.getName() + " = " + str(value)
     dev.waitValue(value,timeout)
     print "Done waiting"
-    
-    
-def convert_file(input_file_name, output_file_name, mode):   
+        
+def convert_file(input_file_name, output_file_name, pol = None):   
     print "Converting data file: " + input_file_name + " to " + output_file_name
     sep = "\t"
     line_sep = "\n"
-
-    pol = str(pol_angle.read() if (MODE == "LINEAR") else pol_mode.readback.read())
+    if pol is None:
+        pol = str(pol_angle.read() if (MODE == "LINEAR") else pol_mode.readback.read())       
     with open(input_file_name) as inp:
         lines = inp.readlines()
         with open(output_file_name, "wb") as out: