--- a/modbus/modbus.py	Thu Oct 04 11:25:42 2018 +0300
+++ b/modbus/modbus.py	Thu Oct 04 12:07:16 2018 +0300
@@ -25,8 +25,9 @@
 
 from __future__ import absolute_import
 import os
+from six.moves import xrange
+
 from modbus.mb_utils import *
-
 from ConfigTreeNode import ConfigTreeNode
 from PLCControler import LOCATION_CONFNODE, LOCATION_VAR_MEMORY