diff --git a/script/local.py b/script/local.py
index a59ff90..3e2d60d 100644
--- a/script/local.py
+++ b/script/local.py
@@ -47,7 +47,7 @@ class RobotModbus(DeviceBase):
         for arg in argv:
             args[index] = arg
             index = index + 1
-        robot_args.write(args)
+        robot_args.write(to_array(args, 'i'))
         robot_req.write(1)
         try:           
             self.request()