diff --git a/pylacrosse/lacrosse.py b/pylacrosse/lacrosse.py
index 5cd4316..12495c9 100644
--- a/pylacrosse/lacrosse.py
+++ b/pylacrosse/lacrosse.py
@@ -19,6 +19,7 @@
 import logging
 import re
 import threading
+import time
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -76,9 +77,12 @@ def start_scan(self):
         self._start_worker()
 
     def _write_cmd(self, cmd):
+        """ensure there is enough time between commands"""
+        time.sleep(0.5)
         """Write a cmd."""
         self._serial.write(cmd.encode())
 
+
     @staticmethod
     def _parse_info(line):
         """