diff --git a/data/conf/s021.txt b/data/conf/s021.txt
index fb3f6455..9ae72453 100644
--- a/data/conf/s021.txt
+++ b/data/conf/s021.txt
@@ -1,6 +1,6 @@
 button2 = 1
-serialWrite ard-on
+serialWrite ard-11-1
 end
 button2 = 0
-serialWrite ard-off
+serialWrite ard-11-0
 end
\ No newline at end of file