diff --git a/ConcordAlarm.indigoPlugin/Contents/Server Plugin/concord/concord.py b/ConcordAlarm.indigoPlugin/Contents/Server Plugin/concord/concord.py
index 3d8ff56..17623cc 100644
--- a/ConcordAlarm.indigoPlugin/Contents/Server Plugin/concord/concord.py	
+++ b/ConcordAlarm.indigoPlugin/Contents/Server Plugin/concord/concord.py	
@@ -218,7 +218,7 @@ def update_message_checksum(bin_msg):
 def encode_message_to_ascii(bin_msg):
     s = ''
     for b in bin_msg:
-        s += '%02x' % b
+        s += '%02X' % b
     return s
 
 def decode_message_from_ascii(ascii_msg):