diff -r cb69a65bb88d -r ea32aa303987 src/nmtMaster.c
--- a/src/nmtMaster.c	Thu Sep 24 10:16:09 2009 +0200
+++ b/src/nmtMaster.c	Wed Sep 30 12:01:25 2009 +0200
@@ -76,7 +76,7 @@
   UNS16 tmp = nodeId | (NODE_GUARD << 7); 
   m.cob_id = UNS16_LE(tmp);
   m.rtr = REQUEST;
-  m.len = 1;
+  m.len = 0;
 
   MSG_WAR(0x3503, "Send_NODE_GUARD to node : ", nodeId);