diff -r 784bb76105cd -r 4d5b739edcb5 master/fsm_sii.c
--- a/master/fsm_sii.c	Mon Sep 29 10:17:33 2008 +0000
+++ b/master/fsm_sii.c	Tue Sep 30 07:34:55 2008 +0000
@@ -241,6 +241,7 @@
             break;
     }
 
+    ec_datagram_zero(datagram);
     fsm->retries = EC_FSM_RETRIES;
     fsm->state = ec_fsm_sii_state_read_fetch;
 }
@@ -381,6 +382,7 @@
 
     // issue check datagram
     ec_datagram_fprd(datagram, fsm->slave->station_address, 0x502, 2);
+    ec_datagram_zero(datagram);
     fsm->retries = EC_FSM_RETRIES;
     fsm->state = ec_fsm_sii_state_write_check2;
 }