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fpga - C-RIO CAN erroneous ID messages

Hi all, I'm using the ni 9853 c-module for acquiring messages from an industrial motor with j1939 protocol. If acquire on the can port with a pcmcia can board everithings goes fine. If acquire from the crio module all the messages have an ID with an offset of 2^29. It seems impossible (the sja1000 controller manage id from 0-2^29) but it appens. I did not use any processing sw, I only acquire the can frame both as cluster or ar 6xU32 variable and the problem remains. It seems that an offseto of 2?29 is added to the right message ID after it is acquired. But if I try to hw-filter (with mask) anyone message I do not receive anything so this "offset" seems to be in the between the hw controller and the hw processor. What can I do for avoiding this? bye Vittorio
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