I connect my device to a truck's can port (J1939) , the truck present an error .

c yl <[email protected]>
Newsgroups gmane.comp.hardware.bus.can
Message-ID <741425673.1907688.1421661374332.JavaMail.yahoo@jws100103.mail.ne1.yahoo.com> 
Hi Everyone:
    I'm connecting my can port of an arm7 board (lpc2478 with ecos which works all OK) to a truck's can port, and the truck presents an error: I think its communication error or something. And at the same time my board can receive can packages right. If I set my can port to listen only mode , the truck tells no error, and I can receive can packages but I can't send then .    Can anyone tell me why the truck tells error when my can port works at a normal mode? Should I work only in a listen only mode?
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