the wires are NOT reversed. it is a through cable.
if you are using the db9 adapter with the rj12 jack, be aware that many have reversed pinouts. i killed one finding that out... sure, they were $.50 a pop, but it still was annoying.
if you have any questions, be sure to read this:
http://www.chiefdelphi.com/media/papers/2433
it's a document I recently wrote with everything you would ever want to know about making the wiring work for CAN.
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Dean's List Semi-finalist 2010
1747 Harrison Boiler Robotics 2008-2010, 2783 Engineers of Tomorrow 2011, Event Volunteer 2012-current
DISCLAIMER: Any opinions/comments posted are solely my personal opinion and does not reflect the views/opinions of FIRST, IndianaFIRST, or any other organization.