There is an external box that you must purchase in order to connect the
computer to the 850S. I forget the exact part number, but think that it
ends in a "C." The RS232 cable connects to this little box and it in turn
to the 850S. I've had mine for a couple of years and the interface between
the rig and the software has been seamless.
FAQ on WWW: http://www.contesting.com/trlogfaq.html
Administrative requests: trlog-REQUEST@contesting.com
Feature Wishlist: http://web.jzap.com/n6tr/trwish.html