[Kenwood] inter connection of kenwood TS-850 to computer

[ve3rin]

I wonder if any one has the schematics for a serial interface between the computer and the Kenwood TS-850S. The manual calls for a IF-232. I have seen many examples of different types but non of them indicate weather they will work on my model. As I am retired and on a tight fixed income, I would hope to build one.
I am hoping to run Ham Radio Deluxe with my set up. 

I certainly hope some one out there can assist me in my endeavor.
Gary ve3rin
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