hello

I hope someone can help me out.
I got an used Yaesu FC-20 tuner but the data
cable was not includes.

Please, can somebody be so kind to give me
the correct wiring of this cable, especially
for the PINs 4 and 5 (Data In / Data Out).
Is this crossover or a 1:1 wiring ?

thanks
Bernd
dg9sci