Hi Ernie, The KO4BB repository has a manual for "Option 2" of the 5680A. This might not be exactly the same as the one you have, but should hopefully at least use the same pinout. Regards, Peter On Fri Dec 19 15:06 , ernieperes at aol.com sent: >Hi Gents, > >Having a Fe5680 Rub freq standard but can not figure out the 9 pin connector...