Oops.
I've looked at their page several times, and misread that line every
time. It obviously DOESN'T say "2-serial, 1 DB25 connector".
Obviously, I have no idea what they (or I) are talking about.
That's the second time in two days that my ASSumption overrode what
was in front of my face, resulting in Hoof-In-Mouth disease.
Sorry.
Doc