I’m kinda/sorta in the same boat. I’ve got an original, blue D-Command and a rev.f XMon. From my D-Command manual it has the pinout as below which appears to use all 15 pins and a shield/ground between the housings on the DB15. Am I missing something on this cable? I used a 20ft serial cable male on one end, female on the other removing the female and putting a barrier strip type DB15 male in its place wiring all pins for both ends. Still rewiring my whole setup so haven’t tried this cable yet to see if it works, just looking for a heads up if I need it.