Have you used this setup before on a DMC? What is the converter you’re using? DMCs can be really finicky getting tools to communicate even if everything is correct. Make sure you try the door and selector, sometimes those will talk but the CLC won’t. Are you sure the adapter you’re using is connecting to the correct pins on the DB-25? Also be careful hooking up to it, there’s 24vdc present to power the FAST tool or the Orange cord adapter. It could damage the adapter if it has a connection to that pin.