Sorry, I don't know. I don't have the Lucas 5AS or a pscan although I have often thought of buying one. I simply knew that it could return the EKA as that is how mine was retrieved for me. I have the Pektron system. Someone with more experience with pscan/5AS should be able to provide definitive information.
Failing that, Paul Brown at Technozen Electronics is the guru on all things SCU.