RD242D

Can anyone suggest how to interface a Raymarine RD242D digital radome to a brand new es78 display system? I have the RD242D and was given the es78 as the person gifting it said it works with Raymarine digital radar units.

I have searched for RD242D specifics on the forum, but found nothing with that kind of specific information. Surely this configuration should not be that unusual?

Thanks for any and all help.
Doug