Hitachi 7000-series HPLC D-Line Issue

Just acquired a Hitachi HPLC from the university trash. I have the interface, the pump, the autosampler, and the organizer. However, I am having some trouble getting it working. I was hoping to manually control it (I doubt I can find appropriate software), however after I plug everything it, it is telling me that the 'D-Line System is Not Ready.' Not sure what this means. To me it looks like the instrument modules just plug into one another with ethernet cables, but no luck.

Does anyone have experience with this instrument, or know where I can find a manual?

Also, I am assuming that the D-line cables are normal ethernet cables. Am I right?