Hello Aaron!

  ASB> Is it RS-422 or RS-485?

  AJG> both!  the two standards are orthogonal.  RS-422
     > defines a differential serial circuit, and RS-485
     > defines a multidrop bus.

I ought to take a closer look at the actual standard
documents then.  I read quite a bit of contradictory stuff
about these standards.  So LocalTalk uses RS-485 for its
multi-drop capability then?

Regards,
  - Andy.