On Thu, Jun 14, 2001 at 10:08:52PM -0700, Andy Steven Ball wrote:

>   AJG> localtalk: appletalk over multidrop RS422
> 
> Is it RS-422 or RS-485?

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

http://www.interfacebus.com/Design_Connector_RS422.html
http://www.rs485.com/rs485spec.html

-- 
  Aaron J. Grier | "Not your ordinary poofy goof." | agrier@poofygoof.com