The Free On-line Dictionary of Computing (30 December 2018):

EIA-485
RS-485

    (Formerly "RS-485") An EIA
   serial line standard which specifies 2-wire,
   half-duplex, differential line, multi-point
   communications.  Maximum cable length is 1200m.  Maximum data
   rates are 10Mbps at 1.2m or 100Kbps at 1200m.  EIA-485 can
   implement a truly multi-point communications network, and
   specifies up to 32 drivers and 32 receivers on a single
   (2-wire) bus.

   Differential SCSI uses EIA-485.

   Details on RS-232, 422, 423, and 485
   (http://rs485.com/rs485spec.html).

   (2003-04-18)