资料来源 : Free On-Line Dictionary of Computing

EIA-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://www.rs485.com/rs485spec.html)}.
     
        (2003-04-18)