communications, standard (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.