, ▁but ▁with ▁a ▁very ▁low ▁imped ance ▁and ▁hence ▁the ▁possibility ▁of ▁cat ast roph ic ▁curr ents ▁– ▁enough ▁to ▁m elt ▁signal ▁c ables , ▁PC B ▁traces , ▁and ▁trans ce iver ▁devices . ▁ ▁R S - 4 8 5 ▁does ▁not ▁specify ▁any ▁conne ctor ▁or ▁pin out . ▁Circ uits ▁may ▁be ▁terminated ▁on ▁sc rew ▁terminal s , ▁D - sub min i ature ▁connect ors , ▁or ▁other ▁types ▁of ▁connect ors . ▁ ▁The ▁standard ▁does ▁not ▁discuss ▁cable ▁shield ing , ▁but ▁makes ▁some ▁recommend ations ▁on ▁preferred ▁methods ▁of ▁inter connect ing ▁the ▁signal ▁reference ▁common ▁and ▁equipment ▁case ▁grounds . ▁ ▁W ave form ▁example ▁ ▁The ▁diagram ▁below ▁shows ▁potential s ▁of ▁the ▁A ▁( blue ) ▁and ▁B ▁( red ) ▁p ins ▁of ▁an ▁R S - 4 8 5 ▁line ▁during ▁transmission ▁of ▁one ▁byte ▁( 0 x D 3 , ▁least ▁significant ▁bit ▁first ) ▁of ▁data ▁using ▁an ▁asynchronous ▁start - stop ▁method . ▁ ▁See ▁also ▁▁ ▁List ▁of ▁network ▁bus es ▁ ▁R S - 4 2 2 ▁ ▁R S - 4 2 3 ▁ ▁U ART ▁ ▁Notes ▁ ▁References ▁ ▁External ▁links ▁▁▁ ▁– ▁Pract ical ▁information ▁about ▁implementing ▁R S 4 8 5 ▁ ▁– ▁Im plementation ▁of ▁R S 4 8 5 ▁standard ▁in ▁the ▁Linux ▁OS ▁ ▁Category : Serial ▁bus es ▁Category : T ele communic ations - related ▁introdu ctions ▁in ▁ 1 9