at rol ▁and ▁He iden h ain ' s ▁L SV 2 ▁protocol . ▁Many ▁D NC ▁systems ▁offer ▁support ▁for ▁these ▁protocol s . ▁Another ▁protocol ▁is ▁D NC 2 ▁which ▁is ▁found ▁on ▁F an uc ▁controls . ▁D NC 2 ▁allows ▁advanced ▁inter change ▁of ▁data ▁with ▁the ▁control , ▁such ▁as ▁tool ing ▁off sets , ▁tool ▁life ▁information ▁and ▁machine ▁status ▁as ▁well ▁as ▁autom ated ▁transfer ▁without ▁operator ▁inter vention . ▁ ▁Machine ▁monitoring ▁ ▁One ▁of ▁the ▁issues ▁involved ▁in ▁machine ▁monitoring ▁is ▁whether ▁or ▁not ▁it ▁can ▁be ▁accomplished ▁automatically ▁in ▁a ▁practical ▁way . ▁In ▁the ▁ 1 9 8 0 s ▁monitoring ▁was ▁typically ▁done ▁by ▁having ▁a ▁menu ▁on ▁the ▁D NC ▁terminal ▁where ▁the ▁operator ▁had ▁to ▁manually ▁indicate ▁what ▁was ▁being ▁done ▁by ▁selecting ▁from ▁a ▁menu , ▁which ▁has ▁ ▁obvious ▁draw back s . ▁There ▁have ▁been ▁adv ances ▁in ▁pass ive ▁monitoring ▁systems ▁where ▁the ▁machine ▁condition ▁can ▁be ▁determined ▁by ▁hardware ▁attached ▁in ▁such ▁a ▁way ▁as ▁not ▁to ▁inter f ere ▁with ▁machine ▁operations ▁( and ▁potentially ▁void ▁war rant ies ). ▁Many ▁modern ▁controls ▁allow ▁external ▁applications ▁to ▁query ▁their ▁status ▁using ▁a ▁special ▁protocol . ▁M T Connect ▁is ▁one ▁prominent ▁attempt ▁to ▁augment ▁the ▁existing ▁world ▁of ▁propriet ary ▁systems ▁with ▁some ▁open - source , ▁industry - standard ▁protocol s ▁and ▁XML ▁sch emas ▁and ▁an ▁e cos ystem ▁of ▁mass ively ▁multi player ▁app ▁development ▁and ▁m ash ups ▁(