舊制jis名稱新制jis名稱全 稱說 明fgsgframe ground連到機(jī)器的接地線txdsdtransmitted data數(shù)據(jù)輸出線rxdrdreceived data數(shù)據(jù)輸入線rtsrsrequest to send要求發(fā)送數(shù)據(jù)ctscsclear to send回應(yīng)對(duì)方發(fā)送的rts的發(fā)送許可,告訴對(duì)方可以發(fā)送dsrdrdata set ready告知本機(jī)在待命狀態(tài)dtrerdata terminal ready告知數(shù)據(jù)終端處于待命狀態(tài)cdcdcarrier detect載波檢出,用以確認(rèn)是否收到modem的載波sgsgsignal ground信號(hào)線的接地線(嚴(yán)格的說是信號(hào)線的零標(biāo)準(zhǔn)線)db25, db25/f, cn6db9, db9/f, cn3 最簡單連接簡單連接完全連接