資料來源 : pyDict

數據終端准備好,(指RS-232C的第20腳,在DTE已加電並已准備好時為HI,用來通知計算機可以發送數據)

資料來源 : Free On-Line Dictionary of Computing

Data Terminal Ready
     
         (DTR) The wire in a full {RS-232} connection
        that tells the {Data Communication Equipment} (DCE, typically
        a {modem}) that the {Data Terminal Equipment} (DTE, typically
        a computer or {terminal}) is ready to transmit and receive
        data.
     
        (2000-04-05)