略語大辞典 [C] 28 ER equipment ready (signal) (データ通信での)データ端末レディ(信号). モデム制御信号名.equipment ready (signal); or DTR(data terminal ready); a modem control signalin a data communication protocol; #20 pin of DB25S connector of a computer; ref. FG(frame ground), SD(send data) orTxD(transmit data), RD(rece 丸善「略語大辞典」JLogosID : 11873908