직렬 통신(serial communication) u 9핀 직렬 포트 DSR (Data Set Ready) RTS (Request To Send) CTS (Clear To Send) RI (Ring Indicator) 1 DCD (Data Carrier Detect) 2 RX (Received Data) 3 TX (Transmitted Data) 4 DTR (Data Terminal Ready) 5 GND (Signal Ground) 6 7 8 9
직렬 통신(serial communication) u PC-모뎀 DCD RX TX DTR GND DSR RTS CTS RI ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ PC vs. PC-PC 직렬 통신 ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ DCD RX TX DTR GND DSR RTS CTS RI 모뎀 DCD RX TX DTR GND DSR RTS CTS RI ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ DCD RX TX DTR GND DSR RTS CTS RI PC PC