. 标准电缆
MODEM端25PIN(公) 终端端9PIN(母)
8(CD) 1(CD Carrier Detect)
3(RD) 2(RD Receive Data)
2(TD) 3(TD Transmit Data)
20(DTR) 4(DTR Data Terminate Ready)
7(GND) 5(SG Singal Ground)
6(DSR) 6(DSR Data Set Ready)
4(RTS) 7(RTS Request To Send)
5(CDS) 8(CTS Clear To Send)
22(RI) 9(RI Ring Indicate)

.三线电缆
MODEM端25PIN(公) 终端端9PIN(母)
3 2
2 3
4(RTS)，5(CTS)，8(CD)短接
6(DSR)，20(DTR)短接

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