25针串口到25针Modem连线

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电缆两端的到计算机的插头是 25 针母插头：

25 PIN D-SUB FEMALE
到 Modem 的一头是 25 针公插头：
25 PIN D-SUB MALE

引脚定义

　

　 Female Male Dir
Shield Ground 1 1 ---
Transmit Data 2 2 -->
Receive Data 3 3 <--
Request to Send 4 4 -->
Clear to Send 5 5 <--
Data Set Ready 6 6 <--
System Ground 7 7 ---
Carrier Detect 8 8 <--
Data Terminal Ready 20 20 -->
Ring Indicator 22 22 <--