9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 9 针母插头：

9 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 　 1 ---
Transmit Data 3 2 -->
Receive Data 2 3 <--
Request to Send 7 4 -->
Clear to Send 8 5 <--
Data Set Ready 6 6 <--
System Ground 5 7 ---
Carrier Detect 1 8 <--
Data Terminal Ready 4 20 -->
Ring Indicator 9 22 <--