西门子面板C7-634 DP (OP17) 用ProTool下载数据时，需要串口连接电缆，但是该面板是15针母头D型接口，而电脑上串口是9针公头D型接口。那么15针和9针两者针脚是如何对应连线的呢？LT 对此作了笔记。
在网上搜索资料如下：http://www.plctalk.net/qanda/showthread.php?t=9115
I have cable of Siemens 6XV1440-2KH32 at my eyes. There are two side: 1-(for serial 9 pin) and another 2-(15 pin for OP).
9pin—————————————-15pin
1+4+6(are connected)
7+8(are connected)
2——————————————-4
3——————————————-3
5——————————————-12
在西门子网站上找到此电缆 6XV1440-2K___ 官方接线图 （链接link）
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http://www.plctalk.net/qanda/showthread.php?t=24058 - What connecting cables are there for connections between the operator panels and the different controllers?
http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=29034071&caller=view - 面板上传下载问题集（ProTool）（更新版）文档编号 A0110 日期2008/01/15
http://www2.ad.siemens.com.cn/Download/Upload/AS/application/A0110.pdf - OP7, OP17 Operator Panel Equipment Manual http://support.automation.siemens.com/WW/view/en/1145112
- RS232 Pinout
http://rs232pinout.org/serial-port-pinout/