请教RJ-14 to RS232的线的做法

请教各位大侠，本人有一个DLINK的设备，现在要通过console连接做firmware升级，但设备上的console接口是RJ-14的（4芯），请问如何制作与电脑9针串口相连的console线？
先感谢各位大侠了！！！

着要查DLINK的说明啊，别人不知道它线的定义啊

RS232一般只用三针:2,3,5
标准的Male DB9 :
1 DCD
2RXD
3TXD
4DTR
5GND
6DSR
7RTS
8CTS

RS232串口针脚定义



RS232接口针脚定义
25针的接口定义：

Pin 1 Protective Ground
Pin 2 Transmit Data
Pin 3 Received Data
Pin 4 Request To Send
Pin 5 Clear To Send
Pin 6 Data Set Ready
Pin 7 Signal Ground
Pin 8 Received Line Signal Detector
(Data Carrier Detect)
Pin 20 Data Terminal Ready
Pin 22 Ring Indicator

9针接口针脚定义[img]http://888.aaawww.net/com/HOWJUST/comimg/52041626.jpg[/img]：
Pin 1 Received Line Signal Detector
(Data Carrier Detect)
Pin 2 Received Data
Pin 3 Transmit Data
Pin 4 Data Terminal Ready
Pin 5 Signal Ground
Pin 6 Data Set Ready
Pin 7 Request To Send
Pin 8 Clear To Send
Pin 9 Ring Indicator

[[i] 本帖最后由 jy67101 于 2006-5-19 19:13 编辑 [/i]]

厂家不同线序有别，以前底板上的串口线也有1234跟1357的区别。