串行直连电缆 9针-25针(NullModem)

串行直连电缆用于两台计算机的直接相连，电缆两端的插头一头是 9 针母插头，另一头是 25 针母插头：

引脚定义

　

D-Sub 9

D-Sub 25

　

Receive Data

2

2

Transmit Data

Transmit Data

3

3

Receive Data

Data Terminal Ready

4

6+8

Data Set Ready + Carrier Detect

System Ground

5

7

System Ground

Data Set Ready + Carrier Detect

6+1

20

Data Terminal Ready

Request to Send

7

5

Clear to Send

Clear to Send

8

4

Request to Send

本文关键字：电缆  各类接口资料，电子知识资料 - 各类接口资料