串行直连电缆 9针-9针(NullModem)

串行直连电缆 9针-9针(NullModem)

串行直连电缆用于两台计算机的直接相连，电缆两端的插头都是 9 针母插头：

9 PIN D-SUB FEMALE

引脚定义

　

D-Sub 1

D-Sub 2

　

Receive Data

2

3

Transmit Data

Transmit Data

3

2

Receive Data

Data Terminal Ready

4

6+1

Data Set Ready + Carrier Detect

System Ground

5

5

System Ground

Data Set Ready + Carrier Detect

6+1

4

Data Terminal Ready

Request to Send

7

8

Clear to Send

Clear to Send

8

7

Request to Send

	D-Sub 1	D-Sub 2
Receive Data	2	3	Transmit Data
Transmit Data	3	2	Receive Data
Data Terminal Ready	4	6+1	Data Set Ready + Carrier Detect
System Ground	5	5	System Ground
Data Set Ready + Carrier Detect	6+1	4	Data Terminal Ready
Request to Send	7	8	Clear to Send
Clear to Send	8	7	Request to Send

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