PC 串行口定义


PC/AT 机上的串行口是 9 针公插座,引脚定义为:

9 PIN D-SUB MALE

Pin

Name

Dir

Description

1

CD

<--

Carrier Detect

2

RXD

<--

Receive Data

3

TXD

-->

Transmit Data

4

DTR

-->

Data Terminal Ready

5

GND

---

System Ground

6

DSR

<--

Data Set Ready

7

RTS

-->

Request to Send

8

CTS

<--

Clear to Send

9

RI

<--

Ring Indicator

PC/XT 机上的串行口是 25 针公插座,引脚定义为:

25 PIN D-SUB MALE

Pin

Name

Dir

Description

1

SHIELD

-

Shield Ground

2

TXD

-->

Transmit Data

3

RXD

<--

Receive Data

4

RTS

-->

Request to Send

5

CTS

<--

Clear to Send

6

DSR

<--

Data Set Ready

7

GND

-

System Ground

8

CD

<--

Carrier Detect

9

n/c

-

 

10

n/c

-

 

11

n/c

-

 

12

n/c

-

 

13

n/c

-

 

14

n/c

-

 

15

n/c

-

 

16

n/c

-

 

17

n/c

-

 

18

n/c

-

 

19

n/c

-

 

20

DTR

-->

Data Terminal Ready

21

n/c

-

 

22

RI

<--

Ring Indicator

23

n/c

-

 

24

n/c

-

 

25

n/c

-

 


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