PC串行口引脚定义图

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

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

–