RS422串行口针脚定义图 引脚定义图

引脚定义

1

GND

Shield Ground

2

SRI

Signal Rate Indicator

3

n/c

-

Spare

4

SD

Send Data

5

ST

Send Timing

6

RD

Receive Data

7

RTS

Request To Send

8

RR

Receiver Ready

9

CTS

Clear To Send

10

LL

Local Loopback

11

DM

Data Modem

12

TR

Terminal Ready

13

RR

Receiver Ready

14

RL

Remote Loopback

15

IC

Incoming Call

16

SF/SR

Select Frequency/Select Rate

17

TT

Terminal Timing

18

TM

Test Mode

19

GND

Ground

20

RC

Receive Twister-Pair Common

21

GND

Spare Twister-Pair Return

22

/SD

Send Data TPR

23

GND

Send Timing TPR

24

GND

Receive Timing TPR

25

/RS

Request To Send TPR

26

/RT

Receive Timing TPR

27

/CS

Clear To Send TPR

28

IS

Terminal In Service

29

/DM

Data Mode TPR

30

/TR

Terminal Ready TPR

31

/RR

Receiver TPR

32

SS

Select Standby

33

SQ

Signal Quality

34

NS

New Signal

35

/TT

Terminal Timing TPR

36

SB

Standby Indicator

37

SC

Send Twister Pair Common