RS422串行口针脚定义图 引脚定义
计算机侧 RS-422 串行接口的插口是 25 针公插：
设备侧 RS-422 串行接口插头是 25 针母插：
|
引脚定义 |
|
Pin |
Name |
Dir |
Description |
|---|---|---|---|
|
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 |