RS422串行口針腳定義圖 引腳定義
計(jì)算機(jī)側(cè) RS-422 串行接口的插口是 25 針公插：
設(shè)備側(cè) RS-422 串行接口插頭是 25 針母插：
|
引腳定義 |
|
Pin |
Name |
Dir |
Description |
|---|---|---|---|
|
1 |
GND |
Shield Ground | |
|
2 |
SRI |
Signal Rate Indicator | |
|
3 |
n/c |
- |
Spare |
|
4 |
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 |
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 |