RS422串行口针脚界说图 引脚界说
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：
|
引脚界说 |
Pin | Name | Dir | DescripTIon |
|---|---|---|---|
|
1 |
GND |
|
Shield Ground |
|
2 |
SRI |
|
Signal Rate Indicator |
|
3 |
n/c |
– |
Spare |
|
4 |
SD |
|
Send TIming |
|
6 |
RD |
|
Receive Data |
|
7 |
RTS |
|
Receiver Ready |
|
9 |
CTS |
|
Clear To Send |
|
10 |
LL |
|
Data Modem |
|
12 |
TR |
|
Receiver Ready |
|
14 |
RL |
|
Incoming Call |
|
16 |
SF/SR |
|
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 |
|
Signal Quality |
|
34 |
NS |
|
Terminal Timing TPR |
|
36 |
SB |
|
Standby Indicator |
|
37 |
SC |
|
Send Twister Pair Common |
