计算机侧为25针公插:
设备侧为25针母插:
|
引脚定义 |
|
Pin |
Name |
ITU-T |
Dir |
Description |
|---|---|---|---|---|
|
1 |
GND |
101 |
Shield Ground | |
|
2 |
TXD |
103 |
Transmit Data | |
|
3 |
RXD |
104 |
Receive Data | |
|
4 |
RTS |
105 |
Request to Send | |
|
5 |
CTS |
106 |
Clear to Send | |
|
6 |
DSR |
107 |
Data Set Ready | |
|
7 |
GND |
102 |
System Ground | |
|
8 |
CD |
109 |
Carrier Detect | |
|
9 |
- |
|
- |
RESERVED |
|
10 |
- |
|
- |
RESERVED |
|
11 |
STF |
126 |
Select Transmit Channel | |
|
12 |
S.CD |
? |
Secondary Carrier Detect | |
|
13 |
S.CTS |
? |
Secondary Clear to Send | |
|
14 |
S.TXD |
? |
Secondary Transmit Data | |
|
15 |
TCK |
114 |
Transmission Signal Element Timing | |
|
16 |
S.RXD |
? |
Secondary Receive Data | |
|
17 |
RCK |
115 |
Receiver Signal Element Timing | |
|
18 |
LL |
141 |
Local Loop Control | |
|
19 |
S.RTS |
? |
Secondary Request to Send | |
|
20 |
DTR |
108 |
Data Terminal Ready | |
|
21 |
RL |
140 |
Remote Loop Control | |
|
22 |
RI |
125 |
Ring Indicator | |
|
23 |
DSR |
111 |
Data Signal Rate Selector | |
|
24 |
XCK |
113 |
Transmit Signal Element Timing | |
|
25 |
TI |
142 |
Test Indicator |