PC/AT 機上的串行口一般是是用的9 針公插座，管腳定義為：
電腦串行口管腳定義
|
Pin |
Name |
Dir |
Description |
|---|---|---|---|
|
1 |
CD |
|
Carrier Detect |
|
2 |
RXD |
|
Receive Data |
|
3 |
TXD |
|
Transmit Data |
|
4 |
DTR |
|
Data Terminal Ready |
|
5 |
GND |
|
System Ground |
|
6 |
DSR |
|
Data Set Ready |
|
7 |
RTS |
|
Request to Send |
|
8 |
CTS |
|
Clear to Send |
|
9 |
RI |
|
Ring Indicator |
PC/XT 機上的串行口是 25 針公插座，引腳定義為：
|
Pin |
Name |
Dir |
Description |
|---|---|---|---|
|
1 |
SHIELD |
- |
Shield Ground |
|
2 |
TXD |
|
Transmit Data |
|
3 |
RXD |
|
Receive Data |
|
4 |
RTS |
|
Request to Send |
|
5 |
CTS |
|
Clear to Send |
|
6 |
DSR |
|
Data Set Ready |
|
7 |
GND |
- |
System Ground |
|
8 |
CD |
|
Carrier Detect |
|
9 |
n/c |
- |
|
|
10 |
n/c |
- |
|
|
11 |
n/c |
- |
|
|
12 |
n/c |
- |
|
|
13 |
n/c |
- |
|
|
14 |
n/c |
- |
|
|
15 |
n/c |
- |
|
|
16 |
n/c |
- |
|
|
17 |
n/c |
- |
|
|
18 |
n/c |
- |
|
|
19 |
n/c |
- |
|
|
20 |
DTR |
|
Data Terminal Ready |
|
21 |
n/c |
- |
|
|
22 |
RI |
|
Ring Indicator |
|
23 |
n/c |
- |
|
|
24 |
n/c |
- |
|
|
25 |
n/c |
- |
|