RS232串行接口引脚定义图
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
