Распиновка, расположение выводов и внешний вид последовательного интерфейса:
RS232
Common names: EIA-232D (RS232-D), ITU-TSS (CCITT) V.24/V.28, ISO 2110
(at the DTE)
(at the DCE)
25 PIN D-SUB MALE at the DTE (Computer).
25 PIN D-SUB FEMALE at the DCE (Modem).
Pin
Name
RS232
V.24
Dir
Description
1
GND
n/a
101
Shield Ground
2
TXD
BA
103
Transmit Data
3
RXD
BB
104
Receive Data
4
RTS
CA
105
Request to Send
5
CTS
CB
106
Clear to Send
6
DSR
CC
107
Data Set Ready
7
GND
AB
102
System Ground
8
CD
CF
109
Carrier Detect
9
—
—
RESERVED
10
—
—
RESERVED
11
STF
126
Select Transmit Channel
12
S.CD
SCF
122
Secondary Carrier Detect
13
S.CTS
SCB
121
Secondary Clear to Send
14
S.TXD
SBA
118
Secondary Transmit Data
15
TCK
DB
114
Transmission Signal Element Timing
16
S.RXD
SBB
119
Secondary Receive Data
17
RCK
DD
115
Receiver Signal Element Timing
18
LL
LL
141
Local Loop Control
19
S.RTS
SCA
120
Secondary Request to Send
20
DTR
CD
108.2
Data Terminal Ready
21
RL
RL
140
Remote Loop Control
22
RI
CE
125
Ring Indicator
23
DSR
CH
111
Data Signal Rate Selector
24
XCK
DA
113
Transmit Signal Element Timing
25
TI
TM
142
Test Indicator
Note: Direction is DTE (Computer) relative DCE (Modem).
Note: RS232 column is RS232 circuit name.
Note: ITU-T column is ITU-TSS V.24 circuit name.
Note: Do not connect SHIELD(1) to GND(7).
Contributor:
Joakim Цgren,
Petr Krc
Source:
?
Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-13