Appendix b: connector pinouts, Rs-232, Inouts – B&B Electronics 3PCIOU4 - Manual User Manual
Page 51: Rs-232 pinouts
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Connector Pinouts
Document Number 3PCI-0712m
Appendix B
B -1
A
A
p
p
p
p
e
e
n
n
d
d
i
i
x
x
B
B
:
:
C
C
O
O
N
N
N
N
E
E
C
C
T
T
O
O
R
R
P
P
I
I
N
N
O
O
U
U
T
T
S
S
RS-232 Pinouts
Name
Description
Direction
(DTE)
DB-9M
Pin
DCD
Data Carrier Detect
Input
1
RD
Receive Data
Input
2
TD
Transmit Data
Output
3
DTR
Data Terminal Ready
Output
4
GND
Signal Ground
------
5
DSR
Data Set Ready
Input
6
RTS
Request to Send
Output
7
CTS
Clear to Send
Input
8
RI
Ring Indicator
Input
9
Figure 27. RS-232 Signal Designations and DB-9 Pinout
Signal Name
DB-9 Pin
(DTE)
DB-25 Pin
(DTE)
DCD
1
8
RD
2
3
TD
3
2
DTR
4
20
GND
5
7
DSR
6
6
RTS
7
4
CTS
8
5
RI
9
22
Chassis GND
Shield (DB-9
Shell)
1
Figure 28. RS-232 DB-9 to DB-25 Conversion Cable Pinout
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