Comtrol RPSH-ia - Manual (Page 7)

RocketPort® Serial Hub ia (RPSH-ia) Hardware Installation 7
DB9 Connector Pinouts
DB9 Connector Pinouts
Use the following pinout information for the DB9 serial port
connectors on the RocketPort Serial Hub ia.
Building Null-Modem Cables
Use the following figure if you need to build a null-modem cable. A null-modem
cable is required for connecting DTE devices.
Note: You may want to purchase or build a straight-through cable and purchase a
null-modem adapter.
Pin RS-232 RS-422 RS-485
1 CD Not used Not used
2 RxD RxD- Not used
3 TxD TxD- TRX-
4 DTR Not used Not used
5 GND Not used Not used
6 DSR Not used Not used
7 RTS TxD+ TRX+
8 CTS RxD+ Not used
9 RI Not used Not used
Pin 1 Pin 5
Pin 6 Pin 9
DB9 Male
RPS
H
-ia
Connect
or
TxD
RxD
RTS
CTS
DSR
GND
DCD
DTR
Signal
RxD
TxD
CTS
RTS
DTR
GND
DCD
DSR
Signal
DB9
2
3
8
7
4
5
1
6
Pins
DB25
3
2
4
7
8
6
Pins
R
e
m
o
te an
d
RP
SH
-ia
DB9
3
2
7
8
6
5
1
4
Pins
20
5
Fe
m
a
le
Connect
ors
RI 9 9 22 RI