Comtrol RPSH-ia - Manual (Page 8)

RocketPort® Serial Hub ia (RPSH-ia) Hardware Installation 8
Building Straight-Through Cables
Building Straight-Through Cables
Use the following figure if you need to build a straight-through cable. Straight-
through cables are used to connect DCE devices.
Building Additional Loopback Plugs
Loopback connectors are DB9 female serial port plugs, with pins wired together as
shown, that are used in conjunction with application software to test serial ports.
Note: Drivers for Windows 95/98 and Windows NT are bundled with the Test
Terminal (WCOM32) program. Linux users can use MiniCom. See the
driver documentation for your driver for information about using these
applications.
The RocketPort Serial Hub ia is shipped with a a single loopback plug (RS-232/
422).
This information can help you build additional plugs or replace a missing
loopback.
Wire the following pins together for an RS-232 loopback
plug:
• Pins 1 to 4 to 6
• Pins 2 to 3
• Pins 7 to 8 to 9
Note: The RS-232 loopback plug also works for RS-422.
Wire the following pins together for an RS-422 loopback
plug:
• Pins 2 to 3
• Pins 7 to 8
RPSH
-ia Conne
c
to
r DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD or TRX-
DTR
GND
CTS
DSR
RTS or TRX+
Signal
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD or TRX-
DTR
GND
CTS
DSR
RTS or TRX+
Signal
RPS
H
-i
a Connec
tor
Fe
m
a
le
Fe
m
a
le
RI 9 9 RI
Pin 1 Pin 5
Pin 6 Pin 9
RS-232 Only
(Back View)
Pin 1 Pin 5
Pin 6 Pin 9
RS-422 Only
(Back View)