Comtrol RocketPort Universal PCI - Manual (Page 13)

RocketPort Universal PCI User Guide: 2000284 Rev. G Connecting Serial Devices - 13
Connecting Serial Devices
RS-422 Null-Modem
Cable The following image displays the pinouts for an RS-422 null-modem cable.
Note: RS-422 pinouts are not standardized. Each serial device manufacturer uses
different pinouts. Refer to the serial device User Manual to determine the
signals.
DB9 Straight-
Through Cables Straight-through cables connect modems to other DCE devices. For example, you
can connect one end of a straight-through cable to COM2 on one computer and the
other end of a straight-through cable to a modem.
The following image displays the pinouts for an RS-232 straight-through cable.
Note: Ring Indicator (RI) is only supported on Quad/Octacable cards.
DB9 Loopback Plugs RocketPort Universal PCI are shipped with a a single loopback plug. You can use
loopback plugs with application software (for example, Test Terminal) to test
serial ports.
Wire the following pins together to build additional plugs or replace a missing
loopback plug.
RS-232 Female
Loopback Plug The Quadcable and Octacable use the RS-232 female
loopback plug. To build a loopback plug for the Quadcable
and Octacable, wire the following pins together:
• Pins 1 to 4 to 6
• Pins 2 to 3
• Pins 7 to 8 to 9
Note: Ring Indicator (RI) is only supported on Quad/Octacable cards.
RS-422 Loopback
Plug To build a DB9 loopback plug for RS-422, wire the following pins together:
• Pin 2 to 8
• Pin 3 to 7
Roc
k
etP
o
rt
TxD+
TxD-
RxD+
Signal
DB9
7
2
3
Pins
RxD+
RxD-
Signal
TxD+
TxD-
RxD- 8
Customer DTE
Ro
cketP
o
r
t
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD
DTR
GND
CTS
DSR
RTS
Signal
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD
DTR
GND
CTS
DSR
RTS
Signal
RI 9 9 RI
DB25
8
3
2
20
7
5
6
4
Pins
22
Customer DCE
Pin 1 Pin 5
Pin 6 Pin 9
RS-232 (Back View)