12 - Connecting Serial Devices
RocketPort Universal PCI User Guide
: 2000284 Rev. G
Connecting Serial Devices
DB9 Signals
This subsection provides DB9 signal information. Refer to the manufacturer’s
installation documentation if you need help with the connector pinouts or cabling
for the serial device.
DB9 Null-Modem
Cables
You need a null-modem cable to connect to DTE devices. For example, you can
connect one end of a a null-modem cable to COM2 on one computer and the other
end of the null-modem cable to COM2 on another computer.
RS-232 Null-Modem
Cable
The following image displays the pinouts for an RS-232 null-modem cable.
Note:
You can also attach a null-modem adapter to one end of a straight-through
cable to create a null-modem cable.
Pins
RS-232
Signals
RS-422 Signals*
1
CD
Not Used
2
RxD
TxD-
3
TxD
RxD+
4
DTR
Not Used
5
Signal GND
Not Used
6
DSR
Not Used
7
RTS
TxD+
8
CTS
RxD-
9
RI**
Not Used
*
RS-422 is only available if you are using an RS-422
interface box or RS-232/422 switchable interface
box.
**
RI is only supported on Quad/Octacable cards.
Pin 1
Pin 5
Pin 6
Pin 9
DB9 Male (Quad/Octacable)
Pin 1
Pin 5
Pin 6
Pin 9
DB9 Female (Interface Boxes)
RocketP
o
rt
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
20
5
DB9
3
2
7
8
6
5
1
4
Pins
Customer
DTE
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