Comtrol RocketPort Universal PCI - Manual (Page 12)

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