Comtrol RocketPort Plus Universal PCI - Manual (Page 10)

10 - Connecting Serial Devices RocketPort Plus Universal PCI User Guide: 2000369 Rev. C
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.
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.
Pins RS-232 Signals
1 CD
2 RxD
3 TxD
4 DTR
5 Signal GND
6 DSR
7 RTS
8 CTS
9 RI
Pin 1 Pin 5
Pin 6 Pin 9
Male
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