Building Cables for RocketPort Products [Documentation number: 2000430 Rev B] 17
RJ45 Null-Modem Cables
RJ45 Null-Modem
Cables
You need a null-modem cable to connect to DTE devices. For example, you can
connect one end of 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 RocketPort models support RJ45 null-modem cables on RS-232
ports:
• RocketPort PCI
• RocketPort Universal PCI
• RocketPort Plus Universal PCI
The following image displays the pinouts for an RS-232 null-modem cable.
Important: RJ45 pinouts are not standardized. Each peripheral manufacturer
uses different pinouts. Please refer to the document for the
peripheral device to determine the pinouts for the signals above.
Note: You can also attach a null-modem adapter to one end of a straight-through
cable to create a null-modem cable.
RJ45 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 the straight-through cable to a modem.
RS-232 Straight-
Through Cable
The following RocketPort models support RJ45 straight-through cables on RS-232
ports:
• RocketPort PCI
• RocketPort Universal PCI
• RocketPort Plus Universal PCI
The following image displays the pinouts for an RS-232 straight-through cable.
Note: If your RJ45 wiring differs from the one shown above, adjust the RJ45
pinouts accordingly.
RocketPort
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
RJ45
4
5
1
8
7
3
6
2
Pins
20
5
Customer DTE
RocketPort
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD
DTR
GND
CTS
DSR
RTS
Signal
DCD
RxD
TxD
DTR
GND
CTS
DSR
RTS
Signal
RI
9
RJ45
6
5
4
2
3
8
7
1
Pins
N/A
DB25
8
3
2
20
7
5
6
4
Pins
Customer DCE
22
RI
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