Comtrol RocketPort Universal PCI - Manual (Page 17)

RocketPort Universal PCI User Guide: 2000284 Rev. G Connecting Serial Devices - 17
Connecting Serial Devices
RJ45 Serial Cables and Loopback Plugs (4J)
This section describe how to build your own null-modem or straight-through RJ45
serial cables.
• RJ45 Pinouts
• RJ45 Null-Modem Cables on Page 17
• RJ45 Straight-Through Cables on Page 18
• RJ45 Loopback Plugs on Page 18
There are no standards for the RJ45. Before you build the custom RJ45 serial
cable for your terminal equipment or device you should:
• Refer to the manufacturer’s installation guide if you need help with connector
pinouts or cables for the peripheral device.
• Supported RS-modes are described in the electronic document shipped with
your Comtrol device.
RJ45 Pinouts The following figures provide pinout information for the RJ45
connectors used on the Octacable interface module.
Note: Ring indicator is not supported on the RJ45 connector.
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.
You can also attach a null-modem adapter to one end of a straight-through cable to
create a null-modem cable.
The following image displays the pinouts for an RS-232 null-modem cable.
Note: RJ45 pinouts are not standardized. Each peripheral manufacturer uses
different pinouts. Refer to the document for the peripheral device to
determine the pinouts for the signals above.
Roc
k
etP
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
RJ45
4
5
1
8
7
3
6
2
Pins
20
5
DTE Device