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Connecting Devices
Use the following discussion to connect asynchronous
devices to the RocketPort Serial Hub Si ports.
Note: Make sure that you have configured the ports
using the driver for the correct communications
mode before connecting any devices. The default
mode is RS-232. There is a remote possibility
that connecting a peripheral configured for the
wrong mode could damage the peripheral.
1. Connect your devices to Ports 1 or 2 for each
RocketPort Serial Hub Si using the appropriate
cable or you can build your own cables using the
Building Null-Modem Cables
Through Cables
discussions.
Note: Use the hardware manufacturer's installation
documentation if you need help with connector
pinouts or cabling for the peripheral device.
2. Install or reconfigure the driver using the
Installation
documentation or the driver readme
file.
Building an Ethernet Crossover Cable
If you are connecting from the
10/100Base-T connector on the
RocketPort Serial Hub Si
directly to the NIC card in the
server, you need a crossover
cable. Use the following
information to build a cable, if
necessary.
Connects to
Pin
Pin
1
3
2
6
3
1
6
2
Connecting Devices
Caution
or
Building Straight-
Software
Receptacle
Pin 1
Pin 1
Pin 6
DB9 Connector Pinouts
Use the following pinout
information for the DB9 serial port
connectors on the RocketPort Serial
Hub Si.
Pin RS-232
RS-422
1
CD
Not used Not used
2
RxD
RxD-
3
TxD
TxD-
4
DTR
Not used Not used
5
GND
Not used Not used
6
DSR
Not used Not used
7
RTS
TxD+
8
CTS
RxD+
9
Not used Not used Not used
Building Null-Modem Cables
Use the following figure if you need to build a null-
modem cable. A null-modem cable is required for
connecting DTE devices.
Null-Modem Cables
DB9
Signal
Pins
TxD
3
RxD
2
RTS
7
CTS
8
DSR
6
DCD
1
DTR
4
GND
5
Pin 9 is not connected.
Note: You may want to purchase or build a straight-
through cable and purchase a null-modem
adapter.
Building Straight-Through Cables
Use the following figure if you need to build a straight-
through cable. Straight-through cables are used to
connect DCE devices.
Straight-through Cable
DB9
Signal
Pins
1
DCD
2
RxD
3
TxD or TRX-
4
DTR
5
GND
6
DSR
7
RTS or TRX+
8
CTS
Pin 9 is not connected.
Pin 1
Pin 6
Pin 9
RS-485
DB9 Male
Not used
TRX-
TRX+
Not used
DB9
DB25
Pins
Pins
Signal
RxD
2
3
TxD
3
2
CTS
8
5
7
4
RTS
DTR
4
20
1
8
DCD
DSR
6
6
5
7
GND
DB9
Pins
Signal
1
DCD
2
RxD
3
TxD or TRX-
4
DTR
5
GND
6
DSR
7
RTS or TRX+
8
CTS
Pin 5
4 of 6
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