Comtrol RocketPort Serial Hub - Manual (Page 4)

Connecting Devices 4 of 6
8. If you are operating in a multiple-server
environment, make sure that you are controlling
the RocketPort Serial Hub from its primary server,
that there is only one primary server assigned to
this RocketPort Serial Hub, and that no backup
server has pre-empted the primary server.
9. Backup-to-primary switching is not automatic.
Once a backup server takes over control of a
RocketPort Serial Hub, you must restore the
primary server to operation, then cycle the power
on the RocketPort Serial Hub in order to force the
RocketPort Serial Hub to reattach itself to the
primary server.
10. See the Software Installation documentation for
information on operating system specific
troubleshooting procedures.
11. If you have a spare RocketPort Serial Hub, try
“hot-swapping” RocketPort Serial Hub units. See
the
“Hot-Swapping” Hardware discussion.
Note: If this corrects the problem, the RocketPort
Serial Hub that you have removed from
service may be defective or in need of repair.
12. Reboot the server.
13. Remove and reinstall the driver.
14. If you are unable to resolve the problem, contact
Technical Support .
Connecting Devices
Use the following discussion to connect RS-232
asynchronous devices to the RocketPort Serial Hub
ports.
1. Connect your RS-232 devices to Ports 1 through 4 or
8 (depending on the model), for each RocketPort
Serial Hub. RJ45 to DB25 cables are available from
Comtrol or you can build your own cables using the
cabling 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 Software
Installation documentation or the driver readme
file.
Building an Ethernet Crossover Cable
If you are connecting from the
10Base-T connector on the
RocketPort Serial Hub directly
to the NIC card in the server,
you need a crossover cable. Use
the following information to
build or purchase a cable.
RS-232 Cabling
Use the following for pinout
information for the RJ45 serial
port connectors on the
RocketPort Serial Hub.
Building Additional Loopback Plugs
Loopback connectors are RJ45 female serial port plugs,
with pins wired together as shown, that are used in
conjunction with the diagnostic software to test serial
ports. The RocketPort Serial Hub is shipped with a
single loopback plug.
This information can help you build additional plugs or
replace a missing loopback.
Use the following information
to build loopback plugs.
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 6 to 7
Note: Do not insert the serial
port loopback plug into
the 10Base-T Ethernet
connector.
Pin
Connects to
Pin
1 3
2 6
3 1
6 2
Pin 1 Pin 6
Receptacle
Pin 1
RJ45
Pin
RS-232
Signals
1 RTS
2 DTR
3 GND
4 TxD
5 RxD
6 DCD
7 DSR
8 CTS
Pin 1 Pin 8
Receptacle
Pin 1
Pin
1
2
3
4
5
6
7
8
Signal
RTS
DTR
GND
TxD
RxD
DCD
DSR
CTS