Using the Service Port
893-743-A
4-3
Using the Service Port
You can connect a terminal to the service port either before you turn on the
power to the hub or while the hub is operating. Attaching a terminal allows you
to view system startup diagnostics or to configure the hub.
When the Model 281xSA hub receives power, it runs self-test diagnostics and
reports the results to the service port. If you have a standard RS-232 character
terminal connected to the port (as explained in the following section), you can
observe the diagnostic messages as the hub boots or goes through a reset.
Terminal Connection Requirements
To connect a terminal to the service port, you need the following two items:
■
An ASCII character terminal that has an RS-232 serial port or a computer
that has an RS-232 serial port and terminal emulation, typically a PC
running common communications software
■
A standard RS-232 serial communications cable with a DB-9 socket at
one end for connection to the service port and an appropriate connector,
usually a DB-9 or DB-25 plug, at the other end for connection to the serial
port on the terminal or terminal emulator
Check the service port pin assignment in Appendix C, “Pin Assignments,” to
ensure correct connections between the service port and the terminal.
Connecting to the Model 281xSA Service Port
To connect the terminal or terminal-emulating computer to the Model 281xSA
service port, follow these steps:
1.
Connect the RS-232 cable DB-9 receptacle to the service port plug.
2.
Connect the other end of the RS-232 cable to the terminal or
terminal-emulating computer RS-232 serial port.
3.
Turn on the power to the terminal or make sure the computer is
running in terminal emulation mode.
4.
Put the terminal (or emulator) into configuration mode and set the
terminal parameters to the following settings:
9600 baud
8 data bits
No parity
