im UserGuide stehts:
To initially configure the unit through a serial connection:
1. Connect a console terminal or PC running a terminal emulation program
to your
unit's serial port. The default serial port settings are 9600 baud, 8
bits, no parity,
1-stop bit, no-flow control.
2. To enter Setup Mode, reset the unit, either by pushing the red reset
button, or
cycling the unit's power (power off and back on). The self-test will
begin. You
have one second to enter three lowercase x characters (xxx).
Note: The easiest way to enter Setup Mode is to hold down the x key at
the terminal (or emulation) while resetting the unit.
3. At this point, the screen display is the same as when you use a
Telnet
connection. To continue, go to step 4 in Using a Telnet Connection on
page 21.