User`s guide

2-8 TL891 MiniLibrary System User's Guide
Compaq Confidential – Need to Know Required
Writer: Everett Godaire Project: TL891 MiniLibrary System User's Guide Comments:
Part Number: ER-TL891-UA.A01 File Name: c-ch2 Operation Last Saved On: 3/1/99 2:14 PM
Front Panel and Media Locks
To avoid accidental interruption of system operation by entering the Menu
Mode or removing cartridges while the host is accessing the system, the front
panel and the media for each module may be electronically locked. When the
front panel of the Expansion Unit is locked, you can only enter the Menu
Mode after entering a 4-digit code. That is, when the Default Screen is
displayed, pressing the
Enter
button does not invoke the Menu Mode until you
enter the code. The front panel of a Base Module cannot be unlocked without
using the Security submenu on the Expansion Unit to unlock it.
All Base Module front panels are locked by default when connected to a
Expansion Unit.
Media located in any or all modules may be locked and unlocked using the
Security submenu on the Expansion Unit. When the media are locked, you can
only remove media after unlocking the module from the Expansion Unit using
the Security submenu.
Procedures for locking and unlocking front panels and media are described
later in this chapter.
Starting the System
NOTE:
When turning on power to the MiniLibrary, power
must
be applied to the
Expansion Unit either simultaneously with or after the other modules. If the Expansion Unit
is powered on first, its inventory of modules may be incorrect, and the contents of some
or all of the modules will be inaccessible to the system and to the host.
Display Messages
The display on the control panel is capable of displaying four lines of 20
characters each, to allow the use of easy-to-understand messages. Many of
these messages and their functions are described in this chapter. Those
displays that are described in other chapters are cross-referenced here as well.