Dell PowerVault TL4000 - Manual (Page 35)

Chapter 2. User Interfaces
This library has two user interfaces.
v Operator Control Panel - located on the front panel of the library
v “Web User Interface” on page 2-4 - accessed via a web browser
Operator Control Panel
The Operator Control Panel operates in two basic modes.
v User Interaction mode - This mode is employed when a user is pushing buttons
on the Operator Control Panel.
v System Driven mode - This is the normal mode of operation. In this mode, the
Operator Control Panel displays status associated with the actions that were
caused from commands issued via the drive's internal (drive to library) serial
interface.
When an Operator Control Panel button is pressed and released, the Operator
Control Panel automatically transitions to User Interaction mode. User Interaction
mode will continue until 3 minutes after a user stops pushing buttons, or the
requested accessor action stops - whichever is longer. At which time, the Operator
Control Panel will return to System Driven mode.
If necessary, the Operator Control Panel automatically transitions to the System
Driven mode. When this occurs, the library must remember the previous function
before the display mode changed. Therefore the next button pressed only
transitions the Operator Control Panel to the User Interaction mode from the
System Driven mode.
In case of the activated user security feature, the User Interaction mode is
restricted to Login and Monitor menu items, until a user logs in with a correct
password.
Operator Control Panel Philosophy
Operator Control Panel operation must obey some basic rules. These rules of
operation constitute a philosophy.
v Any operational conflict between commands received over the host interface or
the Web User Interface and those entered via the Operator Control Panel will be
avoided with a reservation mechanism on a first-come, first-served basis. Any
reservation by the Operator Control Panel is canceled by an Operator Control
Panel logout or a timeout, which cancels the User Interaction Mode.
v Library firmware will not allow a user to select an impossible request. Those
situations will include, but are not limited to:
– Moving a cartridge from any source to a full slot
– Moving a cartridge from an empty slot
– Loading a cartridge from any source to a full drive
– Unloading a cartridge from an empty drive
v Any error detected by the library or drive controller and not recoverable through
predetermined firmware algorithms will be considered as fatal. An error code
will be displayed on the Operator Control Panel display and the error LED will
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