BSS Audio FDS 355, User Manual

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17.0 System Security
Any changes made to an audio system have the potential to be damaging,
even if only accidentally made. For this reason several different security
systems are built in to the FDS-355 to protect the speakers.
Each of the security levels locks different groups of variables away from
accidental or malicious adjustment.
System Security
17.1 Program lock
This is a flag that is available for each stored program. A program can be
locked when it is stored - the user is prompted when Store is pressed for the
second time.
Locking a program in this way is purely to protect the user against
accidentally overwriting a stored file. The lock status can be changed by
anyone unless the program is OEM locked (see next page).
17.2 Lock mode The Lock Mode in the Utility Menu can be turned on at any time.
When Lock Mode is set to ON, no variables can be changed except for the
Display Angle and Backlight and, of course, the Lock Mode. The user can
move around the screens to look at any variable but only the front panel gain
trims and mutes are available to be adjusted. When Lock Mode is ON, the
Default Screen will display the unit's logo along with the current program
number and names.
Locking the unit in this way is only to protect the user against other users
changing the system setup accidentally or against unauthorised people
intentionally changing the system. This status can be changed by anyone who
knows how to operate the FDS-355.
17.3 Owner lock
The Owner lock mode gives the user the privilege of being able to hide
selected parameters from other users view and prevent those parameters from
being tampered with. A password is entered by the engineer to protect the
integrity of the locked parameters, and this password is necessary to
subsequently gain access to the Owner locked parameters and to the
parameter locking mechanisms. The end user may then use the locked Owner
program as a basis for operating a system, and make further modifications to
the setup, to an extent completely controlled by the designer.
To set Owner Lock (Utilities menu) ACTIVE, the user will be asked to enter
the default password, which is 'OMNI' for Owner lock. The use of a default
password is to prevent accidental or malicious setting of lock flags. The user
enters the default password by turning the parameter wheel to change each
letter, and either press the UP/DOWN keys, or push the parameter wheel to
move along the password. The user should then press STORE to enter the
default password, or push the parameter wheel until the cursor reaches the end
of the password.
Once in the Owner Lock Screen the owner can move around the screens in
the usual manner, but turning the parameter wheel will now toggle Owner
Lock on/off for the current screen (shown by a padlock icon in place of the
current value). At the 'end' of the used EQs screen, there is an option to 'Lock
extra EQs'. This option gives the owner the ability to prevent any user without
the correct password from entering any further EQs onto that channel. Once