Lcd Backlight Control - ASL INTERCOM VAR8-ACU Product Description

Indicators and Controls
LCD Display
1
power
processor
LED
comms
2
fault
SELECT
BACK
Keys
DEFAULT
3
FAULT ACCEPT
FAULT CLEAR
AUDIO MON
LAMP TEST
Rotary Encoder
4
Loudspeaker
5
4.1

LCD Backlight Control

The LCD backlight is under the control of the processor. The LCD backlight is switched on when any button
is pressed, and stays on for 5 minutes after the last key press has occurred. Should a fault occur, the
backlight is automatically illuminated.
VAR8-ACU and Variants - Product Description
2 x 40 backlit alphanumeric display. Used to display the control
menu, faults, and configuration data.
green Lit only if the unit is receiving DC power from both sources.
green Flashes to show that the processor is healthy.
green Steady off. Not used.
Lit to indicate that the unit has detected a system fault.
amber
Flashes if a fault has not yet been accepted.
The left and right arrow keys move the item selection in the
direction selected, to the next item in the menu. The selected item is
indicated by [brackets] around the selection.
The up and down arrow keys toggle a selection, or increment a
number, or a letter of the alphabet when editing.
The rotary encoder acts in the same manner as these keys, and
enables faster editing.
Press after selecting an item to confirm the selection.
Press after selecting an item to cancel the selection.
If pressed repeatedly, this returns the display to the top-level menu.
Press to clear previously configured text strings quickly during
system configuration, or to return fields to their default values.
Accepts all current faults, steadies the flashing fault LED indication,
and turns off the audible alarm until a new fault condition occurs.
Clears all faults and sets all connected equipment to the 'no faults'
state. If there are any faults present in the system then they are
detected anew, and reported again.
Selects Audio Monitor sub-menu on the LCD display.
Tests all indicators on the VAR8-ACU. The sounder is also tested.
The display shows 'LAMP + SOUNDER TEST' and the menu locks
during this time.
This function is also available from the 'Tests' menu.
Multi-function:
•
An alternative for the
and decrement of menu items.
•
During Audio Monitoring it also acts as a Volume Control.
Dual function: Alarm Sounder and Audio Monitor.
Issue: 02 complete, approved
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Description
and arrow keys for fast increment