DESIGNER’S HANDBOOK 4189350049C EN
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In normal dimmer mode (without auto colour shift), the dimmer level from 0 to 100 % controls the backlight level
range from
“Min backlight level”. This must be set at the lowest backlight level where the display is still readable in
dark night conditions (typically level 10) to
“Max backlight level”, which is the level used in full daylight. Typically for
XDi 96 and 144 this parameter is set to the max. level 250.
In XDi 192 the max. level is automatically reduced to 225 when the library for this version is generated, this is to
extend the backlight life expectation.
Min and max. backlight level can be used to align backlight on several XDi indicators controlled by the same
dimmer source, for example adjust a new XDi to match another XDi with a slightly aged display.
(see dimmer setup description below).
In case of very aged displays, it may also be necessary to adjust/calibrate the display colours of a new XDi, please
see the chapter on Display colour adjust.
10.1.2
Fixed dimmer level
When the XDi is installed in a location where dimmer adjustment is not needed, for example Engine Control Room
(ECR), the fixed dimmer function should be used to set the backlight level to a fixed level.
It is often a good idea to use the local group setting for indicators using fixed dimmer level, but if a number of XDi
units in the ECR are connected via the same CAN bus, it makes sense to place them in a dimmer group and then
you only need to adjust the level on one unit to get all of them synchronised.
Reducing the backlight level will increase the lifetime of the backlight LEDs. When the XDi is
used in the engine control room or other locations where a fixed dimmer level is used, it is
recommended to reduce the dimmer setting to 75-85 %. This will more than double the
expected lifetime of the backlight.
