Motorola SYMBOL MINISCAN MSXX04 Guía de usuario Pagina 19

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Chapter 2: Backlight
Backlighting
7
Psion Mobile Devices Developers Guide
2.1 Backlighting
The Mobile Devices SDK provides functions that control the display and keyboard backlights. The intensity
of the backlight and the conditions under which it is activated can be queried and set using the SDK.
To conserve battery power, you can configure the backlights to switch off, or dim to half intensity, after the
computer has been inactive for a selected length of time. The following diagram shows how these times
are related:
The last device activity is one of the following:
A key is pressed on the keyboard.
The touchscreen is pressed.
The scanner trigger is pressed.
Data is received from the host.
If the computer is operating with external power, you can configure the backlights to remain on at all times.
2.1.1 Omnii and EP10
These computers have light sensors. For information see Section 22.5 Light Sensor on page 249.
2.1.2 Thresholds
On computers with ambient light sensors (7530 & 7535), there is a threshold value that specifies the light
level at which the backlights will turn on. The values for the display and keyboard backlight thresholds are
configured independently.
Threshold values are integers between 0 (zero) and 100. A value of 0 ensures that the selected backlight is
always off. A value of 100 ensures that the backlight can turn on at all lighting levels. Intermediate values
control the level of ambient light at which the backlight turns on. The lower the value, the darker it must be
before the keyboard backlight can turn on. Regardless of the threshold settings, the backlights only come
on if there is activity to trigger it, such as a keyboard, or a touch screen, event.
2.1.3 Timeouts
Using the Mobile Devices SDK, the backlight on-times and dim-times can be set to any positive integer
within the range of the parameter (typically 0 to 2147483647, measured in milliseconds). However, when
setting the values using the GUI, the choices are limited to a handful of predetermined values presented in
a drop-down list.
If a backlight timeout is set to one of the selectable values shown in the list, then the GUI applet displays
the correct value for that timeout. On the other hand if a backlight timeout is set, using the Mobile
Devices SDK, to a value that is not on the list of selectable values, then the GUI applet displays an empty
box for that timeout setting.
For all computers that have backlights, the following tables list the on-time, and dim-time, values that are
available in the GUI.
Full intensity
(on-time)
Half intensity
(dim-time)
Off
Last device activity
Time
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