Developers guide

Chapter 5: Backlight
Timeouts
30 Psion Teklogix Mobile Devices SDK Developers Guide
For all Psion Teklogix computers that have backlights, on-time and dim-time values are available
as follows in the Control Panel:
If a backlight timeout is set to one of the selectable values shown in the list, then the Control Panel
applet will display 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
Control Panel applet will display an empty box for that timeout setting.
On Psion Teklogix computers running Windows CE, the Display and Keyboard Backlight On-
time values determine how long the display and keyboard backlights will remain on, respectively.
Any user interaction (key press, touch screen press, scan, etc.) will reset both timeout counters
back to the beginning. If there has been no user interaction by the end of the keyboard on-time du-
ration, the keyboard backlight will turn off. At the end of the display on-time duration, the display
backlight will dim to half intensity. If there is still no user interaction by the end of the display
dim-time duration, then the display backlight will turn off completely.
Windows CE Windows Mobile
Time
(milliseconds)
Display
Backlight
On-time
Display
Backlight
Dim-time
Keyboard
Backlight
On-time
Battery
Power
Backlight
On-time
External
Power
Backlight
On-time
0 No Yes No No No
5000 Yes Yes Yes No No
10000 Yes Yes Yes Yes No
15000 Yes Yes Yes No No
30000 Yes Yes Yes Yes No
60000 Yes Yes Yes Yes Yes
120000 Yes Yes Yes Yes Yes
180000 No No No Yes Yes
240000 No No No Yes Yes
300000 Yes Yes Yes Yes Yes
360000 No No No No Yes
420000 No No No No Yes
480000 No No No No Yes
540000 No No No No Yes
600000 No No No No Yes
2147483647
(Always On,
maximum value)
Yes No Yes No
1
No
1
1
The setting for “Always On” in Windows Mobile is controlled by a checkbox that enables/disables the On-
time parameter. If the checkbox is disabled, the On-time value is ignored and the backlight will remain on.