TRAKKER T2090 Hand-Held Batch Computer User’s Manual
2-10
Docking Indicators
The unit has visual feedback on the state of being placed in the EZ Dock
Docking System. When the unit is initially placed in the docking system, it
beeps and the LED turns RED. After five seconds, the status of the charging
cycle is checked. If the system is actively charging, it blinks red off/on with a
duty cycle of four seconds (two seconds off, two seconds on) for a minimum of
15 minutes.
Once the battery is fully charged, the LED turns green and is on in a steady
state. When the unit is removed from the docking system, it beeps and turns off
the LED. The unit can be removed at any point during the charging cycle. This
indicator turns red, then green, within five seconds and remains green if no
battery is installed.
Battery Monitor
Applications can monitor the state of the battery by using the software Int 15h
discussed in Chapter 7. A low battery condition occurs when the battery
voltage is 2.2v or less. If a very low battery condition occurs (2.0 v or less), the
unit enters SUSPEND state (see Chapter 6 for handling very low battery
conditions). Also, under cold boot conditions, if a low battery is detected, the
unit will power off without booting.
Keyboard Mode Indicator
An alpha/numeric keyboard mode indicator can be called by applications or
displayed on the screen at all times. Displaying the indicator is selectable as an
option under the Setup routine (discussed later in this chapter) or is callable by
applications through the Int 10h mechanism. The indicator is a 16 x 8 pixel area
mapped out to read either “123” for numeric mode or “ABC” for alpha mode.
The default condition is numeric.
Pressing the
×
key toggles between the two modes and changes the indicator
on the screen.
Developers should note that if the keyboard mode indicator is displayed, the
small area of the screen being used by the indicator is protected and is not
available for displaying other characters. ( See Chapter 7.)
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