Suspend/Resume With Gps; Suspend Via Keyboard Combination; Suspend Via Activity Timeout; Time To First Fix (Ttff) - Honeywell 7900L0P-422C20E - Hand Held Products Dolphin 7900 User Manual

Suspend/Resume with GPS

When the terminal goes into suspend mode, power is removed from the GPS module. There are two ways to control the Suspend/
Resume activity of the terminal: via the keyboard or via activity timeout.

Suspend Via Keyboard Combination

Press Blue + Backlight

Suspend Via Activity timeout

Dolphin terminals suspend when the device is inactive for a programmed period of time. The period of time is set in the Power
System Setting; see Power
To determine the frequency to use to call SystemIdleTimerReset(), retrieve the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power
! This function must be used appropriately! Keep in mind that a program that never suspends (or sleeps) by continually
calling SystemIdleTimerReset() quickly drains the battery.
Note: For complete instructions about Suspend/Resume in general, see

Time to First Fix (TTFF)

The duration of time spent in suspend mode affects the time it takes to acquire a positional fix when the terminal resumes normal
operations. This is known as "Time To First Fix" (TTFF).
Note: When the terminal boots up for the first time from the factory, TTFF can take up to 15 minutes.

Typical TTFF From No Satellite Data

The terminal stops acquiring GPS data when
1. The terminal goes into suspend mode, which can happen manually or due to device inactivity.
GPS data acquisition begins again when the terminal resumes normal operation. You have to wake the terminal manually
by pressing the Scan key. For more information, see
2. The terminal moves to a location where it cannot receive satellite signals; inside a building that blocks satellite reception, for
example.
Typical TTFF
Type of Start Start Description
Cold Start No satellite data has been received for 16 hours
Warm Start No satellite data has been received for 30 minutes
Hot Start No satellite data has been received for 15 minutes
11 - 4
keys.
on page 6-11. A GPS application can prevent this suspend by calls to SystemIdleTimerReset().
Rev F
10/16/07
Resetting the Terminal
Resetting the Terminal on page
Typical TTFF
80 seconds
35 seconds
10 seconds
on page 2-11.
2-11.
Dolphin® 7900 User's Guide