Suspend Threshold - Psion Teklogix PX750 User Manual

Chapter 5: Configuration
Power Properties

5.5.4.3 Suspend Threshold

The Suspend Threshold lets you to determine when NEO will shut down. If the slider is left
at the default value, Maximum Operating Time, the hand-held will run until the battery is
completely empty; the RAM is only backed up for a short period of time. If you choose
Maximum Backup Time, the hand-held will shut off with more energy left in the battery so
RAM can be backed up for a longer period of time.
Important: Selecting 'Maximum backup time' reserves approximately 20% of the
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battery capacity for memory backup. Once the battery is drained, the system
RAM memory is lost and the unit must reboot.
In most real-time transaction environments, this is not a problem (it only
takes a few seconds to boot). However, batch transaction environments,
where data is not saved to a non-volatile memory (a microSD FLASH
card), may need to pay particular attention to this parameter. Psion Tek-
logix does not recommend the storage of any valuable data in system RAM.
The NEO Windows CE 5.0 environment does not store any critical data in
RAM (such as the registry or file system).
If the user's application does not save data to RAM, Psion Teklogix recom-
mends keeping the Suspend Threshold setting as low as possible to
maximize battery run time.