REFERENCES
121
4.5 POWER SAVE
4.5.1
Sleep State
/
USB Suspend
When using standard devices, this mode allows the
μ
P in the reader to enter a
“Sleep” state for minimum power consumption. This command is only valid when
hardware trigger type is selected.
Before entering Sleep mode, the following are verified:
•
no commands coming from Host
•
no data being transmitted to Host
•
Enter Sleep Timeout ended (see par. 4.5.2)
It is possible to exit Sleep mode either by pressing the button/trigger or by inserting
the reader into the Stand (only for devices with Stand Recognition Beep).
Enabling the Sleep State/USB Suspend implements Standby mode for CCD devices,
see par. 4.5.3.
When using USB devices, this mode allows the device to manage Selective Suspend
conditions generated by the Host Operating System in which optimizing low power
consumption (ex. Windows Stand-by). It is possible to exit the Suspend mode either
from the Host (ex. moving the mouse during Stand-by) or through the barcode
reader. The latter, called Remote Wakeup, makes the device wake up the Host
restoring the communication. Remote Wakeup is possible either by pressing the
button/trigger or by putting the reader into the stand (only for devices with Stand
Recognition Beep).
4.5.2
Enter Sleep Timeout
For readers that have the Sleep state enabled, this timeout determines when the
reader will enter this state.
4.5.3
Standby
(only for CCD devices)
If this command is enabled, part of the CCD circuitry shuts down (Standby), in order
to optimize low power consumption when not reading. When the trigger is pressed
this circuitry powers up. This mode causes a minor delay before the reader is ready.
Summary of Contents for Hand-Held Devices II
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