Intermec 6200 Reference Guide

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Suspended

System or device is placed in a lowĆ or noĆpower state from which it cannot

resume without special system or user intervention (button press, etc.).  All

volatile state information is maintained; most external events are not

detected.  Also, events detected during suspend typically resume the

system; they may not be processed.  For example, a suspended system may

be configured to resume when an RI is seen on a PC Card modem.

However, the first ring might just wake the system up and might not be

detected by the communications software.  The second ring would probably

be seen by the software because time had elapsed for the system to resume

and continue processing.

NORAPM.DLL monitors the Windows task scheduler to detect the CPU idle

state.  When the idle state is detected, the CPU and other components are placed

into a lowĆpower state until the next hardware interrupt occurs.  The system

then returns to full speed to process the interrupt and any Windows events

created by the interrupt.
When an application is idle, 95 percent of the CPU current can usually be saved.

This saving is in addition to the power savings from other system components

that are idled or that consume less power because they are not being gated by

the CPU.  See Power Management Programming Interface for Windows, page

3Ć17, for suggestions on maximizing power savings in an application or driver.

NORAPM.DLL attempts to save power by monitoring user and system activity.

User activity consists of direct input from the user, such as keyboard or digitizer

input.  The presence of user activity implies that user interface devices such as

the digitizer, keyboard, display, and backlight should remain active.  (See the

 entry on page 3Ć10.)

System activity consists of user activity plus activity generated by ongoing

processing or communications.  Examples of system activity, aside from user

input, are serial communications and direct calls made to the NORAPM

SystemActivity()

 function by busy applications.  The presence of system

activity implies that the system is actively processing and may not be suspended,

although the user interface devices may be turned off if no user activity is

detected.  (See the 

 

entry on page 3Ć10.)

NORAPM.DLL monitors the following types of activity.  Monitoring is subject to

the configuration settings described in the preceding paragraphs.
Window Messages:

WM_COMMNOTIFY (system)
WM_MOUSEMOVE

(user)

WM_RCRESULT

(user)

WM_KEYDOWN

(user)