NCR RealPOS 72XRT POS, User Manual

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1-20 Product Overview
Power Management
Power management is implemented on the 7616 terminal using the Advanced
Configuration and Power Interface (ACPI) 3.0b specification. A key feature of ACPI is
that the operating system, not the BIOS, configures and implements power
management.
USB Wakeup
Wakeup from a USB device is dependent on which USB port is used. The port must be
powered in order to work. Only the rear I/O Panel USB 2.0 ports can be used for
Wakeup, not the Daughter Card or Front Panel ports.
Definitions of the States
G3 Mechanical Off
A computer state that is entered and left by a mechanical means.
Example:
Turning off the system's power through the movement of a large red
switch.
Various government agencies and countries require this operating mode. It is implied by
the entry of this off state through a mechanical means that no electrical current is
running through the circuitry and that it can be worked on without damaging the
hardware or endangering service personnel. The OS must be restarted to return to the
Working state. No hardware context is retained. Except for the real-time clock, power
consumption is zero.
G2/S5 Soft Off
A computer state where the computer consumes a minimal amount of power. No user
mode or system mode code is run. This state requires a large latency in order to return
to the Working state. The system's context will not be preserved by the hardware. The
system must be restarted to return to the Working state. It is not safe to disassemble the
machine in this state.
G1 Sleeping
A computer state where the computer consumes a small amount of power, user mode
threads are not being executed, and the system appears to be off (from an end user's
perspective, the display is off, and so on). Latency for returning to the Working state
varies on the wake environment selected prior to entry of this state (for example,
whether the system should answer phone calls). Work can be resumed without
rebooting the OS because large elements of system context are saved by the hardware
and the rest by system software. It is not safe to disassemble the machine in this state.