Server Technology PP02 - Manual (Page 50)

Starting with the power OFF and the LED off, pressing the button once will turn power ON and the LED will go on
green. Pressing the button a second time will signal a ShutDown to the Windows NT/2000/XP system and the LED will
start to blink, indicating a ShutDown has been started. After 3 minutes and 30 seconds, the ShutDown will be complete,
and power will turn off automatically. If you wish to turn power off before the 3 minute 30 second ShutDown delay
automatically expires, pressing the button a third time will turn power off immediately.
With the button working this way, a user at the Windows NT system would turn power ON by pressing the button once.
When the user is ready to turn the system off, the user only needs to press the button again. The user does not even have
to manually perform a shut down -- pressing the button will cause the Power On/Off +Aux ShutDown/
RE BOOT unit to
automatically shut down Windows, turning the power OFF 3 minutes and 30 seconds later.
M ODEM and A UX port disengage:
During the 3 minute 30 second ShutDown Delay period, both the M ODEM and A UX ports will automatically be disabled
(disengaged). This will avoid incoming calls causing potential problems that might otherwise occur if the modem were
to answer during the shutdown process.
Windows NT UPS Service Configuration
Windows NT, versions 3.51+, includes a service for an Uninterruptible Power Supply (UPS). Typically, this service
starts when NT boots, prior to a login, and monitors signals from a UPS. When a UPS detects a utility failure and
switches to battery power, the UPS signals the UPS Service to let NT know that a limited amount of run-time is left
before the batteries run down. In response, after a configured amount of battery run-time, the UPS Service initiates a safe
and orderly shut down of the operating system to prepare for the impending power loss.
All of this is accomplished by the UPS Service monitoring two pins on a serial port. One pin signals a Power Failure and
the other pin signals a Low Battery condition.
When the NT system is connected to a UPS, the Power Failure pin is signaled when the UPS detects a power failure and
switches to battery. When the battery runs down, the UPS Low Battery pin is signaled. With a UPS, the UPS Service is
typically configured with the documented run-time of the batteries in the UPS. Thus, when a power failure occurs, the
UPS service knows how long it can continue to run before having to shut down. During this run-time, notifications are
made to the users of the system that a power failure has occurred and that they should finish their work before the
impending shut down occurs. After the configured run-time, or if a Low Battery signal occurs during the run-time, the
UPS Service initiates a shut down. After the shut down is complete it will be safe for the system to lose power, either by
the batteries running out or by the UPS turning off in response to a Remote UPS ShutDown signal from the UPS Service
(supported on some UPSs).
Remote Power On/Off Appendix C | Windows NT/2000/XP ShutDown • 50