Windows NT Appears Not to Send the DTR Signal to a UPS on Shutdown (164390)
The information in this article applies to:
- Microsoft Windows NT Workstation 3.51
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 3.51
- Microsoft Windows NT Server 4.0
This article was previously published under Q164390
IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, make sure you understand how to restore it if
a problem occurs. For information about how to do this, view the "Restoring
the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key"
Help topic in Regedt32.exe.
SYMPTOMS
When Windows NT goes through the shutdown process after a low battery
message, it appears that Windows NT does not send a DTR signal and the UPS
does not power off.
CAUSE
Windows NT waits approximately 2 minutes before sending out the DTR signal,
allowing enough time for programs and services to shutdown properly. It is
possible that the UPS will run out of power and perform a manual shutdown
before Windows NT sends the DTR signal.
RESOLUTION
It is possible to change the amount of time that elapses from when the Low
Battery message is sent and when Windows NT sends out the DTR signal. You
can use Registry Editor (Regedt32.exe) to add an entry to the registry.
NOTE: You must be logged on with administrative permissions to alter
certain registry settings.
WARNING: Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall your operating system. Microsoft cannot
guarantee that problems resulting from the incorrect use of Registry Editor
can be solved. Use Registry Editor at your own risk.
For information about how to edit the registry, view the "Changing Keys And
Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete
Information in the Registry" and "Edit Registry Data" Help topics in
Regedt32.exe. Note that you should back up the registry before you edit it.
To specify a shut down wait, perform the following steps:
- Start Registry Editor (Regedt32.exe) and go to the following subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\U - From the Edit menu, click Add Value. Type the value ShutdownWait with a
REG_DWORD value in seconds between zero and 600 decimal.
- Quit Registry Editor and restart your computer for the changes to take
place.
| Modification Type: | Major | Last Reviewed: | 2/22/2002 |
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| Keywords: | kbHardware kbprb KB164390 |
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