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- DOCUMENT:Q105308 23-FEB-1994 [W_NT]
- TITLE :Windows NT May Cause APC Smart UPS Battery to Discharge
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:BUGLIST3.10
-
- ----------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system version 3.1
- - Microsoft Windows NT Advanced Server version 3.1
- ----------------------------------------------------------------------
-
- SYMPTOMS
- ========
-
- When Windows NT is booted, if an American Power Conversions (APC)
- Smart UPS is installed, its battery may be discharged or the UPS
- function may be shutdown.
-
- CAUSE
- =====
-
- During the boot sequence, Windows NT writes configuration/detection
- code to the COM Port to determine baud rate, FIFO information, and for
- mouse detection. The string written to the port may contain the letter
- "D," which the Smart UPS interprets as a command to discharge the
- battery. The string may also contain the letter "S," which will cause
- the Smart UPS to shutdown.
-
- The Smart UPS interprets the string incorrectly only if it has already
- been placed in the "Smart Mode" prior to starting Windows NT. The user
- must have already placed the UPS in the Smart Mode using the software
- supplied by American Power Conversions; otherwise the Smart UPS will
- be unaffected by the signal Windows NT sends to the COM Ports.
-
- RESOLUTION
- ==========
-
- The Smart UPS can be used successfully by temporarily disconnecting
- the cable from the COM Port during the Windows NT boot sequence. The
- user can also reset (power off, then on) the UPS to return to the
- default UPS mode. NOTE: This also has the effect of interrupting power
- to the computer.
-
- American Power Conversions is currently working on a Windows NT driver
- that will take full advantage of the Smart UPS unit's capabilities.
-
- The Smart UPS is manufactured by American Power Conversions, a vendor
- independent of Microsoft; we make no warranty, implied or otherwise,
- regarding this products' performance or reliability.
-
- Additional reference words: 3.10
- KBCategory:
- KBSubcategory: hrdwr
-
- =============================================================================
-
- THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
- PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
- ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
- EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
- ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
- CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
- MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
- OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
- SO THE FOREGOING LIMITATION MAY NOT APPLY.
-
- Copyright Microsoft Corporation 1994.