APC UPS with Compaq Prosignia: Low Battery Signal Fails (106170)
The information in this article applies to:
- Microsoft LAN Manager 2.2
This article was previously published under Q106170 SYMPTOMS
When connecting an American Power Conservation (APC) uninterruptible
power supply (UPS) to the serial port of a Compaq ProSignia running
Microsoft LAN Manager 2.2 with the low battery signal check enabled
in LANMAN.INI, the server shuts down during initialization even under
normal UPS operation. Specifically, this happens when the UPS
subservice is started, especially on faster 486 machines.
CAUSE
On startup, the LAN Manager UPS service sends a handshake signal to
the UPS device by briefly asserting the shutdown signal (the DTR line
of the serial port) and the UPS responds by briefly asserting the low
battery signal (the DCD line of the serial port). Rather than look for
a response to the handshake, the LAN Manager UPS service samples the
serial port for the initial state of the UPS. On fast machines it sees
the UPS response of the low battery signal, interprets it as a real
signal, and begins shutdown.
WORKAROUND
Ignore the low battery settings and set the battery time to an
appropriate value (such as 30 minutes = 1800 seconds) in LANMAN.INI:
[ups]
batterytime = 1800
signals = 101
RESOLUTION
The fix for this problem is CSD00.060.
| Modification Type: | Major | Last Reviewed: | 9/30/2003 |
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| Keywords: | KB106170 |
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