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OS/2 Help File
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1998-05-17
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9KB
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183 lines
ΓòÉΓòÉΓòÉ 1. SD/2 Help for Help ΓòÉΓòÉΓòÉ
SD/2 - ShutDown/2 Version 1.01
for IBM OS/2 2.x Presentation Manager
Copyright (C) by Stangl Roman 06, 1993
Copyright (C) by Friedrich Schmieder 06, 1993
Please select one of the following topics for further information:
o About the utility SD/2
o SD/2 Configuration Menu
<Backward> <Forward>
ΓòÉΓòÉΓòÉ 2. Help for About SD/2 ΓòÉΓòÉΓòÉ
SD/2 - ShutDown/2 Version 1.01
for IBM OS/2 2.x Presentation Manager
Copyright (C) by Stangl Roman 06, 1993
Copyright (C) by Friedrich Schmieder 06, 1993
E-Mail:
o rstangl@vnet.ibm.com (Roman Stangl)
o SFRIEDRICH@vnet.ibm.com (Friedrich Schmieder)
ShutDown/2 - SD/2 is an OS/2 PM application, that controls your PS/2 in
conjunction with an external uninterruptable power supply (UPS) control logic.
It will protect you system from any data losses and hardware damages caused by
unexpected line power failures. If line power fails, SD/2 and the external UPS
control logic will shut down your system safely.
The following figure shows, how SD/2 and the external UPS control logic work
together:
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Your PS/2 UPS control UPS Line power
logic
The UPS control logic is attached to the UPS on one side, and to your PS/2 on
the other side. Your PS/2 is also attached to the UPS. The UPS has a battery
inside, to supply your system with power for short periods, if line power
fails. Such periods are typically 5 to 30 minutes, enough time to shut down
your system to avoid data losses or hardware damages.
The UPS control logic is attached to your PS/2 on any serial or parallel port.
SD/2 snoops at the configured port for line power failures, which are indicated
by the UPS control logic. Power failures may vary in their duration, short
failures are simply ignored, because the UPS has enough battery capacity to
allow further operation of your system. Some failures however, may be too long
to allow further operation of your system, so SD/2 shuts it down. Immediately
after your system was shut down, it is safe to power it off, and this job is
done by the UPS control logic.
If line power reappears again, the UPS control logic will power on your system
again. Your system will be rebooted and normal operation will continue.
SD/2 and the UPS control logic define 4 time stamps, which are defined
according to the size of the UPS and the power requirements of your system:
UPS Battery Capacity
This time stamp determines the maximum period the UPS can be allowed
to supply your system before the UPS battery is empty.
Alert Start
This time stamp determines the duration of line power failures that
can safely be ignored without interrupting your system.
Alert ShutDown
This time stamp determines when an user defined application is
started, to prepare your system for a shut down.
SD/2 ShutDown
This time stamp determines when your system will be shut down after
line power disappears. Once this time stamp is reached, a reappearing
line power can't prevent your system from shut down.
SD/2 can be controlled from Parallel or Serial ports, you just have to find out
from your PC's User's Guide and BIOS which physical connector is configured for
which address. For example, the logically first printer port LPT1 historically
was controlled by the physical address 0x3BC, however since advanced printer
functions as ECP or EPP were introduced, LPT1 is controlled by the physical
address 0x278. In other words, there is no standard rule, but (HW and BIOS)
implementation specific, in the <Setup dialog> you have to ensure that the
physical addresses match.
For parallel ports SD/2 senses the status of the pins +BUSY (pin 11) and -ACK
(pin 10), an external logic is controlled by the pins -SLCT IN (pin 17) and
-INIT (pin 16). Due to the way these pins are used, you should even be able to
loop your UPS logic between your PC and printer and the printer should still
work. SD/2 detects that the UPS is running from its internal battery when both
pins 11 and 10 are connected to ground (e.g. for a test plug, just connect
ground from pins 25 and 24 to pins 11 and 10, once you attacht that plug, SD/2
will start its processing).
For serial ports SD/2 senses the status of the pins CTS (pin 5 on DB25) and CD
(pin 8 on DB25), an external logic is controlled by the pins DTR (pin 20 on
DB25) and RTS (pin 4 on DB25). Due to the way these pins are used, you should
even be able to loop your UPS logic between your PC and your serail device and
the serial device should still work. SD/2 detects that the UPS is running from
its internal battery when pin 5 (on DB25) is connected to positive voltage (a
logical "0" in serial communication terms) and pin 8 (on DB25) is connected to
negative voltage (a logical "1" in serial communication terms) (e.g. of course
you can build a test plug too, but it's a little bit more difficult to the the
serial RS232 voltage levels, you might e.g. use DOS' DEBUG to output them on
pins unused by SD/2 or on a different serial port).
<Backward> <Forward>
ΓòÉΓòÉΓòÉ 3. Help for SD/2 Setup ΓòÉΓòÉΓòÉ
This dialog is used to setup the cooperation between SD/2 and the UPS control
logic. Some entryfields are editable by the user, some entryfields are
predefined for a particular UPS and PS/2 configuration.
For the following explanation assume that line power fails at 10:30 and the
configuration corresponds to your UPS and PC/2 configuration:
UPS Battery Capacity
Assume that the UPS battery capacity is 0:10. Because the battery of
the UPS lasts at least 10 minutes, the system must be shut down at
10:40 at the latest, to avoid data losses or hardware damages due to
uncontrolled power off of your system. All time stamps must occur
between 10:30 and 10:40.
Alert Start
Assume that the alert start is 0:1. Therefor at 10:31 SD/2 will
inform the user that the line power failed, and the system is
operating from the UPS battery. The first minute is ignored, because
it is safe to ignore short glitches of up to one minute.
Alert ShutDown
Assume that the alert shut down is 0:4. At 10:34, a user defined
application will be started to prepare the system for shut down.
SD/2 ShutDown
Assume that SD/2 shut down is 0:7. At 10:37 SD/2 will signalize the
UPS control logic to power off your system after SD/2 will have shut
down your system, which lasts about 2 seconds. Thus 10:37 is the
point of no return, even if line power reappears, your system will be
shut down. If line power reappears before this time stamp (f.e. at
10:35), SD/2 will restart the countdown at the beginning, repeating
this procedure immediately after the next line power disappearance.
Application started at Alert ShutDown.
These entryfields allow the user to select the application that is
started after the Alert ShutDown time stamp is reached. The user has
to insert at least the path and filename of an application.
UPS controls SD/2 via
These radiobuttons allow the user to select the port of the PS/2
where SD/2 and the UPS control logic communicate over. The user can
select any serial or parallel port.
CAUTION:
Be sure that the UPS control logic is attached to the port that is
specified! Data may be lost or hardware may be damaged, if SD/2 is
configured to a port where the UPS control logic is not attached and
line power fails!
ShutDown User Information
This multiline entryfield contains the text that is displayed,
immediately before your system is shut down, until your system is
reset by ALT+CTRL+DEL or by a power off. The UPS control logic will
power off your system shortly after this message is displayed.
Warning: Be sure to verify all data before you press OK to prevent misfunction
of SD/2 and the UPS control logic!
<Backward> <Forward>