IBM 4800-741 Operation Guide - Page 31

Configuration, switches

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Updated October 31, 2007 Configuration switches The DIP switches are located on the front panel of the UPS subassembly (see A in Figure 9). These switches allow you to select whether the ON or OFF state of the connected system unit controls the operation of the UPS during an AC power outage. Standalone mode: When both switches are set to the OFF or the up position (factory default), the UPS always enters battery mode during an AC outage. The unit remains in battery mode until AC is restored or until the battery is discharged. On-battery and low-battery signals are available to the associated system when an RS-232 cable connection is in place, but there is no control of the UPS from the system unit. This mode of operation is typical for the standby type of power supplies commonly found in the marketplace. Host-dependent mode: The host-dependent mode is when both DIP switches are set in the ON or down position. During an AC outage, the UPS does not remain in battery mode for more than five seconds unless there is an active RS-232 connection present from a powered-on system unit. If the system unit is powered on, the UPS remains in standby mode. If the system unit is powered off, the unit does not stay in standby mode. When AC power is restored, AC power is again available at the UPS output. This setting is useful for situations where systems units are powered down at the close of business and the main store power is also shut down. This setting prevents the UPS from switching into standby mode and discharging the battery when the store power is removed. A Figure 9. Location of UPS configuration switches Chapter 1. Introducing the SurePOS 700 Models 11

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Configuration
switches
The
DIP
switches
are
located
on
the
front
panel
of
the
UPS
subassembly
(see
±A²
in
Figure
9).
These
switches
allow
you
to
select
whether
the
ON
or
OFF
state
of
the
connected
system
unit
controls
the
operation
of
the
UPS
during
an
AC
power
outage.
Standalone
mode:
When
both
switches
are
set
to
the
OFF
or
the
up
position
(factory
default),
the
UPS
always
enters
battery
mode
during
an
AC
outage.
The
unit
remains
in
battery
mode
until
AC
is
restored
or
until
the
battery
is
discharged.
On-battery
and
low-battery
signals
are
available
to
the
associated
system
when
an
RS-232
cable
connection
is
in
place,
but
there
is
no
control
of
the
UPS
from
the
system
unit.
This
mode
of
operation
is
typical
for
the
standby
type
of
power
supplies
commonly
found
in
the
marketplace.
Host-dependent
mode:
The
host-dependent
mode
is
when
both
DIP
switches
are
set
in
the
ON
or
down
position.
During
an
AC
outage,
the
UPS
does
not
remain
in
battery
mode
for
more
than
five
seconds
unless
there
is
an
active
RS-232
connection
present
from
a
powered-on
system
unit.
If
the
system
unit
is
powered
on,
the
UPS
remains
in
standby
mode.
If
the
system
unit
is
powered
off,
the
unit
does
not
stay
in
standby
mode.
When
AC
power
is
restored,
AC
power
is
again
available
at
the
UPS
output.
This
setting
is
useful
for
situations
where
systems
units
are
powered
down
at
the
close
of
business
and
the
main
store
power
is
also
shut
down.
This
setting
prevents
the
UPS
from
switching
into
standby
mode
and
discharging
the
battery
when
the
store
power
is
removed.
A
Figure
9.
Location
of
UPS
configuration
switches
Updated
October
31,
2007
Chapter
1.
Introducing
the
SurePOS
700
Models
11