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Low Voltage Level
The IT-2000 continuously monitors the voltage of the main battery, the primary sub-battery, and the
SRAM card battery. This allows an application program to determine through the system library if
the voltage of each battery reaches a warning level.
The following table summarizes the low battery voltage warning levels, which application programs
can acquire through the system library.
Name Abbreviat-
ion
Objective
battery
Description
Low main battery
voltage warning level
LB1 Main battery Indicates that the main battery voltage
has reached a limit level that requires a
warning to be issued. The system sounds
the buzzer to issue an alarm. If this
occurs, the user must replace the main
battery within ten minutes. If the battery
is not changed within ten minutes, the
system automatically executes the
suspend process.
Low sub-battery
voltage warning level
LB2 Sub-battery Indicates that the sub-battery voltage has
reached a limit level that requires a
warning to be issued. Since the system
does not issue an alarm, the application
program must execute a warning by
acquiring the status from the system
library.
The sub-battery must be replaced
according to the procedure described later.
Low SRAM card
battery voltage
warning level
LB3 SRAM card
battery
Indicates that the SRAM card battery
voltage has reached a limit level that
requires a warning to be issued. Since the
system does not issue an alarm, the
application program side must execute a
warning by acquiring the status from the
system library. The SRAM card battery
must be replaced according to the
procedure described later.
There is also a main battery inoperable level (LB0). This is the status of the main battery when its
voltage falls below LB1. If this happens, the system executes an emergency power off (critical
suspend). Therefore, this level is also referred to as the emergency escape process level.
This status cannot be acquired from the application side, since the system turns off the power as
soon as the voltage reaches LB0.