Casio IT-2000W - Manual (Page 30)

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Sub-battery Voltage Monitoring
The sub-batteries are used for system backup while the main battery is being replaced. The sub-
batteries consists of two units: the primary sub-battery (button-type lithium battery) and secondary
sub-battery (button-type lithium-vanadium battery). The secondary sub-battery is recharged by the
voltage of the main battery.
While the fully charged main battery is installed , the entire system is backed-up by the main battery,
and the secondary sub-battery is charged by the voltage of the main battery. If the main battery is
removed, the job of system backup shifts to the secondary sub-battery. If the secondary sub-battery
voltage drops below the required level while the main battery is removed, the backup job shifts to
the primary sub-battery (refer to “Battery Operation Scheme” on page 27.).
Application programs are permitted, through the system library, to monitor this primary sub-battery
voltage and determine if it is lower than the warning level (LB2). However the system side will not
issue a warning about the low voltage level (LB2) of the primary sub-battery. Therefore, the
application program must monitor the primary sub-battery voltage via the system library and inform
the user that it must be replaced.
For information about the method used to replace the sub-battery refer to Chapter 2.2.6 “How to
Replace or Recharge Batteries”.
SRAM Card Battery Voltage Monitoring
This function monitors the SRAM card battery voltage. Application programs are permitted, through
the system library, to monitor this voltage and determine if it is lower than the warning level (LB3).
However, the system side will not issue a warning about the low voltage level (LB3) of the SRAM
card battery. Therefore, the application program must monitor the SRAM card battery voltage via
the system library and inform the user that it must be replaced.
For information about the method used to replace the SRAM card battery refer to Chapter 2.2.6 “
How to Replace or Recharge Batteries”.
Acquiring Power Status through APM BIOS
This terminal has APM 1.1 installed. This makes it possible for application programs to obtain
information, such as the percentage of battery voltage remaining or the connector status, via the
APM BIOS. For more information refer to Chapter 9.5 “Remaining Battery Voltage Display
Utility”.
Acquiring Power Status through Battery Status Acquisition Utility
With the battery status acquisition utility the user can be advised of the current remaining voltage of
the main battery, sub-battery status, or connector status in real time. For more information refer to
Chapter 9.5 “Remaining Battery Voltage Display Utility”.