Casio IT-2000D User Manual

Page 31

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

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.

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.

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

Power Status.