Casio IT-2000W manual Low Voltage Level, LB1, LB2, LB3

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-	Objective	Description
	ion	battery
Low main battery	LB1	Main battery	Indicates that the main battery voltage has
voltage warning			reached a limit level that requires a warning to
level			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	LB2	Sub-battery	Indicates that the sub-battery voltage has
voltage warning			reached a limit level that requires a warning to
level			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	LB3	SRAM card	Indicates that the SRAM card battery voltage
battery voltage		battery	has reached a limit level that requires a
warning level			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.

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