Casio IT-2000W manual Use of Buzzer From the System, Setting Volume of Buzzer

2.3.8Buzzer

This terminal is provided with a buzzer function that is compatible, via an appropriate interface, with the IBM PC. The application side can sound this buzzer by controlling the I/O port assigned to 61h. It is also possible to modify the sound frequency by controlling channel 2 of the timer.

For information about the method used to modify the frequency refer to the hardware manual of the PC/AT compatible machine.

Use of Buzzer From the System

The IT-2000 system uses the buzzer in the following cases:

At power on (boot).

If the power is turned off by the Power switch.

If the PC card is inserted/removed.

If a key input is accepted (for matrix key and keypad). Enable/disable can be set with the system library. (refer to Chapter 8.6.2 “System Library”)

If the key buffer is full.

At a low battery voltage (LB1).

If an alarm interrupt (INT4Ah) occurs.

When the battery lid is opened while the power is on.

￿At a hardware anomaly.

For calibration and System Menu operation.

Setting Volume of Buzzer

The buzzer volume can be set with System Menu or from the system library.

The volume can be set to one of the four levels: OFF/Small/Medium/Large.

For more information about System Menu and the system library refer to Chapter 3 “System Menu" and Chapter 8.6.2 “System Library” respectively.

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