External switches and LEDs

Power LED and keylock (KEY LOCK)

You can connect an LED to indicate when the CPU card is on. Pin 1 of KEY LOCK supplies power to the LED; Pin 3 is the ground.

You can use a switch (or a lock) to disable the keyboard. In this state the PC will not respond to any input. This is useful if you don’t want anyone to change or stop a running program. Simply connect the switch between Pins 4 and 5. The pin assignments appear in the following table:

Power LED and keylock (KEY LOCK)

Pin Function

1LED Power (+5 V)

2No Connector

3Ground

4Keyboard lock

5Ground

External speaker (EXT SPK)

The CPU card has its own buzzer. You can disable the internal buzzer and connect an external speaker to EXT SPK. Enabling the external speaker automatically disables the internal buzzer.

External speaker (EXT SPK)

Pin Function

1Vcc

2Speaker output

3Buzzer in

4Speaker output

30SBC-455 User's Manual

Page 38
Image 38
Intel SBC-455 manual External switches and LEDs, Power LED and keylock KEY Lock, External speaker EXT SPK