Installation guide

Chapter 2 Installation 23

Power LED and keylock (CN8)

You can connect an LED to indicate when the CPU card is on. Pin

1 of CN8 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

do not 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 (CN8)

Pin Function

1 LED Power (+5 V)

2NC

3 GND

4 Keyboard lock

5 GND

Reserved IR connector (CN9)

Pin Function

1 Vcc

2 FIR_RX

3 IR_RX

4 GND

5 IR_TX