22 PCA-6157 User's Manual
Power LED and keylock (J5)
You can connect an LED to indicate when the CPU card is on. Pin 1
of J5 supplies power to the LED, and 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 of J5. The pin assign-
ments for J5 appear in the following table:
Power LED and keylock (J5)
Pin
Function
1
LED Power (+5 V)
2
No Connection
3
Ground
4
Keyboard lock
5
Ground
SMI switch (J7)
The PCA-6157 generates an external system management active
interrupt. When J7 is given a short trigger, the CPU card could
enter the sleep mode as part of the "Green Function".
