22 PCA-6144V User's Manual
Keyboard pin-header connector (CN14)
The PCA-6144V has a pin-header connector to support passive
backplane applications. Pin functions are as follows:
Keyboard pin-header connector (CN14)
Pin
Function
1
KB clock
2
KB data
3
NC
4
GND
5
+5 VDC
Power LED and keylock (CN15)
You can connect an LED to indicate when the CPU card is on. Pin
1 of CN15 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 do
not want anyone to change or stop a running program. Simply
connect the switch between Pins 4 and 5 of CN15. The pin
assignments for CN15 are as listed below:
Power LED and keylock (CN15)
Pin
Function
1
LED power (+5 V)
2
VCC
3
GND
4
Keyboard lock
5
GND
