Advantech PCA-6181, Manual, Page: 120 / 126

106 PCA-6181 User's Manual
B.10 Power LED (CN16)
You can use an LED to indicate when the CPU card is on. Pin 1 of
CN16 supplies the LED's power, and Pin 3 is the ground.
Table B-10: Power LED and keylock connector (CN16)
Pin Function
1 LED power (+5 V)
2 NC
3 GND
4 Reserved
5 GND
B.11 External Speaker Connector (CN17)
The CPU card has its own buzzer. You can also connect it to the
external speaker on your computer chassis.
Table B-11: External speaker (CN17)
Pin Function
1 +5 V
CC
2 GND
3 Internal buzzer
4 Speaker out