External Speaker (Cn3) - Advantech PCA-6175 Manual

B.13 External Speaker (CN3)
The CPU card has its own buzzer. You can also connect it to the
external speaker on your computer chassis.
Table B-13: External speaker (CN3)
Pin
1
2
3
4
PCA-6175 User's Manual
70
Function
+5 V
CC
GND
Internal buzzer
Speaker out