External Speaker (Cn17); Reset (Cn18); Hdd Led (Cn19); Atx Soft Power Switch (Cn21) - Advantech PCA-6186 User Manual

2.13.2 External speaker (CN17)

CN17 is a 4-pin connector for an extenal speaker. If there is no external
speaker, the PCA-6186 provides an onboard buzzer as an alternative. To
enable the buzzer, set pins 3-4 as
closed

2.13.3 Reset (CN18)

Many computer cases offer the convenience of a reset button. Connect the
wire from the reset button

2.13.4 HDD LED (CN19)

You can connect an LED to connector CN19 to indicate when the HDD is
active.

2.13.5 ATX soft power switch (CN21)

If your computer case is equipped with an ATX power supply, you should
connect the power on/off button on your computer case to CN21. This
connection enables you to turn your computer on and off.
PCA-6186 User's Manual 22