Hdd Led (Cn19); Atx Soft Power Switch (Cn21); Atx Power Control Connectors (Cn20 And Cn21); Atx Feature Connector (Cn20) And Soft Power Switch Connector (Cn21) - Advantech PCA-6178VE Manual

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.
2.14 ATX Power Control Connectors (CN20
and CN21)
Note:
2.14.1 ATX feature connector (CN20) and soft power
switch connector (CN21)
The PCA-6178 can support an advanced soft power switch function if
an ATX power supply is used. To enable the soft power switch
function:
1. Take the specially designed ATX-to-PS/2 power cable out of the
PCA-6178's accessory bag.
2. Connect the 3-pin plug of the cable to CN20 (ATX feature connec-
tor).
3. Connect the power on/off button to CN21. (A momentary type of
button should be used.)
Note:
PCA-6168 User's Manual
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Refer to the diagram on the previous page for the
location of CN21.
If you will not be using an ATX power connector,
make sure that pins 2-3 are closed.