Hdd Led (Cn19); Atx Soft Power Switch (Cn21); Sm Bus Connector (Cn29); Atx Feature Connector (Cn20) - Advantech PCA-6188 User Manual

2.15.4 HDD LED (CN19)

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

2.15.5 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.

2.15.6 SM Bus Connector (CN29)

This connector is reserved for Advantech's SNMP-1000 HTTP/SNMP
Remote System Manager. The SNMP-1000 allows users to monitor the
internal voltages, temperature and fans from a remote computer through
an Ethernet network.
CN29 can be connected to CN19 of SNMP-1000. Please be careful about
the pin assignments, pin 1 must be connected to pin 1 and pin 2 to pin 2
on both ends of cable.

2.16 ATX feature connector (CN20)

Connect to the CN1 on the Advantech backplane to enable the ATX func-
tion, 5V stand-by.
PCA-6188
User's Manual
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CN20