Advantech PCA-6774 user manual ATX power control connector CN20,CN21

2.10 ATX power control connector (CN20,CN21)

2.10.1ATX feature connector (CN20) and soft-on power button connector (CN21)

The PCA-6774 can support an advanced soft power switch function, if an ATX power supply is used. To enable the soft power switch function:

1.Get the specially designed ATX-to-EBX power cable (PCA-6774 optional item, Part No. 1703200100)

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.)

Important Make sure that the ATX power supply can take at least a 10 mA load on the 5 V standby lead (5VSB). If not, you may have difficulty power- ing on your system.

to CN1 ATX

features connector

ATX power supply

to main power

connector CN8

20-pin female connector

Figure 2.3: Wiring for ATX soft power switch function

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