Atx Suspend Power Connector(Cn23); System Fan Connector (Cn25); Smbus Connector (Cn26); Hardware Fail Led (Cn27) - Advantech PCA-6781 User Manual

2.24

ATX Suspend Power connector(CN23)

The PCA-6781 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
2. Connect the 3-pin plug of the cable to CN23 (ATX feature connector).
3. Connect the power on/off button to CN1.
Default value is set CN23 to short pin1-2.
Important Make sure that the ATX power supply can take at least a 10 mA load on the
5 V standby lead (5 VSB). If not, you may have difficulty powering on your system.
Warning! If the board is used under AT Mode, besides setting J3 to AT Mode,
please also make sure PCA-6781's CN23 PIN1 and PIN2 should be
connected to jumper for stable V5REF_Sus voltage supply. CN23
default value is set to short PIN1 and PIN2.
2.25

System FAN connector (CN25)

The PCA-6781 is equipped with a 3-pin FAN connector providing +12 V power for
system FAN.
2.26

SMBus connector (CN26)

The PCA-6781 is equipped with a 4-pin SMBus connector providing SMBus for
peripheral usage.
2.27

Hardware Fail LED (CN27)

The PCA-6781 is equipped with 2-pin hardware fail pin header to connector with
LED. If you connect CN27 with LED, LED will light when buzzer on PCA-6781 has a
warning noise.
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19 PCA-6781 User Manual