Atx Power Connector (Atx1); Power Switch (Jp1); I/O Voltage Selection (Jp7, 8); Figure 3-5: V I/O Voltage Selection - Advantech MIC-3056 User Manual

Figure 3-3: The connector and jumper locations on the rear side.

3.5.1 ATX Power Connector (ATX1)

This connector accepts one standard ATX power supply.
Note: Do not use ATX power supply and plug-in power module at the same time.

3.5.2 Power Switch (JP1)

This connector provides power on/off control of the ATX power supply or the plug-in
power module. If the CompactPCI™ chassis provides a 2-pin power switch cord,
connect this cord to the JP1 connector and users can control the power on/off by the
power switch. Or users can directly short this connector by a jumper and control the
power on/off by the ATX power supply switch.
3.5.3 V I/O Voltage Selection (JP7, 8)
This jumper is used to select the V I/O voltage. The backplane allows
V I/O to be set to either 5 V or 3.3 V. Since the default is configured for use with 5V
CompactPCI™ boards (blue keyed connectors), once the jumper is set to 3.3 V, the
CompactPCI™ keys must be changed to 3.3 V at the same time (as yellow keyed
connectors).

Figure 3-5: V I/O voltage selection

MIC-3056 User Manual -- Page 17