User's Manual Part 2

UPC-V312-D525 Panel PC
Page 43
3.7.1 ACC ON
NOTE:
In ACC On mode, the Power 1 connector must connect to the ACC on
signal to be able to control system power.
The ACC On mode is designed for vehicle applications. When the UPC-V312-D525 is in
ACC On mode, the main power input is the Power 1 connector and the backup power is
from the Power 2 connector.
3.7.1.1 Boot-up
When both power connectors are connected to the power source with over 9 V, the two
power LEDs on the front panel remain off until the ACC ON signal jumps from low to
high. The user can choose AT power mode or ATX power mode to control the system.
The following flow diagrams show the boot-up process and the LED status in AT and ATX
power modes.
Figure 3-31: ACC On: AT Mode
Figure 3-32: ACC On: ATX Mode
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