IEI Technology UPC-V315-QM77, User Manual, Page: 54 / 145

UP C-V315-QM77 P a n e l P C
P a g e 42
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-V315-QM77 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 Bo o t-u p
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 3-33: ACC On: AT Mode
Figure 3-34: ACC On: ATX Mode