Advantech TREK-688 User Manual page 44

The power of system can be controlled with the following events:
z
Ignition ON
The ignition signal can be used to power on or shutdown the system. When the system is in an OFF
state and the ignition is turned ON, the VPM controller will countdown a delay period (ON_DELAY).
Once it counts to zero, the system will be powered on.
z
Ignition OFF
When the system is powered on and the ignition is turned off, the VPM controller will countdown a
delay period(OFF_EVENT_DELAY). During this period, if the ignition
is switched back to ON, the VPM controller will stop countdown and reset the OFF_EVENT_DELAY. If
OFF_EVENT_DELAY counts to zero, the VPM controller will trigger an power off event (i.e. power
button press). System and applications which receives this event can do pre defined tasks, like storing
data and preparing to turn off the system.
After the event is triggered, VPM controller starts to countdown next delay period (HARD_OFF_DELAY).
If HARD_OFF_DELAY counts to zero, the system power will be cut off abruptly to avoid unexpected