Advantech-DLoG
DLT-V6210 Manual V1.00
Page 41 / 56
10.
Automatic shut down
10.1. Functional description
DLT-V6210 is equipped with an automatic shut down module.
If wired up accordingly, DLT-V6210 conveniently switches off together with the ignition.
As disconnecting the power supply during operation can lead to data loss, the operating system needs
to be shut down normally by using the appropriate hardware and software installed on the system when
the ignition is switched off.
DLT-V6210 is connected with three supply cables.
DC+ and DC- are directly connected to the power supply, the connection is of course run through fuses.
The supply voltage is then linked to DLT-V6210’s ignition input via a switch, for example, the key switch
of the ignition (also with a fuse).
10.2. Sequence
When the ignition is turned on or DLT-V6210 <Power> button is pressed, DLT-V6210 checks its internal
temperature and runs a test to confirm that the automatic shut down function is working.
If the check of the environmental conditions is successful, DLT-V6210 starts the operating system
normally.
Once these checks are completed, DLT-V6210 starts the operating system. No environmental conditions
(e.g. the internal temperature of the device or the state of the ignition input) are checked for one minute
during startup.
After one minute, DLT-V6210’s internal temperature and the state of the ignition input are constantly
monitored.
If DLT-V6210’s internal temperature reaches a critical level, shutdown of the operating system will be
carried out. The computer will remain switched off until the temperature is once again within the
permitted range.
If the ignition input is
grounded or isolated during normal operation of DLT-V6210, the device will switch
to a delayed shut-off state.
The device will continue to operate normally in this state until the shut-off delay (e.g. 20 minutes) has
elapsed.
If the ignition is turned on again during this shut-off delay, DLT-V6210 will revert to a normal operational
state.
Once the shut-off delay (afterrun time) has elapsed, the operating system will shut down and the device
will automatically shut down (e.g. after one minute or a signal from the operating system).
Device shut down
If the operating system is shut down, all applications will be notified via the Windows message
“WM_QUERYENDSESSION” first.
Every application must then respond within the time set in the registry. If there is no response within the
preset time, the application will be hard-terminated.
It may not be possible to close an application automatically if it has unsaved data. For example, the
WORDPAD.EXE program (included in Windows) cannot be closed automatically if there are unsaved
changes. In such a situation, WORDPAD.EXE will acknowledge the “WM_QUERYENDSESSION”
Windows message by prompting the user to choose whether to save it or not.
All applications that can be terminated without user confirmation using the keyboard shortcut <ALT> +
<F4>, which will normally also respond correctly to the “WM_QUERYENDSESSION” message and
therefore do not need to be hard-terminated.
