DCT Antares SB, Руководство пользователя

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4.5. *EVENT MACHINE
Now, every time S and P are both true at the same time, C is going to be
true too. Whenever S or P become false, C will become false.
The situation we just created (named C) is useful for detecting an speed
limit violation within a cities’ perimeter. With C we specify that we are
interesting not only on detecting a general speed violation but an specific
speed limit for an specific city boundary. Note that a cities’ perimeter is
just an example: We could have specified a road or a small neighborhood.
You can create simple triggers which go off whenever a single specific situa-
tion occurs, like when a vehicle’s emergency button wired to a unit’s input
is activated. Or you can construct more complex triggers by combining
situations with the logical operators named above like it was done on the
previous example. Having this is mind different triggers may be created to
accomplish tasks like:
•
Sense a panic button to send the current vehicle’s position to different
destinations, including the vehicle’s owner cellular phone (through a
SMS).
Have the unit make a voice call is also possible. This will make the
cabin’s audio available to a predefined phone number whenever the
driver presses the alarm button.
•
Speed limit monitoring which includes a time condition (seconds) and
a visual advisory (using an output) that gives the driver a chance to
slow down before the actual speed violation is reported.
• Generate an alarm report whenever the primary power is discon-
nected. The optional unit’s internal back up battery enables the unit
to keep on working even when the vehicle’s battery is disconnected.
This prevents thieves to easily disable power to the unit.
•
Generate a report when a vehicle goes out of a predefined polygonal
region.
•
Sense and report the back-up battery level status.
•
Use different reporting criteria according to the time of the day.
•
Generate a reconnection message to a TCP server whenever the socket
gets reconnected.
•
Generate a distance report whenever the vehicle’s traveled distance
reaches a predefined threshold. (The virtual gps-based odometer is
not 100% precise)
•
Use the communication channels available to the unit on a cost ef-
fective way as they start failing: You can enable the unit to always
send its report via GPRS and only use SMSs when GPRS goes down,
finally if all GSM goes down too you can attach another type of last
option communication media like a satellital modem to the unit’s se-
rial port and tell the unit only to use it when both GPRS and GSM
are down. This gives a full communication coverage at a cost effective
schema.
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