DCT Antares SB, Руководство пользователя

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4.9. USING TIME WINDOWS
ensures a minimum reporting frequency. One way to see this parameter, is
that this time will be the report period when the vehicle is stationary.
The Minimum time between reports takes control of the report when the
unit exceeds the Distance threshold . Assuring that even when the unit is
exceeding the Distance threshold it will not report too frequently, no more
frequent than the configured minimum time value. One way of seeing this
parameter is that this time will be the report period when the vehicle is
moving too fast.
A
Time and Distance signal is configured with the following parameters:
1. Distance Threshold.
2. Minimum time between reports.
3. Maximum time between reports.
A T&D signal (
TD
) gets high according to its defined T&D parameters and
it is immediately reset after all events have been evaluated in order to get
ready for the activation of the signal again, when the T&D criteria is met
on the future.
To create a tracking event that sends event code 49 based on a T&D cri-
Example
terion. A 8km ( 5miles )report is desired. The criterion must be so that no
more than one hour passes between successive reports, and the minimum
time between successive reports must be 2 minutes.
To do so we choose for no particular reason the T&D criterion
6
. The
requirements call for the following T&D configuration:
•
Minimum time between reports: 120 seconds (2mins).
• Distance Threshold: 80 x 100m (8km).
•
Maximum time between reports: 3600 seconds (1hr).
This configuration is achieved by sending:
>
STD60120000000803600
<
Now we create event 49 using the
TD6
signal:
>
SED49NV0;TD6+
<
The T$D could also be configured on a time-only basis by defining the
Minimum Time parameter and setting the others to zero. To define a time-
only criteria of 15 minutes (900 seconds):
>
STD60900000000000000
<
or:
>
STD60900
<
4.9 Using Time Windows
Refer to the
GT
message.
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