rev1 ā Dec 2013 www.digitalcomtech.com 15
it triggers a TD signal on a time-only basis set by the Minimum Time Between Reports
parameter. Please refer to the TD message for more information.
Let's use a reporting period of 5 minutes (300 seconds). For no special reason let's choose
TD signal 8 to do the job:
>STD80300<
This will make the unit activate signal TD8 every 5 minutes so we can create an event
triggered by this signal which is going to generate the periodic report. Note that in order to
keep this example simple, we are using a basic time only report, but this approach is not
advised on a real world scenario where a vehicle remains at rest most of the time and
where having a time-only criterion will generate several unnecessary reports. It is
recommended to use the three parameters of the Time And Distance definition to achieve a
more intelligent report.
Tying a signal to an event
With the signal TD8 generating a pulse every 5 minutes the only thing left to do is defining
an event that triggers with this condition. At this point we need to ask ourselves what event
code to choose and what kind of message send to the AVL server. The answer lies on the
AVL server configuration: The event code has to have any meaning for the AVL software
and the type of message depends on the kind of information we will like to get from the
unit's report.
As event code we chose for no special reason, code 37:
>SED37NV4;TD8+<
Notice we are using DA 4. This will make the report generated by event 37 to be sent to the
single DP 00 which is our AVL server. For more information refer to the ED message.
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