rev1 ā Dec 2013 www.digitalcomtech.com 41
TD - Time and Distance
Qualifiers: Q, S, R.
The Time and Distance signals are set by its corresponding Time and Distance
counter which is a counter that follows a Time and Distance criteria. This criterion
allows creating a counter that does not follow a time or distance criteria
independently from each other, instead, combines these two variables to generate an
intelligent trigger to be used for a more efficient vehicle tracking. The message has
the following format:
ABBBB[CCCCDDDDEEEE]
o A: Index. Range 0-9. Specifies one of the Time and Distance configurations
associated with a Time and Distance signal TDA.
o BBBB: Minimum amount of time elapsing between reports. To enable just time
reporting, this is the only parameter to set, and the others should be set to 0.
Setting this value to 0 disables the report.
o CCCC: This parameter is ignored and can have any value.
o DDDD: Distance the unit must travel between reports. Each unit represents 100
meters.
o EEEE: Maximum amount of time elapsing between signals' activation. This
parameter is only relevant when distance reporting is desired. If set to 0, there is
no limit to the amount of time between reports.
Examples:
In this example we will create a tracking event that sends event code 49 based on a
T&D criterion. 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.
In this example the T&D index 6 is used for no particular reason. The requirements
call for the following T&D configuration:
o Minimum time between reports: 120 seconds (2mins).
o Distance Threshold: 80 x 100m (8km).
o 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+<
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