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4.12. MANIPULATING SIGNALS
ation occurs. An example of such configuration can be found on the
Scenarios and Examples sections. With the same method, counters
can be used to count the number of occurrences of an event.
For detailed information and more examples see the
GC
message. For
more examples on using counters, see the Scenarios and Examples
sections.
4.12 Manipulating signals
Signals marked with a (-) sign on the signals’ list on the Event Ma-
chine section can be directly manipulated by the user. These signals
are the User Signals (10): Signals’ manipulation and consulting is
achieved with the
SS
TAIP message.
4.12.1 User signals
User signals (U) are used to create complex configurations. User
signals are set or reset only with the
SS
message. Thus, they are
used to trigger events based on a user set/reset
SS
command or on a
set/reset
SS
event user-action. Refer to the Scenarios and Examples
section for more information.
4.13 Using Heading Deltas (turn-by-turn report)
By using Heading Deltas , a turn-by-turn reporting criteria can be cre-
ated. This is achieved by making the unit report only when the vehi-
cle’s heading changes significantly since the previous heading-change
report. To do so, the
J signals are used. A J signal is automati-
cally set high whenever the unit’s GPS heading (traveling direction)
changes by more than the delta value defined with a
XAGH
message.
After being evaluated, the signal is set to low to enable further trig-
gers. Also, the heading value used for comparing the actual heading
of the unit is updated so a new heading change can be detected.
Heading-change detection is only done when the traveling speed
is greater than 5mph.
Note:
A turn-by-turn report, having a delta value of 45 degrees, looks like:
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