User's Manual

DRAFT TrimTrac 1.5 Technical Manual v0.3ab 73
Initiation of a High Priority Alert will cause the TrimTrac 1.5 to terminate immediately
whatever state it happens to be in at the time and to commence continuous transmission
of the alert message until a SET_ALERT_STATE message acknowledging or clearing
the activated High Priority Alert is received by the TrimTrac 1.5.
Please see Table 17, High Priority Alert Processing on page 75. Also, Figure 5, HPA
Processing in TRANSMIT, on page 63 has a detailed flow chart on how High Priority
Alerts are processed in the TRANSMIT state.
Medium Priority Alert Processing
Activation of a Medium Priority Alert will allow the TrimTrac 1.5 to complete some of
its current operations before beginning to transmit a Medium Priority Alert message. For
instance, if the device happens to be in either the FIX or TRANSMIT states, it will
attempt to complete those tasks, within certain time limits, before transitioning back into
the TRANSMIT state to begin sending the Medium Priority Alert. Then, once sent, the
device will go collect new position information while waiting for an acknowledgement
from the server application. This is different than a High Priority Alert that would
continuously re-transmit the alert message without computing a new position fix.
An example of a Medium Priority Alert could be a relay interconnected with an on-board
security system. The relay would be activated, for instance, when the security system is
in a state of “alarm” (i.e. annuciators operating).
Please see Table 18, Medium Priority Alert Processing on page 76. Also, Figure 6, MPA
Processing in TRANSMIT, on page 64 has a detailed flow chart on how Medium Priority
Alerts are processed in the TRANSMIT state.
Low Priority Alert Processing
Provided the Low Priority Input is not configured as either a geofence or runtime meter
activation input, a Low Priority Alert is processed much the same as a Medium Priority
Alert with the exception that there must also be motion before a Low Priority Alert is
initiated. For instance, closing the Low Priority Alert switch shown in Figure 9, Vehicle
Adapter Module Alert Wiring Diagram will not in and by itself cause the Low Priority
Alert to be initiated. Opening the Low Priority Alert switch must also be accompanied
by motion before becoming “activated.” An application example would be interlocking a
relay with the on-board security system such that when the security system is “armed”,
the relay is also activated. Any subsequent motion until the security system is turned-off
by the owner would be “unauthorized”. The TrimTrac 1.5 would sense this motion and
commence transmitting an alert message until acknowledged or cleared by the server
application.