Siera Wireless MP555, Software Installation Manual

Page: 59 / 74

Using the Monitoring and Tracking Protocol
Rev 1.2 57
beginning with
to .
MT_SUM_REG_IND
message. )
Jan.05
MT_CREQ_GPS_INIT
) for that purpose. TAIP
commands in those strings are executed in sequence from
MT_CREQ_GPS_INIT1 MT_CREQ_GPS_INIT5
Alarm acknowledgement
Note: When the fast rate timer is
set to 0, a single report is sent
when an I/O alarm is triggered. It
is not necessary to acknowledge
the alarm.
As stated above, when a digital input alarm occurs, the
MP 555 GPS starts sending the
message at
the interval designated by the fast rate timer. The faster rate is
used until the host application acknowledges the alarm by
sending the
MT_ALM_RST_IND
message. Even if the alarm goes
off, the modem persists in sending
MT_SUM_REG_IND
with the
alarm set on, until the acknowledgement is received. (That is,
the alarm is “latched and active” until it is reset by the host
application with the
MT_ALM_RST_IND
The alarm becomes “idle” on receipt of the
MT_ALM_RST_IND
acknowledgement. The MP 555 GPS then resumes sending
MT_SUM_REG_IND
at its regular rate.