Specifications

GT300 @Track Air Interface Protocol
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4.3. Fixed Timing Report
4.3.1. Basic Setting
“Fixed timing report” is a basic function of the @Track Protocol. The backend server can
configure the <start time> and <end time> to schedule periodical position reports. In the
pre-defined period of time, the terminal will start up GPS every <fix interval> time and report the
recorded position log to the backend server every <send interval> time.
Example:
The following is an example of “fixed timing report”:
AT+GTTRI=gt300,1000,2300,5,60,1,20,500,3,0002
<start time> = 1000
<end time> = 2300
<send interval> = 5
<fix interval> = 60
¾ Fix and send interval
The terminal has two modes to operate the GPS module according to the value of <fix interval>:
— “Normal mode”: If the <fix interval> is more than 60 seconds, the terminal will close the
GPS part every time after GPS fixing finishes in order to save power.
— “Emergency mode”: If the <fix interval> is less than 60 seconds, the terminal will never close
the GPS part. In this mode, the <send interval> will be ignored, the terminal reports every
<fix interval> time, and the minimum value of <fix interval> is forced to 30 seconds.
Due to the maximum length limitation of the report message, it must be assured that: <send
interval> / <fix Interval> <= 15. If exceed that limitation, the command is discarded and the
previous settings keep untouched.
If the terminal is in “Force on SMS Mode” (<report mode> = 4) while the <send interval> / <fix
Interval> > 1, the terminal will report only the last position in the fixed timing report, because
only one position could be filled in one single SMS message (160 bytes at most).
If either <send interval> or <fix Interval> is 0, the fixed timing report will be disabled.
¾ Action time range
— <begin time> < <end time>: reports in the time period (begin time, end time) every day.
— <begin time> > <end time>: reports starting from “Begin time” and stopping at “End time”
on the following day.
— <begin time> = <end time>: reports on the whole day.