User Manual

The HE910V2 module is provided by a set of AT commands that permits to configure and
use it through the MODEM serial port.
The GPS receiver is by default switched off at the first power on. If is necessary to switch it
on or off is possible to use the AT$GPSP command. The GPS receiver is usable if the GSM
module is switched on (or at least in power saving). This command also switches off the GPS
antenna supply.
Syntax of the command AT$GPSP=<status>
Where:
<status> - 0 GPS controller is powered down(default), 1 GPS controller is powered up, ?
Returns the range of values accepted
AT$GPSP? will return the current status.
Example 1: (to switch on the GPS)
AT$GPSP=1<CR>
OK
Example 2 : (to know the status)
AT$GPSP?<CR>
The answer will be:
$GPSP: 0
OK
With the command AT$GPSR=<reset type> is possible to reset the GPS module.
Parameter:
<reset type>
0 - Factory reset: This option clears all GPS memory including clock drift. It is available in
controlled mode only.
1 - Coldstart (No Almanac, No Ephemeris): this option clears all data that is currently stored in the
internal memory of the GPS receiver including position, almanac, ephemeris, and time. The stored
clock drift however, is retained. It is available in controlled mode only.
2 - Warmstart (No ephemeris): this option clears all initialization data in the GPS receiver and
subsequently reloads the data that is currently displayed in the Receiver Initialization Setup screen. The
almanac is retained but the ephemeris is cleared. It is available in controlled mode only.
3 - Hotstart (with stored Almanac and Ephemeris): the GPS receiver restarts by using the values
stored in the internal memory of the GPS receiver; validated ephemeris and almanac. It is available in
controlled mode only.