GM862-GPS Software User Guide - SemiconductorStore.com

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GM862-GPS Software User Guide1vv0300729 Rev. 4 - 24/01/075.4.6 VTG - Course Over Ground and Ground SpeedThis sentence reports the actual course and speed relative to the ground.Table I contains the values for the following example:$GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*23Table I: VTG Data FormatName Example Units DescriptionMessage ID $GPVTG VTG protocol headerCourse 309.62 Measured headingReference T TrueCourse degrees Measured headingReference M MagneticSpeed 0.13 knots Measured horizontal speedUnits N KnotsSpeed 0.2 km/hr Measured horizontal speedUnits K Kilometers per hourMode A A=Autonomous, D=DGPS, E=DRChecksum *23 End of message terminationNOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data aregeodetic WGS84 directions.Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 102 of 111
GM862-GPS Software User Guide1vv0300729 Rev. 4 - 24/01/075.5 Checking GPS device functionalityAfter a proper power on the device is ready to receive AT commands on the MODEM serial port.The GPS receiver also will be automatically powered on and it will start the scan of the available GPSsignals.On the NMEA serial port (default 4800 bps, 8, n, 1) there must be presence of the NMEA sentences.5.6 CONTROLLING GPS RECEIVERThe GM862-GPS module is provided by a set of AT commands that permits to configure and use itthrough the MODEM serial port.For the full list of available commands please refer to the GM862-GPS AT Commands ReferenceGuide.5.6.1 POWER CONTROL OF GPS RECEIVERThe GPS receiver is by default switched on at the first power On.If is necessary to switch it off or On is possible to use the AT$GPSP command.The GPS part is supplied by the VAUX1 signal provided by the GSM part. The GPS receiver is usableif the GSM module is switched on (or at least in power saving).This command also switch off the GPS antenna supply.Syntax of the command :AT$GPSP=Where means :0 GPS controller is powered down1 GPS controller is powered up (default)? Returns the range of values acceptedAT$GPSP? will return the current status.Example 1 : (to switch off the GPS)AT$GPSP=0OKExample 2 : (to know the status)AT$GPSP?The answer will be:$GPSP: 0Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 103 of 111
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