GM862-GPS Software User Guide - SemiconductorStore.com

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GM862-GPS Software User Guide1vv0300729 Rev. 4 - 24/01/072.5 Checking GSM device functionalityAfter a proper power on the device is ready to receive AT commands on the serial port.Several things have to be checked in order to be sure that the device is ready to send and receivecalls and SMS:2.5.1 AutobaudingAt startup it is necessary to send an AT command to make the device set the right speed andcharacter format of the serial port. When this is done the device responds with OK. If no response isreceived within the timeout period of 200 ms retry.• Send command AT• wait for OK responseafter this initial command, it is advisable to fix the port rate, in order to eliminate possible errors indetecting the serial speed rate:• Send command AT+IPR=• wait for OK responsewhere rate is the port speed and can be 0, 300,1200,2400,4800,9600,19200,38400,57600,115200bps.If is set to 0, then automatic speed detection is enabled and also character format (see +ICF)is set to auto-detect. (default)If is specified and not 0, DTE-DCE speed is fixed at that speed, hence no speed auto-detection(autobauding) is enabled.TIP: The serial port suggested setting is: port speed 38400, character format 8N1 (8 bit perchar, No parity bit, 1 stop bit).Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 10 of 111
GM862-GPS Software User Guide1vv0300729 Rev. 4 - 24/01/072.5.2 SIM presence checkingAfter autobauding the first thing to check is the SIM presence and PIN code insertion, this can be donewith the following commands:2.5.2.1 Enable the Extended error result codes• send command AT+CMEE=1• wait for OK responseor if you prefer the verbose format instead of the numerical format then:• send command AT+CMEE=2• wait for OK response2.5.2.2 Query SIM presence and status• send command AT+CPIN?• wait for response:Response Reason Action+CPIN: SIM PINSIM is present and PIN is Proceed to par. 2.5.2.3required to continue operations+CPIN: SIM PUKSIM is present and 3 attemptsto give SIM PIN have failed, soSend commandAT+CPIN=SIM PUK is required+CPIN: READYSIM is present and no PIN code Proceed aheadis required to proceed+CME ERROR: 10 SIM not present Insert SIM or require SIMinsertion and repeat from par.2.5.2.2+CME ERROR: 13 SIM defect Check SIM insertion or requirea new SIM not defected andrepeat from par. 2.5.2.2+CME ERROR: 14 SIM is busy retry later+CME ERROR: 15 SIM is wrong type Check SIM, it must be a GSMSIM.Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 11 of 111
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5.6.4 GPS PARAMETERS SAVEGM862-GPS
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