Earphone&Microphone
Externalpowersupplyviathepowerjack
NOTE:Itisrecommendedyoutosupply712V@1Apowerviathepowerjack.Whenusing
theGSMmode,themodulerequiresanexternalpower.Butthepowerconsumptionisnot
high,just200mA@7v,whencalling.
HowtodrivetheGSMModeviaUSBport
1.Ifyourmoduleisenabled,theindicatorstatLEDwilllightup,thismeansthatthemoduleis
runningcorrectly.TheLEDmarked"NET"willbelitwhennetworkcommunicationhas
beingestablished.
2.SendtheATcommandstothemodulebyusingCoolterm(http://freeware.the
meiers.org/CoolTermWin.zip)(orusetheArduinoserialmonitor).
NOTE:IfyouwanttoprogramtheArduino,pleasedisconnectthecooltermtoreleasethe
communicationport.
GSMmode&GPSmodeSelection
ExceptusingUARTselectionjumpercaps(oldversion)orswitch(latestversion),youcouldswitch
GSMandGPSfunctionwiththeIOpinsalso.TheUARTselectionislocatedonthebottomright
nearthePWRSTATandNETLEDs.RemovethejumpercapsconnectedforhardwareUART
selection(oldversion)orsettheswitchinmiddleposition(latestversion)inordertocontrolthe
GSM/GPSbysoftware.
EnableGPSmode&disableGSMmode:
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1
2
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EnableGSMmode&disableGPSmode:
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1
2
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NOTE:YoucouldcontrolGPSthroughtheGSMATcommands,withoutrequiringtoenable
bothindependently.ThiswayyoucanlettheGPSenabledwhileusingGSMnetwork.Thusnot
triggeringaGPSreset.
Networkindication
State SIM908behavior
Off SIM908isnotrunning
64msOn/800msOff SIM908notregisteredthenetwork
64msOn/3,000msOff SIM908registeredtothenetwork
64msOn/300msOff PPSGPRScommunicationisestablished
NOTE:Followingthestepsincludedinthesketchbelowfirst!