PWRKEY pin.Thepower managementASICdisconnectsthepower
supplyfromthebasebandpartofthemodule, andonlythepower supply
fortheRTCisremained.Softwareisnotactive. Theserialinterfacesare
notaccessible. Operating voltage(connectedtoVBAT)remainsapplied.
functionalitymodewithoutremoving thepower supply.Inthiscase, the
RFpartofthemodulewill notworkortheSIMcardwill notbeaccessible,
orbothRF partandSIMcardwill beclosedall,buttheserialportis still
accessible. Thepowerconsumptioninthiscaseisverylow.
Note:Themoduleis settoautobaudratemode(AT+IPR=0)in default configuration.Intheauto
baudratemode,theURC “RDY”afterpoweringonisnotsenttohostcontroller.ATcommand
canbesenttothemodule2-3seconds afterthemoduleis poweredon.Hostcontrollershould
firstly sendan “AT”or “at”string in orderthatthemodulecandetectbaud rateofhost controller,
andit shouldsend thesecondorthethird “AT”or “at”stringuntilreceiving “OK”stringfrom
module.Ifyouneedtousingfixedbaud rate, Thenan “AT+IPR=x;&W”shouldbesentto
moduleand savetheconfigurationtoflashmemoryofmodule.After theseconfigurations,the
URC “RDY”wouldbereceivedfromtheSerialPortofmoduleeverytimewhenthemoduleis
poweredon. Refer toChapter “AT+IPR”inARcommandmanual.
3.3LEDindication
3.3.1RedLedisthepower indication.
3.3.2YellowLedistheRINGindication.
3.3.3GreenLedis theWorkingstateindication.
TheWorking stateofthisLED islistinthetable6.
Table6Workingstateindication
