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Siretta Ltd
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Reading
Berkshire RG7 1PW
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ZETA-NLP Series
LTE Cat M1/NB IoT/GSM Ultra Low Power Modem
ZETA-NLP Power Enhancements
TheZETA-NLPhasbeendesignedtooperateinanultralowpowerstateasstandard.Therehavebeenanum
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berofenhancementsmadetothefunctionaloperationoftheunittohelpaccommodatelowpoweroperationin
normaluse.Whenrunninginfullpowermodetheunitmakesuseofaveryefficientpowersupplyandallcom
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ponentshavebeenoptimizedforreducedcurrentlossacrosstheentiredesign.
ZETA-NLP Low Power Mode
TheZETA-NLPhasaspecialmodeofoperationwhichforcestheunittodropdowntoasuperlowpowerstate
wherethemodemisstilloperationalandregisteredonthenetworkbutisfunctionallyasleep.Thisallowsfor
themodemtoremainconnectedtothenetworkandbereadytosendandreceivedatausingafractionofthe
energy.
ThissuperlowpowerstateisachievedbysettingthefollowingATcommandtothemodem:
AT+CFUN=5
Oncethiscommandhasbeenissuedthenthemodemisreadytoenterlowpowermode.Toactivatelowpower
modeandputthemodemintoadormantstatetheDTRlinebustbedeassertedontheserialport.
WhenthedevicehasenteredlowpowermodetheCTSlinewillde-assertindicatingthatthedevicehasgone
intolowpowerstate.AtthispointtheserialportisalsodeactivatedandthemodemwillnotrespondtoATcom
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mandsandwillappeartobeoff.Tobringthemodembacktonormalpowerstateandcommunicatewiththe
modemagainitisnecessarytore-asserttheDTRlineandthemodemwillleaveitsdormantstateandbecome
fullyactivefornormaloperation.Wheninthedormantlowpowerstateanincomingcallrequest,incomingSMS
orincomingsocketrequestwillforcethemodemtoenteritsfullpowermodeandbeabletobeusedasnormal.
Thismodeallowsthemodemtoconsumeverylittlecurrentwhilstitisnotinusebutbeavailableforuselocally
byassertingtheDTRlineorexternallyfromanincomingcommunicationrequest.Themodempoweronand
powerlineswillremainactivethroughoutandcanalsobeusedtoturnthemodemcompletelyoff.