IndustrialModemUserGuide
YML3913A 8
ModemFeatures
PowerDownFeature
S119canbesetwiththenumberofsecondsofnoactivitybeforethemodemshutsdown.Themodemwillnotshut
downifDTRisasserted,ifthemodemisconnected,anykeyonthekeyboardispressedoranalarmswitchison.
Themodemwillwakeupif:
· DTRisraised
· thereisaRingingsignalor
· analarmswitchisasserted.
S119defaultsto0(powerdowndisabled).
Themodemdrawsalmostnopowerwhenpowereddown.
DialandT alkF eature
Thisfeatureenablesamodemtoalert,byspokenword,thatanalarmsituationataremotesiteneedsattention.The
modemscanbeconfiguredtodialupto10presetnumbersandspeakastoredmessagewhenoneoftwoexternal
switchesareclosed.
Theseswitcheswillconnecttopins12and7(alarm1)andpins13and7(alarm2)oftheRS232connector. An
alarmconditionisrecognisedwhenashortcircuitisappliedacrosseitherpairofpins,egbyuseofarelay.
Bydefaulttomodemwillringstorednumber0ifeitheralarmswitchisclosed.
Tosetstorednumber0type:
AT&Z0=nnnnnnnnnnwherennnnnnnnisthephonenumber.
Youmaystoreupto10numbersusing&Z0to&Z9.
ThenumberstoringforeachalarmcanbespecifiedbytheAT#ALMcommand:
AT#ALM1=1,4,8,3
Meansthanifalarmswitch1ispressedthemodemshouldringthestorednumbers1then4then8then3.
AT#ALM2=9
Meansthatifalarmswitch2ispresseddialstorednumber9.