Sierra Wireless 20070914 - page 66

PinPoint X HSDPA
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Digital Inputs
Figure 7-2: Digital Input Contact Closure
Bymeasuringcontactclosuresonswitches,thedigitalinputs
canreportasimpleopenorclosedstate.Eachofthefour
digitalinputscanbewiredtothetwogroundsignalsviaa
switch.Whentheswitchisopen,theinputwillread“OPEN”.
Whentheswitchisclosedandtheinputisconnectedto
ground,theinputwillread“CLOSED”.
•Whenadoororotherlatchisopenedorclosed.
•Countingpulsesorotherelectronicevents.
•Whenagaugereachesacertainpoint.
•Whenacontainerfillsorempties.
•Whenaswitchorvalveisopenedorclosed.
•Whenthetowbarisraisedorlowered.
•Connectedtoasensor,theleveloffuelinavehicle.
•Whenthetrunkofavehicleisopenedorclosed.
•Whentheignitionisturnedonoroff.
Relay Outputs
Asanelectronicswitchwhichcanbeopenedorclosed
(NormallyOpenrelay),arelaycanbeusedtotransmitan
actiontoanotherdevicebysignallingtothatotherdevicean
“on”or“off”.AsaNormallyOpenrelay,thecircuitofthe
relayisdisconnected(open)unlessitisactive.Whentherelay
isactive,thecircuitisconnected(closed).
•Settingoffanalarmorsiren.
•Trig ger ing aprocesstostartonanotherdevice.
•Openingorclosingavalveorswitch.
•Lockingorunlockingadoor.
•Turn ing alightonoroff.
•Openingthevehicle’strunkordoors.