User's Manual

TALONCV002UserManual
6
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Two GPIO pins, GP1 and  GP2, are presented to the external environment on the main
connector. They are general purpose bidirectional lines capable of providing system
interruptstogenerateareportordrivelogiclevelstoexternalde vices.Theselinesare2.8V
logiclevelandare15Vtolerant.Thesepinsdefault
toinput.GP1ispulleddownrepresenting
0 when disconnected; GP2 is pulled up representing logical  1 when disconnected. They
shouldbeassertedtoaknownvalueifused.GP1isintendedtouseforIgnitionSensing.
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LED’s 
Two LED status indicators are provided to verify correct installation and operation. The
statusLEDsarecolorcodedanddirectlyconveythestatusoftheCDMAandGPSsubsystems 
as describedinthe table below. Their valid operationalso indicates operational status and
power.
LED Function Status
Red GPS On:GPSsatellitesacquiredand
Locked 
FlashSlow:GPSsatellitesearchis
inprogress
Off:NopowerorGPSsubsystem
fault 
Green CDMA/CDMAConnection On:IndicatesCDMAconnectionis
made 
FlashSlow:CDMAsubsystem
initializedbutnoconnection
FlashFast:CDMAinitializationin
process
Off:NopowerorCDMA
subsystemfault 
The ION provides user control allowing the LEDs to be extinguished once installation is
verified. This feature reduces power and further conceals the ION Tracker from untrained
partieswishingtodefeatitsoperation.
UART 
AUARTportisprovidedforATcommandanddatainteractionand optionallyforapplication
specificcontr ol.Whenin powerdown mode,acharacter mustbesent totheUARTfirstto
wakeitup.Theportwillstayawakefor5secondsafteranycharacterreceived.
RelayDriver 
A500mAsinkcapableoutputpinisprovided.Thispinismeanttodrivearelaycoilindented
tointerruptthestartersolenoidrelayfortheignitioncircuittoacar.
BatteryMonitor 
ThebatterymonitorisinternalanaloginputscaledsuchthattheDCvalueofthepowerinput
pintotheIONsystemismeasured.Thisvalueisscaledtospanthemostsignificant8bitsof
theA/Dandconsequentlycoversascalefrom0to25.5Volts.
Timers 
Timers resident on the CDMA baseband chip generate periodic interrupts for power down
wakeup, watchdog support, report generation and other timer related functions. Report
timersaresupportedbyrelatedATcommandandcausegenerationofperiodicreports.