User Guide

Global Positioning System (GPS)
Rev 3.0B Feb.08 92
IfthePinPointXdoesn’treceiveacknowledgementfora
“window”,themodemwillPINGtheserverwithamessage
containingthesequencenumbersofthefirstandlastpackets
thathaven’tbeenacknowledged.ThePinPointXwillcontinue
untiltheserveracknowledgesreceipt.WhenthePinPointX
receivestheacknowledgement,it
willadvanceits“window”to
thenextgroup.
WhenthePinPointXisfirstpoweredon(orreset),itwillsend
aSetWindowmessagetosyncupwiththeserverforthe
current“window”.
Ontheotherside,iftheserverreceivesanoutofsequence
packet,itwillsendamessagetothemodemnotingthemissing
sequenceandthePinPointXwillretransmit.
Figure 10-11: AceManager : PinPoint - *PPSNFR, *PPMAXRETRIES
SimpleReliableModewill‘giveup’afteraconfigured
number,*PPMAXRETRIES,ofattemptsanddiscardmessages
thatcannotbetransmittedorreceivedafterthatnumberof
tries.
Sending Reports Based on an Interval
YoucanconfigurethePinPointXtosendreportsbasedona
timeintervaland/oronthemovementofavehicle(basedon
it’spositionfromonetimetothenext).
Figure 10-12: AceManager : *PPTIME, *PPDIST, *PPTSV, *PPMINTIME
• *PPTIME‐Locationreportsenteverysettimeinterval
(seconds).
• *PPDIST‐Locationreportsentonlyifthepositionismore
thanthesetdistance(x100meters)
• *PPTSV‐Locationreportsentifthevehiclehasbeenin
onelocation(stationary)formorethanasettimeinterval
(minutes).
• *PPMINTIME‐Locationreportsentatnolessthanthis
timeinterval(seconds).