Installation manual
SimradPI50
Table1Defaultcommunicationchannelsandupdaterates(cont’d.)
SensorCom.channel(s)
Updaterate
PITemperature
8
Normal
PIGeometry
Standard:1and3
Extendedrange(XT):1and3
Differential(DF):1
Normal
Normal
Normal
Changingacommunicationchannel
Itmayberequiredtochangeoneormorecommunicationchannels,andtheremaybe
manyreasonsforthis.
•Youhavemorethanoneofeachsensor.Forexample,ifyouhavethreetemperature
sensors,theyMUSTcommunicateonthreedifferentchannels.
•OthervesselsnearyourusethesamePIcatchmonitoringsystem(orasimilar),and
theyhaveoneormoreoftheirsensorssetuptothesamecommunicationchannelsas
youhave.Thiswillcreateinterference,asyouwill"read"eachotherssensors.
•Ifyoursensorsaresetuptousecommunicationchannelstooclosetoeachother(for
example,youhavechosenchannels4,5and6),thiswilllimitthevesselspeed.The
reasonforthisistheDopplereffect.Ifthespeedistoohigh,theDopplerwillcause
thetransmissionfrequenciestochangesomuchthattheyoverlap,andthiswillcreate
interference.ThePIsystemwillprovideawarningifthisisabouttohappen!You
musttheneitherchangetoothercommunicationchannelsfurtherapart,orreduce
themaximumshootingspeed.
•Ifyouoperateatthemaximumrangeofthesensors,youmaybeabletoincreasethis
rangeslightlyifyouuselowercommunicationchannels.Thisisbecausethelower
communicationchannelsuselowertransmissionfrequencies.
AllsensorsareprovidedfromSimradwithadefaultcommunicationchannel.Insome
casesyoumayndthatthechosenchanneldoesnotsuityouroperationalneeds,for
exampleifyouhavemorethanonesensorofanygiventype.Thisisadecisionyou
havetomakedependingonhowmanysensorsyouuse,andhowmanyofthesethat
areidentical.
→Defaultcommunicationchannelsandupdateratesonpage89
Changingtheupdaterate
Itmayberequiredtochangetheupdaterateonasensor,thatishowoftenitsends
informationbacktothePIcatchmonitoringsystem.Ahighupdateratewillgive
frequentinformationupdates,butthesensorwillusemorebatterypower.Ifyouneed
yourbatteriestolastaslongaspossible,youmustconsiderloweringtheupdaterate.
•Alowupdateratewillprovideyouwithfewerinformationupdates,butthebattery
willlastverylong.
•Ahighupdateratewillgiveyoufrequentinformationupdates,butthebatterywill
runoutfaster.
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