Sensys Networks MAG2 MAG2/GR Sensor User Manual VSN240 F GR Sensor Data Sheet

Sensys Networks, Inc. MAG2/GR Sensor VSN240 F GR Sensor Data Sheet

User manual

1608 4th Street Suite 200 Berkeley CA 94710| info@sensysnetworks.com | P 510.548.4620 F 510.548.8264
1608 4th Street Suite 200 Berkeley CA 94710 | info@sensysnetworks.com| P 510.548.4620 F 510.548.8264
Functions / Features
Lower power consumption
3-axis magnetometer for vehicle detection
• 128Hzsamplingrate
• Countandpresencedetectionmodes
• Modesforbicycleandmotorcycledetection
Flush mount or up to 7" depth in-pavement
installation with no wires or lead-in cabling
Fast and simple installation
• Installsinlessthan10minutesinsmall
holeusingahammerorcoredrill
–4”(10cm)diameter;amaximumof7”(17.8cm)
deep
–Coveredwithfast-dryingepoxy
• Minimallaneclosuretime
• Nosawcuts
Expected 10 year battery life
• Ruggedmechanicaldesign
• Auto-calibration
Reliable 2-way radio communications with access
point
• Uniquelyaddressableandcongurable
• Firmwarecanbeupgradedover-the-air
Readily deployed where other systems cannot be
used
• Splitroadways
• Highwatertables
• Damagedpavement
MAG2/Grind Resistant (GR) Sensor
The Sensys Networks VDS240 Wireless Vehicle Detection
System useswirelessmagneto-resistivesensorstodetectthe
presenceandmovementofvehicles.Thesensors–installedinholes
coredintheroadwayandcoveredwithepoxy–transmitdetection
datainreal-timevialow-powerradiotechnologytoanearbySensys
Networksaccesspoint.Vehicledetectionsarefurtherrelayedtoa
trafcsignalcontroller,remotetrafcmanagementcenter,orother
system.
The new MAG2/GR sensordevelopedbySensysNetworksutilizes
thenextgenerationofRFchipsetsandcircuitry.TheMAG2sensors
areinstalledushwiththeroadwaysurfaceinplasticshells.The
plasticshellsenabletheremovalandreplacementofsensorsduring
roadwaymillingoperations.TheGRsensorsareinstalledatdepth
ofupto7inchesbelowthetopoftheroadwaysurfacewithout
plasticshells.Sensorsinstalledatthesedepthsdonothavetobe
removedandreplacedduringmostroadwaymillingoperations.
Intypicaltrafcmanagementapplications,asensorisplacedin
themiddleofatrafclanetodetectthepresenceandpassageof
vehicles.Vehiclespeedsandlengtharemeasuredbytwosensors
installedinthesamelanewiththeexactdistancebetweenthem
conguredinsoftware.Therecommendeddistancebetween
sensorsdependsontherangeofexpectedspeedstobemeasured:
fortypicalfreewayapplications,aseparationof20to24feet(6.1
to7.3meters)isrecommended;fortypicalarterialapplications,a
separationof10to12feet(3.1to3.7meters)ispreferred.
Advanced Magnetometer-Based Vehicle Detection.
Thestate-of-the-artmagneto-resistivesensingdevicesineach
wirelesssensormeasurethex-,y-,andz-axiscomponentsofthe
Earth’smagneticeldata128Hzsamplingrate.Asvehiclescome
withinrange,changesinthex,y,orzaxesofthemeasured
magneticeldbecomeapparent.Whennovehiclesarepresent,
sensorscontinuallymeasurethebackgroundmagneticeldto
estimateareference.Eachsensorautomaticallyself-calibratesto
thelocalenvironment,andtoanylong-termvariationsofthelocal
magneticeld,byallowingthisreferencevaluetochangeovertime.
Types of MAG2/GR Sensors:
VSN240-F-2
• Flush-mountwirelesssensorforin-pavementinstallation
• For allfreeway,arterial,andsignalcontrolapplications
VSN240-T-2
• Flush-mountwirelesssensorforin-pavementinstallation
• For signalcontrolapplicationsonly
VSN240-F-GR
• Forupto7"depthin-pavementinstallation
• For allfreeway,arterial,andsignalcontrolapplications
VSN240-T-GR
• Forupto7"depthin-pavementinstallation
• For signalcontrolapplicationsonly
Sensys Networks and the Sensys Networks logo are trademarks of Sensys Networks, Inc. All other trademarks are the property of their respective owners.
Information contained herein is believed to be reliable, but Sensys Networks makes no warranties as to its accuracy or completeness.
Copyright © 2014 Sensys Networks, Inc. • ALL RIGHTS RESERVED • P/N 153-240-100-008 Rev C
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MAG2/GR Sensor
Functional Specications
detection technique 3-axismagneticeldsensing
sampling rate 128Hz
programmable
vehicle detection
parameters (mode
B only)
• Z-axisdetectthreshold(mG)
• Z-axisundetectthreshold(mG)
• X-axisundetectthreshold(mG)
• onsetlter(ms)
• holdover(ms)
• auto-recalibrationtimeout(secs)
over-the-air
protocol
SensysNetworksNanoPower(SNP)
protocol(TDMA)
physical layer
protocol EEE802.15.4PHY
modulation
DirectSequenceSpreadSpectrumOffset
QuadraturePhase-ShiftKeying(DSSS
O-QPSK)
transmit/receive bit
rate 250kbps
frequency band 2405to2480MHz
(ISMunlicensedband)
frequency channels 16
channel bandwidth 2MHz
antenna type
microstrippatchantenna
(mountedbelowtopsurfaceof
sensor)
antenna eld of
view ±60°(azimuth&elevation)
nominal output
power +3dBm
spurious emissions
• 30-1000MHz:<-36dBm
• 1-12.75GHz:<-30dBm
• 1.8-1.9GHz:<-44dBm
• 5.15-5.3GHz:<-47dBm
typical receive
sensitivity -101dBm(PER=1%)
saturation (max
input level) ≥10dBm
Sensor Modes
mode application description
B (event)
countstations;
advancedetection
• sendstimestampedON
andOFFdetectionevents
usingcongurabledetection
parameters
• notsupportedbyVSN240-T
E (idle) statusreporting
disablesmagnetometerandsends
sensorhardwareandsoftware
versioninformation
STOPBAR-#
(presence
detection)
stopbardetection;
rampmanagement
sendstimestampedONandOFF
detectioneventsusing
pre-congureddetection
parameters
•16differentstopbardetectionmodescanbeselected
•recommendedstopbardetectionmodesforspecic
applications:
STOPBAR-0 bicycles/scooters
STOPBAR-2 motorcycles
STOPBAR-5 passengervehicles
(normalrecalibration)
STOPBAR-7 passengervehicles
(fastrecalibration)
STOPBAR-14 lightrail
Power, Physical, & Environment
power supply
• non-replaceableprimaryLi-SOCl23.6vbattery
pack
• 8.5Ah(nominalcapacity)
dimensions 2.9”x2.9”x2.2”(7.4cmx7.4cmx5.6cm)
weight 0.47lbs/0.213kg(withoutshell)
environmental
• designedforin-pavementmounting
• NEMAType6Penclosure
• IP68ingressprotection
operating temp -40ºFto176ºF/-40ºCto+85ºC
Compliance
safety 2006/95/EC
EMC
• FCC:ThisdevicecomplieswithPart15oftheFCCrules.Operationissubjecttothefollowingtwoconditions:(1)
Thisdevicemaynotcauseharmfulinterference,and(2)thisdevicemustacceptanyinterferencereceived,including
interferencethatmaycauseundesiredoperation.Changesormodicationsnotexpresslyapprovedbytheparty
responsibleforcompliancecouldvoidtheuser’sauthoritytooperatetheequipment.
• CE0678
• 2004/108/EC

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