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Raven EDGE
60 20070914
TheRTUconnectstophysicalequipmentsuchasswitches,
pumps,andotherdevicesandmonitorsandcontrolsthese
devices.TheRTUcanbepartofanetworksetupforSuper
‐
visoryControlandDataAcquisition.
Supervisory Control and Data Acquisition (SCADA)
SupervisoryControlandDataAcquisition(SCADA)describes
solutionsacrossalargevarietyofindustriesandisusedin
industrialandengineeringapplicationstomonitorandcontrol
distributedsystemsfromamasterlocation.SCADAencom
‐
passesmultipleRTUs,acentralcontrolroomwithahost
computer(ornetwork),andsomesortofcommunicationinfra
‐
structure.
SCADAallowsfor“supervisory”controlofremotedevicesas
wellasacquiringdatafromtheremotelocations.Program
‐
mableLogicControllersallowforahigherdegreeof
automatedSCADA.
Programmable Logic Controller (PLC)
AProgrammableLogicController(PLC)isasmallindustrial
computerwhichgenerallymonitorsseveralconnectedsensor
inputsandcontrolsattacheddevices(motorstarters,solenoids,
pilotlights/displays,speeddrives,valves,etc.)accordingtoa
user‐createdprogramstoredinitsmemory.Containinginputs
andoutputssimilartoanRTU,PLCsarefrequently
usedfor
typicalrelaycontrol,sophisticatedmotioncontrol,process
control,DistributedControlSystemandcomplexnetworking.
Modbus TCP/IP
ModbusTCP/IPsimplytakestheModbusinstructionsetand
wrapsTCP/IParoundit.SinceTCP/IPisthecommunications
standardfortheInternetandmostnetworkedcomputers,this
providesasimplerinstallation.ModbusTCP/IPusesstandard
Ethernetequipment.
Raven Modbus on UDP
WhenSierraWirelessAirLinkmodemsareusedinplaceof
radios,aRavenisconnectedtothecentralstation(host)and
aRavenisconnectedtoeachremoteunit.WhentheRavenis
configuredforModbuswithUDP,theRavenconnectedtothe
hostcanstorealistofIPaddressesor
nameswithmatching
IDs.Whenthehostatthecentralstationsendsserialdataasa
pollrequest,theRavenatthehostmatchestheRTUIDtoa
correspondingIPofaRavenataremoteunit.AUDPpacketis
assembledencapsulatingtheRTUIDandserialdata
trans‐
mittedfromthehost.TheUDPpacketisthentransmittedto
thespecificRavenattheremoteunitmatchingtheRTUID.