Sierra Wireless RAVEN 20070914 User Manual Page 77

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Rev 3.0B Feb.08 72
8
8: Configuring Modbus/BSAP
Configuring the Raven
at the Polling Host
for Modbus on UDP
Configuring the
Remote Ravens for
Modbus with UDP
TheRavensupportsModbusASCII,ModbusRTU,BSAP,and
canalsoemulateotherprotocolslikeDF1orothersusingits
ModbusVariablefeat ure.
Modbus Overview
TheModbusProtocol,developedbyModiconin1979,
providesforclientserver(alsoreferredtoasmasterslave)
communicationsbetweenintelligentdevices.Asadefacto
standard,itisthemostwidelyusednetworkprotocolinthe
industrialmanufacturingenvironmenttotransferdiscrete/
analogI/Oandregisterdatabetweencontroldevices.
Modbus,
BSAP,andotherModbu svariationsareoftenusedin
conjunctionwithtelemetrydevices.
Tip: This section is just a brief overview of Modbus. For more infor-
mation, refer to your Modbus equipment distributor or manufacturer or
http://www.modbus.org.
Te l e m e t r y
Telemetryisanautomatedcommunicationsprocessbywhich
dataiscollectedfrominstrumentslocatedatremoteorinacces
siblepointsandtransmittedtoreceivingequipmentfor
measurement,monitoring,display,andrecording.Trans
missionoftheinformationmaybeoverphysicalpairsofwires,
telecommunicationcircuits,radiosorsatellite.
Remote Terminal Unit (RTU)
Modbuswasoriginallydesignedtobeusedinaradio
environmentwherepacketsarebroadcastfromacentral
station(alsocalledmasterorhost)toagroupofremoteunits.
Eachremoteunit,RemoteTerminalUnit(RTU),hasa
hexidecimalidentificationnumber(ID).Thefirstpartof the
broadcastpacketcontains
anRTUIDwhichcorrespondstothe
IDofoneoftheremoteunits.TheModbushostlooksforthe
IDandsendstoonlytheunitwiththematchingID.TheRTU
wouldthenreplybacktothecentralstation.
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