Sierra Monitor Corporation Modbus Communications Interface User manual

TheSentryControllerModbusRTUCommunica-
tions Interface enables Sentry to easily communi-
cate with PC based Distributed Control Systems
andgraphicbasedhuman-machine interfaces and
viatheFieldServerTechnologiesgatewaytoawide
rangeofother protocols.
TheSentrysystemfromSierraMonitorofferscomprehen-
sive, cost effective solutions to many specific gas man-
agementrequirements. Fromasimple4-pointmonitoring
system to a complete plant wide hazardous gas monitor-
ing system with hundreds of gas detection points, Sentry
meets the need.
With the Modbus communications interface Sentry can
easilyinterface with aPC-based Distributed ControlSys-
temtoprovideagraphicaldisplayofhazardousgascondi-
tionsinthe plant. PC-based DCS softwareinconjunction
withSentryprovides the operator enhanceddataacquisi-
tion,alarmingandalarmmanagement,historicaltrending,
distributedarchitecture,andintegrationintotheplant’sdis-
tributed control system.
Sentry’s Modbus communication interface provides over
620different parametersaccessibleby thePC-basedDCS
software,including:
•gasconcentration
•alarmsetpoints
•sensordiagnostic messages
•historical reset time/date
•powerup/down time/date
•troublealarmtime/date
•minimum/maximumvaluesplus time/date
•high/lowalarmlatch/non-latched
•autocalibrationenabled
•calibrationstatus/coefficients
•calibrationconcentrations
•calibrationduedate
•zoneoptionenabled
•operatemode
UsingtheoptionalFieldServerTechnologiesGateway the
user can convert from the Modbus RTU output to a wide
variety of other protocols including DF1, DH+, Profibus,
ModbusTCP,ControlLogixandmany more.
FieldServerTechnologiesisadivisionofSierraMonitorCor-
poration.More informationonFieldServerproductscan be
foundatwww.fieldserver.com
Ordering Information
5387-50Modbus Communications Interface
4301-10ConverterRS-232/RS-485,9VDC
Sierra Monitor Corp. 1991 Tarob Ct., Milpitas, CA95035, USA, 408-262-6611, 800-727-4377, FAX: [phone]
Web Site: http://www.sierramonitor.com E-Mail: [e-mail]
©2009bySierraMonitorCorporation
Sentry
Modbus Communications Interface