ICS ELECTRONICS 4809A User manual

ICS
ELECTRONICS
ICS
a division of Systems West Inc.
MODEL 4809A, 4819A, 4829A and 4899A
GPIB Modbus Interfaces
Instruction Manual
MODBUS

i
MODEL 4809A, 4819A, 4829A, 4899A
GPIB Modbus Interface
Instruction Manual
7034 Commerce Circle, Pleasanton, CA 94588
Phone [phone], Fax [phone] Publication Number 120148
Web Site http://www.icselect.com April 2017 Edition Rev 19
ICS
ELECTRONICS
ICS
division of Systems West Inc.

ii
LIMITED WARRANTY
Within 12 months of delivery, ICS Electronics will repair or replace this product, at
our option, if any part is found to be defective in materials or workmanship (labor is
included). Return this product to ICS Electronics, or other designated repair station,
freight prepaid, for prompt repair or replacement. Contact ICS for a return material
authorization (RMA) number prior to returning the product for repair.
CERTIFICATION
ICS Electronics Corporation certies that this product was carefully inspected and
tested at the factory prior to shipment and was found to meet all requirements of
the specication under which it was furnished.
EMI/RFI WARNING
This equipment generates, uses, and can radiate radio frequency energy and, if not
installedandusedinaccordancewiththeinstructionmanual,maycauseinterference
to radio communications. The Model 4899A has been tested and found to comply
with the limits for a Class A computing device pursuant to Subpart J of Part 15 of
the FCC Rules and to comply with the EEC Standards EN 55022 and EN 50082-1,
which are designed to provide reasonable protection against such interference when
operated in a commercial environment. Operation of this equipment in a residential
area is likely to cause interference, in which case the user, at his own expense, will
be required to take whatever measures may be required to correct the interference.
The Models 4809A, 4819A and 4829A boards should be tested for RFI/EMI compli-
ance as a component in the user's equipment.
Certicate of Compliance reproduced in Figure 1-4.
TRADEMARKS
The following trademarks referred to in this manual are the property of the fol-
lowing companies:
VEE is a trademark of Agilent, Palo Alto, CA
LabView is a Trademark of National istruments, Austin, TX
ICS and GPIB AnyWhere are trademarks of ICS Electronics, Pleasanton, CA
© 2000-2017 ICS Electronics div of Systems West Inc.

General Information
 ProductDescriptions,Specications,FactoryConguration,Physical
Characteristics, Certications andAccessories List.
Installation
 Shipment Check, Installation Guide,  Conguration Instructions,
GPIB and Serial Connections,  Internal Jumper Settings and Rack
Mounting instructions.
Operation
 Operation Description, GPIB Addressing, 488.2 Commands, SCPI
Commands,ModbusCommands,ProgrammingGuidelinesandOEM
Documentation.
Theory of Operation
 Block diagram Description
Maintenance, Troubleshooting and Repair
 Maintenance,Troubleshootingguide,SelftestErrorCodesandRepair
Directions
Appendices
 A1 IEEE 488 Bus Description, IEEE 488.2 Message Formats,
Common Commands and SCPI Commands
 A2 Serial Communication and Interfacing
 A3 GPIB Connector/Switch Board Description and Installation
Index
Contents
2
4
5
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1
A

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Thispageleftintentionallyblank.

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1
General Information
1.1 INTRODUCTION
ThissectionprovidesthespecicationsforICS'sModel4809A,4819A
4829Aand4899AGPIB<->ModbusInterfacesandtheiraccessoryitems.
Models4809A,4819Aand4829AarePCboardassembliesdesignedfor
mountinginsideanotherpieceofequipment.TheModel4899Aisanen-
closedMinibox™productdesignedforbenchtopusewithotherequipment.
Allthreeproductsarefunctionallyequivalent.Themanualdescribesthe
units'functionsbyreferringtothe4899Abut,whereverthetextreferstothe
Model4899A,italsoappliestotheothermodelsunlessotherwisestated.
Anymodeldifferencesarenotedinparenthesisorinseparateparagraphs.
1.2 DESCRIPTION
TheModel4809A/4819A/4829A/4899AGPIB<->ModbusInterfacesare
IEEE-488.2/GPIB to Serial Interfaces with special rmware to control
ModbusRTUSlavedevicesfromtheGPIBorHP-IBbus.Theylettheuser
sendsimplecommandswithASCIIvaluesovertheGPIBbustocontrol
andqueryslaveModbusdevices.EachinterfaceconvertsGPIBcommands
intotheModbusprotocolandaddstheCRCchecksumtomakeacomplete
ModbusRTUmessage.ThemessagesaresentseriallyoveraRS-232link
oroveraRS-485network.Responsesarecheckedandvalidresponsedata
fromaqueryisreturnedtotheGPIBbuswhenthe4899Aisnextaddressed
totalk.The4809Aand4899AhandlebothRS-232andRS-485Modbus
devices.The4819AhandlesonlyRS-232deviceswhilethe4829Ahandles
onlyRS-422/RS-485devices.
Theunitscontainanumberofadvancedfeaturesthatincreasetheirex-
ibilityandsimpliestheiruseinsystemapplications.AllhaveIEEE-488.2

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compatible interfaces with an expanded Status Reporting Structure that
complieswiththeSCPIstandard.SCPIcommandsareusedtosettheunit's
GPIBaddress,tosettheserialconguration,andtoenablebitsintheStatus
ReportingStructuretogenerateSRQs.Theusercan alsoenterhisown
IDNmessagetopersonalizetheunitaspartofhisassembly.Allsettings
aresavedinnonvolatilememory.
TheModel4899AispackagedinasmallMinibox™metalcasethatisless
than1Uinheight(1.6inches)Thefrontpanelcontainsthepowerswitchand
LEDswhichindicatetheunit'sstatus.TherearpanelcontainstheGPIBand
serialconnectorsandaDCpowerjack.The4899Aacceptsawiderangeof
DCvoltagesandisshippedwithanadapterforthelocalpowerlines.The
4899Acanbeusedasastand-aloneboxorrackmountedinsideastandard
19-inchwideequipmentrack.
TheModel4809Aisasmall,low-prolePCassemblydesignedformount-
inginsidethehostchassis.Ithastwoat-ribbonconnectorsforitsGPIB
signals.Oneconnectorcanbeconnectedtoapanel-mountedGPIBconnector
onapin-to-pinbasis.ThesecondconnectormatestooneofICS'sGPIB
Connector/AddressSwitchAssemblieswhichmountaGPIBconnectorand
anGPIBaddressswitchontherearpanelofthehostchassis.ICS'sGPIB
Connector/AddressSwitchAssembliesareavailableintwomountingstyles
asdescribedinAppendix3.TheRS-232andRS-422serialsignalsare
availableonaat-ribbonheaderandonaDB-25Pconnector.The4809A
hasthesamestatusLEDsasthe4899Aandrunson5to12voltpower.
TheModel4819Aand4829AaresmallPCassemblieswithGPIBandRS-
232serialinterfaces.Botharedesignedtobemountedtotherearpanelof
thehostchassissotheGPIBandexternalserialconnectorsprotrudethrough
therearpanel.BothinterfacescanbeusedtocontroltheinternalModbus
device.The4819AORstheexternalserialinputandtheserialModbuspack-
etsgeneratedbyGPIBbuscommandsintoasingle-endedRS-232signalsto
drivetheinternalModbusdevice.Modbusdeviceresponsesareavailableat
eitherinterface.The4819AhasthesamediagnosticLEDsasthe4899Aand
runson5to12voltpower.The4829AprovidesdifferentialRS-422/RS-485
signalstodrivemultipleModbusslavedevices.The4829Aalsoincludes
theRS-232toRS-485conversionfunctionsoexternalRS-232signalscan
beusedtocontroltheinternalRS-422/RS-485Modbusdevice.

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1.3 MODEL 4809A/4819A/4829A/4899A SPECIFICATIONS
Thefollowingspecicationsapplytoallmodels.Optionsforyourunit
maybefoundbycomparingthelistbelowtothoselistedontheseriallabel
onyourunit.
4899A-X GeneralModelNumber
OptionCodes
-1 SpecialCrystal
-3 CustomPaint
-5 CustomFrontPanel
-7 SpecialProgram
-9 FactoryInstalledRackMountKit
-A ShipwithAustralian230VacAdapter
-B ShipwithBritish230VacAdapter
-E ShipwithEuropean230VacAdapter
BaseModelNumber
4899A-MiniboxProduct
4809A-BoardProduct
114922-4809Aboardonlyversion
4819A-BoardProduct
115122-4819Aboardonlyversion
4829A-BoardProduct
115782-4829Aboardonlyversion
Noteoptions-3,-5,-9,andtheACadaptersdonotapplytotheModel
4809Aor4819Aandtotheirboardonlyversions.
The48x9AversioninterfaceshaveadditionaloatingpointModbuscom-
mandsnotavailableintheoriginal48x9interfaces.The48x9Aseriesunits
arefullycompatiblewiththeoriginal48x9interfaces.

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1.4 IEEE 488 INTERFACE
1.4.1 488.1 Capabilities
The488BusinterfacemeetstheIEEESTD488.1-19A87standardandhas
thefollowingcapabilities:
SH1,AH1,T6,L3,SR1,PP0,DC1,RL0,DT0,C0and
E1/E2drivers.
1.4.2 Address Ranges
Primaryaddresses 0-30
1.4.3 Buffers
GPIBinput  2kbytes
GPIBoutput  1kbytes
Serialinput/output 256bytes
1.4.4 488.2 Common Commands
The4899AconformstoIEEESTD488.2-19A87.Whenaddressedtolistenin
thecommandmode,theunitrespondstothefollowing488.2commands:
*CLS,*ESE,*ESE?,*ESR?,*IDN?,*OPC,*OPC?,*PSC*RCL,*RST,
*SAV,*SRE,*SRE?,*STB,*TST?,and*WAI.
1.4.5 SCPI Parser
The extended SCPI parser complies with the SCPI Standard Version
1994.0.

1-5
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1.5 SERIAL MODBUS INTERFACE
The4899Aand4809A'sserialModbusinterfaceprovidesRS-232single-
endedandRS-485(RS-422)differentialsignals.Signalsareselectedby
internaljumpers.The4899AhasaDB-25Sconnectoronitsrearpanel,
the4809Ahasa26-pinat-ribbonheaderandaDB-25Pconnector.Signal
pinoutsconformtoEIARS-530specicationandarelistedinTable2-2.
The4819AprovidesRS-232single-endedsignalsonaDE-9Sconnector.
DCE/DTEjumpersletuserexchangeTXandRXsignalpinnumbers.Signal
pinoutsarelistedinTable2-3.
The4829AprovidesRS-422/RS-485differentialsignalpairsonaDE-9S
connector.On-boardjumpersletuserconnecttheTXandRXsignalpairs
togetherfor2-wirenetworks.TheRXpairincludesaterminationnetwork
forbiasing2-wirenetworks.SignalpinoutsarelistedinTable2-4.
1.5.1 Modbus RTU Messages
MessagesconformtotheModbusRTUformatandincludethedevicead-
dress,command,registernumber,dataandCRCformattedasbinarybytes.
SupportedModbuscommandsare:01,02,03,04,05,06,07,08,and16for
integervaluesandcommands03and16foroatingpoint32-bitvalues.
 Integerrange 16bitsor0to65,536
 Floatingpoint IEEE-754
1.5.2 Baud Rates:
Parserselectsclosestratetospeciedratewhenanonstandardrateentered.
Standardratesare:50,110,300,600,1200,2400,4800,7200,9600,14400,
19200,28800,38400,57600,76800and115200baud.
BaudRates: 4899A-Anyratefrom50to115,200baud.
 4809A-Anyratefrom50to38,400baud.
 4819A-Anyratefrom50to57,600baud.
 4829A-Anyratefrom50to57,600baud.