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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3
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.

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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.

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1.5.3 Data Character Formats:
 Databits8databitspercharacter
 Parity  none
 Type  Asynchronouscharacter
 Stopbits1or2stopbitspercharacter
1.5.4 RS-232 Specications
Single-endedRS-232Cdriversandreceiversthataredesignedtooperate
withupto50feetofcable.
Transmit +9Vdc=Logic"0"orOn
Levels -9Vdc=Logic"1"orOff
Receive ±1.5Vdcminimum,±25VdcMaximum
Signals
4899A AA,AB,BA,BB,CA,CB,CDandCF
4809A
4819A AA,AB,BAandBB
 CCheldhigh,CAjumperedbacktoCB
1.5.5 RS-422/RS-485 Specications
The4809A,4829Aand4899AhavedifferentialRS-485linedriversand
receiversthatprovideRS-422andRS-485 compatiblesignals.Theline
driversandreceiversaredesignedto operate with up to 1200 meters of
twisted-paircable.Thetransmittercanbesetforcontinuousonfor4-wire
systemsoritcanbetristatedwhennottransmittingfor2-wiresystems.
Modes Transmitteronortristatedwhennottransmitting
Transmit +5Vdcdifferentialforbinary0orOn
Levels -5Vdcdifferentialforbinary1orOff
Receive ±0.2Vdcminimum,±25Vdcmaximum,
Levels differentialorsingle-endedinputwithotherinputline
biasedatmid-range.
Signals SD,RD,RS,CS,RRandTRsignalpairs

1-7
1
1.6 PROGRAMMABLE FUNCTIONS
AllunitsuseIEEE488.2andSCPIcommandstochangetheirprogram-
mablefunctionsandjumperstoselecttheserialsignals.Table1-1lists
theprogrammablefunctionsandtheirfactorydefaultsettings.The4899A
and4809AarefactorysetforRS-232signals.The4829Aisfactoryset
for4-wireoperation.
TABLE 1-1 FACTORY CONFIGURATION
Command Functions Factory
Setting
:ADDRess SetsGPIBbusaddress 4
:EXT EnablesExternalGPIBAddressSwitch OFF(4809Aonly)#
:BAUD Setstransmit/receivebaudrate 9600#
:PARity Setsparitytype NONE#
:CHECK Enablesparitychecking OFF#
:BITs Setsnumberofdatabitspercharacter 8#
:SBITs Setsnumberofstopbits/percharacter 1#
:RS485 Tristatetransmitterenabled OFF#
:FORMat Setstalkformatforresponsedata ASCii#
*ESE EnablesStandardEventStatusRegisterbits 0 
*SRE EnablesStatusByteRegisterbits 0
Notes:#indicatesaparameterthatcanbeblockedbytheLOCKcommand

1-8
1
1.7 INDICATORS
SixLEDsthatdisplaythefollowingconditions:
PWR - Indicatespoweron.
RDY - Indicatesunithaspassedselftest.
TALK - Indicatesunithasrecognizeditstalkaddress.
LSTN - Indicatesunithasrecognizeditslistenaddress.
SRQ - OnwhentheRQSbitisset.
ERR - OnwhenESRbits2thru6areseton.
Whenthe4899Aisturnedon,itperformsaninternalselftestwhichtakes
about0.5seconds.OnlythePWRindicatorisonduringselftest.Atthe
endoftheselftestthe4899AdisplaysitscurrentGPIBaddressbyblinking
thefrontpanelLEDsforone-halfsecond.TheGPIBaddressisthesumof
thebinarybitweights.TheLEDbitweightsare:
 RDY TALK LSTN SRQ ERR
 16 8 4 2 1
Anyerrorsfoundduringselftestareindicatedbyarepeatedblinkingofthe
errorcodepattern.Refertoparagraph5.4foradescriptionoftheselftest
errorsandtheirpossiblecauses.
Duringnormaloperation,theERRLEDindicatesthattherewasaproblem
withtheGPIBcommandorwiththeModbuscommunication.IftheERR
LEDilluminatesatpowerturn-on,itindicatesthattheunithasnotbeen
calibratedsincethememorywaslastinitialized.Refertoparagraph5.3.1
fordirectionsoncalibratingtheunit.

1-9
1
1.8 PHYSICAL
1.8.1 4899A Minibox
Size 7.45"Lx5.57"Wx1.52"H
 (18.92cmLx14.15cmWx3.86cmH)
 (SeeFigure1-1)
Weight 3lbs(1.4kg)includingadapter
Temperature Operating -10°Cto+55°C
 Storage  -40°Cto+70°C
Humidity 0-90%RHwithoutcondensation
Shock/VibrationNormalhandlingonly
Construction Allmetalcase
Power 9to32Vdc@3.5VA
Connectors IEEE488Interface
 Amphenol57-20240withmetricstuds
 SerialInterface
 CinchDB-25Sfemaleconnectorwithlockstuds

1-10
1
Figure 1-1 4899A Outline Dimensions
18.92 cm
Side View
14.15 cm
End View
3.86 cm
.254 cm
0.95 cm max connector

1-11
1
1.8.2 4809A Board Assembly
Size 5.50"Lx4.50"Wx0.5"H
 (139.7mmLx114.3mmWx12.7mmH)
 (SeeFigure1-2)
Weight 6oz.(0.17kg)
Temperature Operating-10°Cto+55°C
 Storage  -40°Cto+70°C
Humidity 0-90%RHwithoutcondensation
Shock/Vibration Normalhandlingonly
Construction Flame-retardantprintedcircuitboard
Power 5±0.25Vdc@300MA(regulated)
 5.5to12Vdc(unregulated)
Connectors GPIB-24-pin3M2524maleheader
 GPIB/AddressSw-26-pin3M2526maleheader
 Serial-26-pin3M2526maleheaderandDB-25Pmale
 connector.

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GPIB
Serial I/O
4809A
5.500
4.500
0.200
typ
8 plcs
0.150 dia hole
0.300 clear pad
1
1
1
RDY
LST
FULL
PWR
TLK
BSY
1
+ -
4819A
or
4829A
J1
GPIB
Connector
J2
Serial
Connector
J3
Device
Serial
Connector
Status
LEDs
4.50
4.00
0.190 dia mounting holes (4 plcs)
0.300 dia mounting pads
Mounting Blocks (2 plcs)
0.20 typ.
0.20 typ.
0.50 typ.
Figure 1-3 4819A/4829A Outline Dimensions
Figure 1-2 4809A Outline Dimensions

1-13
1
1.8.3 4819A and 4829A PHYSICAL
Size 4.00"Lx4.50"Wx0.7"H
 (10.16cmLx11.43cmWx1.78cmH)
 (SeeFigure1-3)
Weight 8oz(0.22kg)
Temperature Operating  -10°Cto+55°C
 Storage  -20°Cto+70°C
Humidity 0-90%RHwithoutcondensation
Shock/Vibration Normalhandlingonly
Construction Flame-retardantprintedcircuitboard.
 Connectorshellsgroundedtochassissupports 
 andmountingbrackets.
Power 5±0.25Vdc@300MA(regulated)
 5.5to12Vdc(unregulated)
Connectors GPIB-24-pinIEEE-488connectorwithmetric 
studs
 ExternalRS-232Interface-DE-9Smaleconnector
 withlockstuds
 InternalSerialInterface-DE-9Pfemaleconnector
 withlockstuds

1-14
1
1.9 4899A CERTIFICATIONS OR APPROVALS
EMI/RFI Meetslimitsforpart15,ClassAofUSFCCDocket
20780andcomplieswithEECStandardsEN55022and
50082-1.CECerticateofCompliancereproducedin
Figure1-4.
UL/CSA/VDE ACWalladapterhasapplicableUL/CSA/VDEandCE
approvals

1-15
1
Figure 1-4 4899A Certicate of Conformance
Certicate of Conformity
ApplicationofCouncilDirectives.......................................89/336/EEC
Standard(s)towhichConformityisDeclared.....EN55022,EN50082-
1
Manufacturer'sName  ICS Electronics div
Systems West, Inc.
Manufacturer'sAddress 473 Los Coches Street
Milpitas, CA 95035
USA
Importer'sName
Importer'sAddress
Typeofequipment  GPIB to Serial Converter
ModelNo.   4899
SerialNo.Thru,Yearofmanufacturer
I, the undersigned, hereby declare that the equipment specied above con-
forms to the above Directive(s) and Standard(s) by virtue of its similarity
with the Model 4894.
Place   
    Signature
Date   
    (FullName)
    Title
1999
Milpitas,CA, USA
Sept.14, 1999 Gerald K. Mercola
President