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Agilent Technologies 6614C, 6634B Types of SCPI Messages, Moving Among Subsystems, Using Queries

Models: 6632B 6633B 66332A 6634B

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2 - Introduction to Programming

Moving Among Subsystems

In order to combine commands from different subsystems, you need to be able to reset the header path to a null string within a message. You do this by beginning the command with a colon (:), which discards any previous header path. For example, you could clear the output protection and check the status of the Operation Condition register in one message by using a root specifier as follows:

OUTPut:PROTection:CLEAr;:STATus:OPERation:CONDition?

The following message shows how to combine commands from different subsystems as well as within the same subsystem:

VOLTage:LEVel 20;PROTection 28; :CURRent:LEVel 3;PROTection:STATe ON

Note the use of the optional header LEVel to maintain the correct path within the voltage and current subsystems, and the use of the root specifier to move between subsytems.

Including Common Commands

You can combine common commands with system commands in the same message. Treat the common command as a message unit by separating it with a semicolon (the message unit separator). Common commands do not affect the header path; you may insert them anywhere in the message.

VOLTage:TRIGgered 17.5;:INITialize;*TRG

OUTPut OFF;*RCL 2;OUTPut ON

Using Queries

Observe the following precautions with queries:

♦Set up the proper number of variables for the returned data.

♦Read back all the results of a query before sending another command to the dc source. Otherwise a Query Interrupted error will occur and the unreturned data will be lost.

Types of SCPI Messages

There are two types of SCPI messages, program and response.

♦A program message consists of one or more properly formatted SCPI commands sent from the controller to the dc source. The message, which may be sent at any time, requests the dc source to perform some action.

♦A response message consists of data in a specific SCPI format sent from the dc source to the controller. The dc source sends the message only when commanded by a program message called a "query."

The following figure illustrates SCPI message structure:

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Agilent Technologies 6614C manual Types of SCPI Messages, Moving Among Subsystems, Including Common Commands, Using Queries

Contents

Dynamic Measurement DC Source System DC Power SupplyProgramming Guide Agilent Models 66312A, 66332ASafety Guidelines Printing History2 - INTRODUCTION TO PROGRAMMING Table of Contents1 - GENERAL INFORMATION 3 - PROGRAMMING THE DC SOURCE4 - LANGUAGE DICTIONARY Output Commands Status CommandsB - COMPATIBILITY LANGUAGE C - ERROR MESSAGESA - SCPI CONFORMANCE INFORMATION D - EXAMPLE PROGRAMSDocumentation Summary General InformationAbout this Guide SCPI References External ReferencesGPIB References Introduction to Programming VXIplug&play Power Products Instrument DriversDownloading and Installing the Driver Supported ApplicationsRS-232Capabilities of the DC Source Accessing Online HelpGPIB Capabilities of the DC Source GPIB AddressBaud Rate RS-232Flow ControlRS-232Programming Example Conventions Used in This Guide RS-232TroubleshootingIntroduction to SCPI Types of SCPI Commands Multiple Commands in a MessageTypes of SCPI Messages Including Common CommandsUsing Queries Moving Among SubsystemsHeaders Query IndicatorThe Message Unit Message Unit SeparatorSuffixes and Multipliers SCPI Data FormatsNumerical Data Formats Response Data TypesSCPI Command Completion Using Device ClearPage Introduction Power-onInitializationProgramming the DC Source Programming the OutputMaximum Voltage Output VoltageOutput Current Maximum CurrentSCPI Triggering Nomenclature Setting the Voltage or Current Trigger LevelsTriggering Output Changes Output Trigger System ModelInitiating the Output Trigger System Generating TriggersMaking Measurements Voltage and Current MeasurementsRMS Measurements Agilent 66312A, 66332A Only Current RangesSCPI Triggering Nomenclature Internally Triggered MeasurementsMeasurement Trigger System Model 3 - Programming the DC Source Page Current Detector Pulse Measurement QueriesMultiple Measurements Agilent 66312A, 66332A Only Controlling Measurement SamplesVarying the Voltage or Current Sampling Rate Figure 3-6. Pre-eventand Post-eventTriggering Programming the DC Source RQS ,**$ Power-OnConditionsProgramming the Status Registers Signal Operation Status GroupTable 3-1.Bit Configurations of Status Registers CommandStatus Byte Register Questionable Status GroupStandard Event Status Group CommandThe RQS Bit Determining the Cause of a Service InterruptThe MSS Bit The MAV Bit and Output QueueDiscrete Fault Indicator DFI Inhibit/Fault IndicatorMonitoring Both Phases of a Status Transition Remote Inhibit RIFAULT/INHIBIT Using the Inhibit/Fault Port as a Digital I/ODFI Programming Example Bit WeightPage Introduction Subsystem CommandsLanguage Dictionary Table 4-1.Subsystem Commands Syntax Table 4-1.Subsystem Commands Syntax continued Table 4-1.Subsystem Commands Syntax continued Table 4-2.Common Commands Syntax Common CommandsProgramming Parameters Table 4-3.Output Programming ParametersCALibrate CURRent NEGative Calibration CommandsCALibrate CURRent CALibrate CURRent MEASure LOWRangeCALibrate LEVel CALibrate PASSwordCALibrate DATA CALibrate SAVECALibrate VOLTage PROTection CALibrate STATeCALibrate VOLTage CAL STAT 1,6812 CAL STAT OFFMEASure ARRay VOLTage? FETCh ARRay VOLTage? Measurement CommandsMEASure ARRay CURRent? FETCh ARRay CURRent? MEASure CURRent HIGH? FETCh CURRent HIGH? MEASure CURRent? FETCh CURRent?MEASure CURRent ACDC? FETCh CURRent ACDC? MEASure CURRent MINimum? FETCh CURRent MINimum? MEASure CURRent LOW? FETCh CURRent LOW?MEASure CURRent MAXimum? FETCh CURRent MAXimum? MEASure VOLTage HIGH? FETCh VOLTage HIGH? MEASure VOLTage? FETCh VOLTage?MEASure VOLTage ACDC? FETCh VOLTage ACDC? MEASure VOLTage MINimum? FETCh VOLTage MINimum? MEASure VOLTage LOW? FETCh VOLTage LOW?MEASure VOLTage MAXimum? FETCh VOLTage MAXimum? SENS CURR DET ACDC SENSe CURRent RANGeSENSe CURRent DETector SENSe:SWEep:POINts SENSe FUNCtionSENSe SWEep OFFSet POINts SENSe SWEep TINTervalRECTangular SENSe WINDowHANNing Returned Parameters CRDOUTPut DFI Output CommandsOUTPut OUTPut DFI SOURceOUTPut PROTection CLEar OUTPut PROTection DELayOUTPut PON STATe OUTP PON STAT RSTOUTPut RI MODE OUTPut RELayOUTPut RELay POLarity OUTP REL POL NORMSOURce CURRent PROTection STATe SOURce CURRentSOURce CURRent TRIGger CURR PROT STAT 1CURRENT PROTECTION STATE ONSOURce VOLTage SOURce DIGital DATASOURce DIGital FUNCtion DIG DATASOURce VOLTage TRIGger SOURce VOLTage ALC BANDwidth?SOURce VOLTage ALC BWIDth? SOURce VOLTage PROTectionSTATus OPERation? Status CommandsSTATus PRESet STATus OPERation CONDition?STATus OPERation NTR STATus OPERation PTR STATus OPERation ENABleSTATUS OPERATION ENABLE? STATus QUEStionable CONDition? STATus QUEStionable ENABleSTATus QUEStionable? STAT QUES COND? STATUS QUESTIONABLE CONDITION?Preset Value STATus QUEStionable NTR STATus QUEStionable PTRCommand Syntax Related CommandsQuery Syntax Returned Parameters Related Commands ESR?Command Syntax Parameters Power-OnValue Examples Related CommandsPage STB? DISPlay System CommandsDISP TEXT DEFAULT MODE DISPlay MODESYSTem VERSion? SYSTem ERRor?SYSTem LANGuage Query Syntax SYSTem ERRor? Parameters NoneSYSTem RWLock SYSTem LOCalSYSTem:REMote IDN?OPT? TST? INITiate SEQuence INITiate NAME Trigger CommandsABORt INITiate CONTinuous SEQuence1TRIGger SEQuence2 TRIGger ACQuire TRIGgerTRIGger SOURce TRIGger SEQuence2 COUNt VOLTage TRIGger SEQuence2 COUNt CURRentTRIGger ACQuire COUNt CURRent TRIGger ACQuire COUNt VOLTageTRIGger SEQuence2 HYSTeresis VOLTage TRIGger SEQuence2 HYSTeresis CURRentTRIGger ACQuire HYSTeresis CURRent TRIGger ACQuire HYSTeresis VOLTageTRIGger SEQuence2 LEVel VOLTage TRIGger SEQuence2 LEVel CURRentTRIGger ACQuire LEVel CURRent TRIGger ACQuire LEVel VOLTageTRIGger SEQuence2 SLOPe VOLTage TRIGger SEQuence2 SLOPe CURRentTRIGger ACQuire SLOPe CURRent TRIGger ACQuire SLOPe VOLTageTRIGger SEQuence2 SOURce TRIGger ACQuire SOURce TRIGger SEQuence1 DEFine TRIGger SEQuence2 DEFinePage SCPI Conformance Information SCPI Confirmed CommandsNon-SCPICommands SCPI VersionPage Compatibility Language IntroductionSimilar SCPI Command Table B-2.COMPatibility CommandsCompatibility Command DescriptionCommand Compatibility CommandTable B-2.COMPatibility Commands continued DescriptionTable B-2.COMPatibility Commands continued Figure B-1.COMpatibility Status Model Page Error Messages Error Number ListError String Description/Explanation/Examples Table C-1.Error Numbers continuedError Number Error String Description/Explanation/Examples Error NumberTable C-1.Error Numbers continued Page Types of DOS Drivers Example ProgramsAssigning the GPIB Address in Programs IntroductionError Handling BASIC ControllersExample Programs - D 990’----------------------Merge DECL.BAS here 1225 Example 3. Controller Using BASIC INDEX Index Page waiting for measurement results varying voltage or current sampling, 29 voltagemaximum, 20 measurements XON-XOFF,111/4/00 Manual Updates11/9/99 All references to HP have been changed to Agilent