Agilent Technologies 6613C, 6634B Determining the Cause of a Service Interrupt, MSS Bit, RQS Bit

Page 35

Programming the DC Source - 3

The MSS Bit

This is a real-time (unlatched) summary of all Status Byte register bits that are enabled by the Service Request Enable register. MSS is set whenever the dc source has one or more reasons for requesting service. *STB? reads the MSS in bit position 6 of the response but does not clear any of the bits in the Status Byte register.

The RQS Bit

The RQS bit is a latched version of the MSS bit. Whenever the dc source requests service, it sets the SRQ interrupt line true and latches RQS into bit 6 of the Status Byte register. When the controller does a serial poll, RQS is cleared inside the register and returned in bit position 6 of the response. The remaining bits of the Status Byte register are not disturbed.

The MAV Bit and Output Queue

The Output Queue is a first-in, first-out (FIFO) data register that stores dc source-to-controller messages until the controller reads them. Whenever the queue holds one or more bytes, it sets the MAV bit (4) of the Status Byte register.

Determining the Cause of a Service Interrupt

You can determine the reason for an SRQ by the following actions:

Step 1

Determine which summary bits are active. Use:

 

*STB? or serial poll

Step 2

Read the corresponding Event register for each summary bit to determine which events

 

caused the summary bit to be set. Use:

 

STATus:QUEStionable:EVENt?

 

STATus:OPERation:EVENt?

 

ESR?

 

When an Event register is read, it is cleared. This also clears the corresponding

 

summary bit.

Step 3

Remove the specific condition that caused the event. If this is not possible, the event

 

may be disabled by programming the corresponding bit of the status group Enable

 

register or NTRPTR filter. A faster way to prevent the interrupt is to disable the service

 

request by programming the appropriate bit of the Service Request Enable register

Servicing Operation Status and Questionable Status Events

This example assumes you want a service request generated whenever the dc source switches to the CC (constant current) operating mode, or whenever the dc source’s overvoltage, overcurrent, or overtemperature circuits have tripped. From figure 3-7, note the required path for a condition at bit 10

(CC)of the Operation Status register to set bit 6 (RQS) of the Status Byte register. Also note the required path for Questionable Status conditions at bits 0, 1, and 4 to generate a service request (RQS) at the Status Byte register. The required register programming is as follows:

Step 1

Program the Operation Status PTR register to allow a positive transition at bit 10 to be

 

latched into the Operation Status Event register, and allow the latched event to be

 

summed into the Operation summary bit. Use:

 

STATus:OPERation:PTR 1024;ENABle 1024

Step 2

Program the Questionable Status PTR register to allow a positive transition at bits 0,

 

1, or 4 to be latched into the Questionable Status Event register, and allow the latched

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Contents Programming Guide Printing History Safety GuidelinesTable of Contents Internally Triggered Measurements Language DictionaryOutput Commands Example Programs Error MessagesScpi Conformance Information Compatibility LanguageDocumentation Summary About this GuideScpi References External ReferencesGpib References System Requirements VXIplug&play Power Products Instrument DriversDownloading and Installing the Driver Supported ApplicationsGpib Address Accessing Online HelpGpib Capabilities of the DC Source RS-232 Capabilities of the DC SourceBaud Rate RS-232 Flow ControlRS-232 Programming Example Boldface font RS-232 TroubleshootingIntroduction to Scpi Conventions Used in This GuideMultiple Commands in a Message Types of Scpi CommandsMoving Among Subsystems Including Common CommandsUsing Queries Types of Scpi MessagesMessage Unit Separator Query IndicatorMessage Unit HeadersResponse Data Types Scpi Data FormatsNumerical Data Formats Suffixes and MultipliersUsing Device Clear Scpi Command CompletionPage Enabling the Output Power-on InitializationIntroduction Programming the OutputMaximum Current Output VoltageOutput Current Maximum VoltageOutput Trigger System Model Setting the Voltage or Current Trigger LevelsTriggering Output Changes Scpi Triggering NomenclatureGenerating Triggers Initiating the Output Trigger SystemDC Measurements Making MeasurementsVoltage and Current Measurements Current Ranges RMS Measurements Agilent 66312A, 66332A OnlySequence Form Alias SEQuence2 ACQuire Internally Triggered MeasurementsMeasurement Trigger System Model BUS Generating Measurement Triggers Agilent 66312A, 66332A OnlyTrigger Commands Used to Measure Output Pulses Pulse Measurement Queries Measuring Output Pulses Agilent 66312A, 66332A OnlyCurrent Detector Multiple Measurements Agilent 66312A, 66332A Only Controlling Measurement SamplesVarying the Voltage or Current Sampling Rate Pre-event and Post-event Triggering Pulse Measurement Example Agilent 66312A, 66332A onlyOption Base Programming the Status Registers Power-On ConditionsOperation Status Group Status Byte Register Questionable Status GroupStandard Event Status Group RQS Bit Determining the Cause of a Service InterruptServicing Operation Status and Questionable Status Events MSS BitRemote Inhibit RI Inhibit/Fault IndicatorMonitoring Both Phases of a Status Transition Discrete Fault Indicator DFIPin Using the Inhibit/Fault Port as a Digital I/OBit Weight DFI Programming ExamplePage Language Dictionary Subsystem CommandsSubsystem Commands Syntax ALC DFISubsystem Commands Syntax Output Programming Parameters Common CommandsCommon Commands Syntax Programming ParametersCALibrateCURRentMEASureLOWRange Calibration CommandsCALibrateCURRent CALibrateCURRentNEGativeCALibrateLEVel CALibratePASSwordCommand Syntax CALibrateSAVE Parameters None Examples CALibrateDATAQuery Syntax CALibrateSTATe? CALibrateSTATeCALibrateVOLTage CALibrateVOLTagePROTectionQuery Syntax Measurement CommandsMEASureARRayCURRent? FETChARRayCURRent? MEASureARRayVOLTage? FETChARRayVOLTage?FETChCURRent? applies to Agilent 66312A, 66332A Only MEASureCURRent? FETChCURRent?MEASureCURRentACDC? FETChCURRentACDC? MEASureCURRentHIGH? FETChCURRentHIGH?MEASureCURRentMINimum? FETChCURRentMINimum? MEASureCURRentLOW? FETChCURRentLOW?MEASureCURRentMAXimum? FETChCURRent MAXimum? FETChVOLTage? applies to Agilent 66312A, 66332A Only MEASureVOLTage? FETChVOLTage?MEASureVOLTageACDC? FETChVOLTageACDC? MEASureVOLTageHIGH? FETChVOLTageHIGH?MEASureVOLTageMINimum? FETChVOLTageMINimum? MEASureVOLTageLOW? FETChVOLTageLOW?MEASureVOLTageMAXimum? FETChVOLTageMAXimum? Returned Parameters NR3 SENSeCURRentRANGeSENSeCURRentDETector Unit a amperes *RST Value MAX high rangeSENSeSWEepTINTerval SENSeFUNCtionSENSeSWEepOFFSetPOINts SENSeSWEepPOINtsReturned Parameters CRD SENSeWINDowHANNing RECTangularOUTPutDFISOURce Output CommandsOUTPut OUTPutDFIOUTPutPROTectionCLEar OUTPutPROTectionDELayOUTPutPONSTATe Query Syntax OUTPputRELayPOLarity? OUTPutRELayOUTPutRELayPOLarity OUTPutRIMODESOURceCURRentPROTectionSTATe Default SuffixSOURceCURRent SOURceCURRentTRIGgerQuery Syntax SOURceDIGitalDATA? SOURceDIGitalDATASOURceDIGitalFUNCtion SOURceVOLTageAgilent 66332A, 6631B, 6632B, 6633B and 6634B Only SOURceVOLTageALCBANDwidth? SOURceVOLTageALCBWIDth?SOURceVOLTageTRIGger SOURceVOLTagePROTectionSTATusOPERationCONDition? Status CommandsSTATusPRESet STATusOPERation?STATusOPERationNTR STATusOPERationPTR STATusOPERationENABleQuery Syntax STATusOPERationENABle? Parameters Preset ValueSTATusQUEStionableCONDition? STATusQUEStionableENABleSTATusQUEStionable? STATQUESNTR?STATQUESPTR? Command Syntax *CLS Parameters NoneSTATusQUEStionableNTR STATusQUEStionablePTR CLSOPC Bit Configuration of Standard Event Status Enable RegisterESE ESR?Example PSCSRE PSC onNR1 register binary value Bit Configuration of Status Byte RegisterSTB? WAIDISPlayTEXT System CommandsDISPlay DISPlayMODEParameters none Returned Parameters NR2 SYSTemERRor?SYSTemLANGuage SYSTemVERSion?IDN? SYSTemLOCalSYSTemREMote SYSTemRWLockRST Command Syntax RCL NRf Parameters ExampleOPT? RCLTST? RST SettingsCommand Syntax SAV NRf Parameters Example SAVINITiateCONTinuousSEQuence1 INITiateCONTinuousNAME Trigger CommandsABORt INITiateSEQuence INITiateNAMEAbor Currtrig Init *TRG Volttrig TRIGgerTRIGgerSOURce TRIGgerSEQuence2 TRIGgerACQuireTRIGSEQ2COUNCURR 5 Trigacqcouncurr TRIGgerSEQuence2COUNtCURRent TRIGgerACQuireCOUNtCURRentTRIGgerSEQuence2COUNtVOLTage TRIGgerACQuireCOUNtVOLTage Parameters RST Value ExamplesTRIGSEQ2HYSTCURR TRIGSEQ2LEVVOLT TRIGSEQ2HYSTVOLT TRIGSEQ2LEVCURRTRIGSEQ2LEVCURR TRIGSEQ2HYSTVOLT TRIGgerSEQuence2LEVelCURRent TRIGgerACQuireLEVelCURRentTRIGgerSEQuence2LEVelVOLTage TRIGgerACQuireLEVelVOLTage TRIGSEQ2LEVVOLT TRIGSEQ2HYSTCURRTRIGSEQ2SLOPVOLT TRIGgerSEQuence2SLOPeCURRent TRIGgerACQuireSLOPeCURRentTRIGgerSEQuence2SLOPeVOLTage TRIGgerACQuireSLOPeVOLTage TRG Parameters None Related CommandsTRIGgerSEQuence2SOURce TRIGgerACQuireSOURce TRIGgerSEQuence1DEFine TRIGgerSEQuence2DEFinePage Scpi Version Scpi Confirmed CommandsNon-SCPI Commands Page Command Setting Table B-1. COMPatibility Power-on Settings CommandASTS? CLR Table B-2. COMPatibility Commands CompatibilityERR? FAULT? ID? IOUT? Similar Scpi CommandTable B-2. COMPatibility Commands Description Similar Scpi Compatibility CommandError Table B-2. COMPatibility CommandsCompatibility Description Command These commands determine the conditions that will set bitsFAU Norm Fast INH ERR UNR +CCRQS ERR RDY Page Bit Set Error Number Error Code Error Type Error Number ListTable C-1. Error Numbers Error Number Page National Instruments Gpib Driver Assigning the Gpib Address in ProgramsTypes of DOS Drivers Agilent 82335A DriverBasic Controllers Error HandlingExample Programs D Call IBCLRPS% Example 2. IBM Controller Using National InterfaceCODES$=*CLS Option Base Example 3. Controller Using BasicIndex 100 IndexScpi 101102 Manual Updates
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