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Fluke 2620A, 2625A user manual Using the Computer Interface, Computer Interface Command Set

Models: 2625A 2620A

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Using the Computer Interface	4
Computer Interface Command Set

Table 4-8. Command and Query Reference (cont)

LOG_MODE

LOG_MODE?

LWLS

MAX?

Determines treatment of new scan data when memory is full (RS-232 only)

LOG_MODE <mode>

0Wrap around. When memory is full, oldest scans are discarded to make room for new scans. This is the default mode.

1Discard new scans. New scans are stored only when memory becomes available. (See LOG? and LOG_CLR.)

The LOG_MODE setting is non-volatile and cannot be changed from the instrument front panel. An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit.

Query treatment of new scan data when memory is full (RS-232 only)

0 or 1 is returned, signifying the mode set with the LOG_MODE command. An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit

Local with Lockout (RS-232 only)

Enter the IEEE-488.1 local with front panel lockout (LWLS) state. All front panel buttons are disabled. The REM annunciator is not lit.

Channel’s Maximum Value

Returns maximum value(s) for channels measured in the most recent scan. The value returned represents data from the most recent scan. The most recent scan is the scan in progress or, if scanning is not in progress, the last completed scan.

MAX? <channel> <channel> = (0 .. 20)

Leave the channel specification field blank if values for all defined channels are desired. An Execution Error results if a request is made for a channel defined as OFF, the channel specified is invalid, the channel specified has been set up but not yet measured, or Review array values have been cleared. The response is a signed number with decimal point and exponent. For slow scanning rate, 5 digits are returned (+/- XX.XXXE+/-X); for fast scanning rate, 4 digits are returned (+/-XX.XXE+/- X). The range setting determines placement of the decimal point.

For maximum values of all defined channels (no channel specification made), undefined (OFF) channels are not included. For each defined channel, a separate signed number with decimal point and exponent is returned. Commas separate numbers for different channels, and no blank spaces are included.

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Fluke 2620A, 2625A Using the Computer Interface, Computer Interface Command Set, 8. Command and Query Reference cont

Contents

Hydra Series II Data Acquisition Unit Hydra Series II Data Logger 2620A/2625AUsers Manual 5/94 LIMITED WARRANTY & LIMITATION OF LIABILITYOverview Table of ContentsTitle IntroductionOperating the Instrument from the Front Panel Using the Computer Interface2620A/2625A Additional Considerations Using the IEEE-488 InterfaceComputer Interface Command Set Using Shielded WiringIndex Maintenance2620A/2625A AppendicesTitle List of TablesAmendment 1 IPTS-68 Performance Tests for RTD Temperature Function DIN/IEC 751 Amendment2620A/2625A Performance Tests Voltage, Resistance, and FrequencyHydra DB-9 to PC DB-9 RS-232 Connection Generic List of FiguresTitle 4-Terminal Connections to Decade Resistance Boxviii Interference InformationDeclaration of the Manufacturer or Importer Bescheinigung des Herstellers/Importeurs∙ Remove inputs from live voltages before opening the input module Safety Terms in this ManualSymbols Marked on Equipment To avoid electric shock2620A/2625A AC Power SourceDC Power Source Use the Proper Power CordThe Basics Getting StartedSetting Up a Channel IntroductionSelecting the Scan Data Destination 2620A/2625AGetting Started continued Taking MeasurementsViewing Minimum, Maximum, and Last Data Values 2620A/2625APress Mto activate the Monitor function oo24f.eps LAST MIN MAX LAST MIN MAXUsers Manual 2620A/2625APage IntroductionChapter TitleUsers Manual 2620A, 2625AIEEE-488 Interface Assembly Options and AccessoriesThe Hydra Series II Data Acquisition Unit The Hydra Series II Data Logger2620A, 2625A Table 1-1. Hydra FeaturesIntroduction Where to go From HereAccessories Where to go From HereChapter 1 Introduction Chapter 4 Using the Computer InterfaceChapter 6 Maintenance Getting StartedTitle OverviewChapter Users Manual 2620A, 2625AUnpacking and Inspecting the Instrument Setting Up the InstrumentIntroduction Adjusting the HandleFront/Rear Panel Features Line PowerFigure 2-2. Front Panel Setting Up the InstrumentOverview Figure 2-5. Annunciators Figure 2-3. Left DisplayFigure 2-4. Right Display Table 2-1. Display Annunciators Setting Up the InstrumentOverview Figure 2-6. Rear View 2620A, 2625ATable 2-1. Display Annunciators cont Input Channels Operating ModesTurning the Instrument On Right Display Front Panel DisplayReading the Display Left DisplaySelecting a Channel Front Panel ButtonsUsing the Buttons N O L K Setting up a ChannelSetting up a Channel Alarm Limits Setting Alarm Limits and Mx+B Scaling ValuesMx+B Scaling Setting the Scan IntervalReviewing Channel Data Using the Monitor FunctionUsing the Scan Function Viewing the Totalizer Count Using External DC Power2620A, 2625A Using the Rack Mount KitSetting Date and Time of Day Operating the Instrument from the Front PanelUsing the Digital I/O Lines Changing the Temperature UnitComputer Interface-Initiated Lockouts 2620A, 2625AFront Panel Review Only Function Front Panel Monitor Only FunctionOperating Modes Configuration ModeFigure 3-1. Configuration Mode IntroductionIf Power is Interrupted What is the Present Configuration?Channel Configuration Other Displayed Datacleared for all channels Table 3-1. Configuration Reset SettingsChannels 4-20 assigned to digital I/O lines 4-7, as follows Page Operating the Instrument from the Front Panel Channel Configuration2620A, 2625A Operating the Instrument from the Front Panel Setting AlarmsAlarm Limits Channel ConfigurationGAGE Alarm IndicationsUsing the Digital I/O Lines Resetting Alarm ConditionsB to define the scaling values Table 3-8. Initial Alarm Assignments, Digital I/O Lines 4 ThroughMx+B Scaling Page Entering and Changing Numeric Values Instrument ConfigurationSelecting the Measurement Rate Selecting Scan IntervalTable 3-11. Measurement Rate Selection Changing the Temperature UnitTriggering External Triggering∙ Remove inputs from live voltages before opening the input module Measurement ConnectionsSetting Date and Time of Day To avoid electric shockDC Volts, AC Volts, Frequency, and Thermocouples Figure 3-2. Input Module Connections Operating the Instrument from the Front PanelMeasurement Connections STRAIN RELIEFResistance and RTD USE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL Operating the Instrument from the Front PanelMeasurement Connections Connections TotalizingReview Array GeneralList Button Functions Note1 Table 3-16. List Button OperationMemory Storage AutoprintFront Panel Monitor Only Function Front Panel Lock out ConditionsFront Panel Review Only Function Computer Interface-Initiated Lockouts REM AnnunciatorCalibration Users Manual 2620A, 2625ATitle Using the Computer InterfaceInstalling the IEEE-488 Interface Chapter4-19 Service Request Enable RegisterComputer Interface Command Set Status Byte RegisterOtherwise, if a baud rate appears, the RS-232 interface is enabled Using the RS-232 Computer InterfaceTo determine which computer interface is enabled, select COMM K L. If IEEE appears on the display, the IEEE-488 interface is enabledSetting Communication Parameters RS-232 Autoprint Output Format Autoprint and Memory Storage RS-232Autoprint Computer Interface Control 5 -3.2345 mMX+B H/R12123.87 kOHMS/L1731.268VAC ALM15DIO204TOTAL0 Memory Storage Computer Interface ControlMemory Retrieval 07420102/09/91Cabling the Instrument to a Host or Printer RS-232 Memory Full OperationClearing Memory Character Echoing Installation TestDevice Clear Using Ctrl C RS-232 InformationRS-232 Prompts Using the IEEE-488 InterfaceSample Program Using the RS-232 Computer Interface Installing the IEEE-488 InterfaceFigure 4-2. Sample Program 2620A, 2625AFigure 4-2. Sample Program cont Using the Computer InterfaceUsing the IEEE-488 Interface Table 4-2. IEEE-488.1 Capabilities Description Table 4-3. IEEE-488 Setup BaudAddressEnabling the IEEE-488 Interface CapabilityHow the Instrument Processes Input General Information RS-232 and IEEE-488Installation Test Typical Input Strings Input StringsThe instrument stores received input in a 350-byte input buffer Input TerminatorsFUNC 12, TEMP, K Using the Computer InterfaceGeneral Information RS-232 and IEEE-488 FUNC 1, OHMS, 3How the Instrument Processes Output Sending Numeric Values to the Instrument RS-232 and IEEE-488Sending Input Strings to the Instrument Service Requests IEEE-488 only and Status Registers 2620A, 2625A 7 6 ESBOutput Queue Table 4-4. Status Byte Register Description Event Status and Event Status Enable RegistersStatus Byte Register NameReading the Status Byte Register Instrument Event Register Service Request Enable RegisterComputer Interface Command Set Table 4-7. Command and Query Summary Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-7. Command and Query Summary contTable 4-7. Command and Query Summary cont Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-8. Command and Query ReferenceTable 4-8. Command and Query Reference cont Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A DOstate Using the Computer InterfaceComputer Interface Command Set limitnum =Set instrument calendar values Return alarm limit data for specified channel and limit2620A, 2625A Computer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contIf the channel indicated is invalid, an Execution Error is generated. For valid channels, two or three comma-separated data fields are returned. One of the following function definitions is returned in the first data field Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-8. Command and Query Reference contLOCK LOCK? LOCS LOG? Using the Computer InterfaceComputer Interface Command Set LOGGED? LOGBIN? LOGCLR LOGCOUNT? 2620A, 2625ATable 4-8. Command and Query Reference cont Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-8. Command and Query Reference contEnables monitoring of given channel if monitoring Next Scan’s Values Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Computer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contComputer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contTOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER Using the Computer InterfaceComputer Interface Command Set Trigger Type Query alarm2620A, 2625A TRIGGER?When Measuring Resistance or Temperature RTD Additional ConsiderationsExternal Trigger Enabled Type Monitor Alarm Enabled TypeUsers Manual 2620A, 2625AThese two additional trigger mechanisms are mutually exclusive Measurement RateAdvanced Trigger Mechanisms IntroductionREMS, a *TRG can be generated from the front panel by pressing Q Both External and Monitor Alarms Disabled TypeExternal Trigger Enabled Type Advanced Trigger Mechanisms Additional ConsiderationsMonitor Alarm Enabled Type When Measuring Resistance or Temperature RTDThermal Voltages oo16f.eps When Measuring Resistance or Temperature RtdAdditional Considerations Waveform Comparison True RMS vs Average Responding True RMS MeasurementsEffects of Internal Noise in AC Measurements Making Mixed Measurements Making Mixed MeasurementsTO DISPLAY RMS FOR SINE WAVES 2620A, 2625AFigure 5-3. Comparison of Common Waveforms WWarning Using Shielded WiringNon-Isolated Sensor Configuration Isolated and Shielded Sensor ConfigurationIn More Detail Chapter MaintenanceThermocouple Temperature Accuracy Test Dedicated Alarm Output TestUsers Manual 2620A, 2625AWhen the instrument is powered up, the entire display lights CleaningSelf-Test Diagnostics and Error Codes Line FusePerformance Tests Performance Tests MaintenanceError Table 6-1. Power-Up Error Codes DescriptionRecommended Model Table 6-2. Recommended Test Equipment Minimum Specification2620A, 2625A Instrument TypeChannel Integrity Test Accuracy Verification Test20 mV 2620A, 2625ATable 6-3. Performance Tests Voltage, Resistance, and Frequency cont Thermocouple Measurement Range Accuracy Test4-Terminal Resistance Test Thermocouple Temperature Accuracy Test OUTPUT 2620A, 2625AEX SNS EX GRDJ K N E T Open Thermocouple Response TestDECADE RESISTANCE BOX HYDRA INPUT MODULERTD Temperature Accuracy Test Using Decade Resistance Source RTD Temperature Accuracy TestDigital Input/Output Verification Tests RTD Temperature Accuracy Test Using DIN/IECDigital Input Test Digital Output TestDOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CR DECIMAL VALUE Totalizer TestTERMINAL GROUNDED Table 6-7. Digital Input Values STATE OF DIGITAL INPUTSTotalizer Sensitivity Test Dedicated Alarm Output Test V ΩA 2620A, 2625ACalibration CalibrationExternal Trigger Input Test Variations in the Display ServiceTitle AppendicesAppendix Page Introduction SpecificationsAppendix A Accuracies at Ambient Temperatures Other Than Specified2620A/2625A DC Voltage InputsNormal Mode Rejection Common Mode RejectionAppendices Thermocouple Inputs2620A/2625A Input Impedance RTD InputsCommon Mode and Normal Mode Rejection Appendices2620A/2625A AC Voltage Inputs2-Wire Accuracy Maximum Sensor TemperatureAppendices 2620A/2625A Crest Factor ErrorCommon Mode Rejection DC Component ErrorInput Protection Ohms Inputs2-Wire Accuracy AppendicesSensitivity Frequency Inputs2620A/2625A Frequency RangeA-11 Typical Scanning RateAppendices 2620A/2625A Maximum Autoranging TimeTotalizing Input Digital InputsThreshold Trigger InputAppendices IsolationBattery Life Digital and Alarm OutputsReal-Time Clock and Calendar EnvironmentalAppendices GeneralCommon Mode Voltage Weight2620A/2625A 2625A Data Storage2620A Options PowerAppendix B ASCII & IEEE-488 Bus CodesASCII & BUS CODES The initial power-up device setting is Channels 0 - 20OFF IEEE-488.2 Devise Documentation RequirementsAppendix C Implementation of IEEE StandardOpen Thermocouple Detection OTC enabled Alarm parameters Limit-1 and Limit-2 OFF. All limit valuesAlarm assignments Channels 0-3 assigned to outputs 0-3,respectively Digital I/O lines high non-alarm Totalizer 0, with debounce disabledPROGRAM MESSAGE UNIT PROGRAM MESSAGE UNIT SEPARATOR COMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADERThe following queries return data in two formats ALARMLIMIT? AppendicesThere are no device-to-device messages The *CAL? command not implemented an optional commandThe *RDT and *RDT? commands are not implemented 2620A/2625AAppendices Operation complete is generated when the command is parsed2620A/2625A Introduction Signal Cross Talk in a DC Voltage ChannelMaking Mixed Measurements Appendix DRatio worst case AC Signal Cross Talk Into an AC Voltage ChannelAC Signal Cross Talk Into an Ohms Channel AC Signal Cross Talk Into a Frequency Channel2.0 × AC Signal Crosstalk Into a Temperature ChannelTEMPERATURE Error Ratio = ⎢ 5.0 ×2620A/2625A Introduction Binary Upload of Logged Data LOGBIN? 2625A onlyAppendix E Decoding the ASCII StringFigure E-1. ASCII String Decoding 2620A/2625AAppendices Floating Point Conversion2620A/2625A ExampleFigure E-2. Floating Point Conversion AppendicesFigure E-3. Example 2620A/2625ACables RS-232 CablingAppendix F ConnectionsPRINTER 2620A/2625ARS43 PRINTERDCD Rx Tx DTR GND DSR RTS CTS RI RTS - REQUEST TO SEND CTS - CLEAR TO SEND RI - RING INDICATORAppendices RS43 CABLE NULL MODEMTx Rx RTS CTS DSR GND DCD 2620A/2625ARx Tx DTR GND DSR RTS CTS RS40 CABLE OR EQUALFigure F-4. Hydra DB-9 to Modem DB-25 RS-232 Connection AppendicesTx Rx RTS CTS DSR GND DCD 2620A/2625ARx Tx DTR GND DSR RTS CTS RS42 CABLE OR EQUALAppendices Figure F-6. RS-232 DB9 and DB-25 Connectors2620A/2625A Hydra Configuration Record Index