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Fluke 45 user manual Setting Communication Parameters RS-232

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Setting Communication Parameters (RS-232)

45

Users Manual

To determine which computer interface is enabled, press in POWER to turn the meter on. Press S, then press R. If "baud" and a rate are displayed, the RS-232 interface is enabled; if "IEEE" is displayed, the IEEE-488 interface is enabled.

Preparing the Meter for Operations via the RS-232 Interface

The RS-232 interface allows ASCII, asynchronous, serial communication between the meter and a host, a serial printer, or terminal.

Setting Communication Parameters (RS-232)

The communication parameters for the RS-232 computer interface are shown in Table 5-1 as they are set when the meter leaves the factory. Interface, baud rate and parity parameters can be set directly by the user; data bit and stop bit parameters cannot.

In order for the meter and host to communicate via the RS-232 interface, the communication parameters of the meter must match those of the host. Setting RS-232 communication parameters can only be done from the front panel. If the communications parameters of the host and meter do not match, proceed as follows to select the appropriate baud rate and parity parameters for the meter:

1.Press in the POWER button on the front panel to turn the meter on.

2.Press S, then press R.

The baud rate currently selected is shown in the primary display, and "baud" is shown in the secondary display.

Table 5-1. Factory Settings of RS-232 Communication Parameters

Parameter

Interface

Baud Rate

Parity

Number of Data Bits

Number of Stop Bits

Echo

Factory Setting

RS-232 (Print-only rate set to 0) 9600

None (Parity bit 0)

8 (7 Data bits plus 1 parity bit)

1 On

3.Press Uor Tto scroll to the desired baud; then press Eto set the selected baud rate.

If a baud rate other than "IEEE" is selected, the RS-232 interface is enabled, and the list editor is invoked on parity.

4.Press Uor Tto scroll to "E" for even, "Odd", or "no" for none; then press E to set the parity.

5."Echo" now appears on the secondary display, and "On" or "OFF" appears on the primary display.

When Echo is "On", each command sent to the meter over the RS-232 interface is "echoed" to the host’s display screen. If Echo is "OFF", commands are not echoed.

To select an Echo mode, press Tor Uto select "OFF" or "On", respectively. Then press Eto set the selected Echo state.

5-2

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Fluke 45 user manual Setting Communication Parameters RS-232

Contents

Users Manual Dual Display MultimeterLIMITED WARRANTY & LIMITATION OF LIABILITY Interference Information Safety ClassDeclaration of the Manufacturer or Importer Page Title Table of ContentsIntroduction Getting StartedApplications Operating the Meter Using the Computer InterfaceAppendices MaintenancePage Table List of TablesTitle Performance Tests for mA Current Functions Replacement PartsPerformance Tests for A Current Functions Users ManualFigure List of FiguresTitle Chapter IntroductionIntroducing the Fluke 45 Dual Display Multimeter WWarningWhere to go from Here Options and AccessoriesChapter 1: Introduction Chapter 2: Getting started Chapter 6: MaintenanceChapter 4: Applications AppendicesUsers Manual TO AVOID ELECTRICAL SHOCK OR OTHER INJURY WWARNINGMULTIMETER SAFETY Page Line Power Adjusting the HandleGetting Started IntroductionFigure 2-1.Front Panel Users ManualFigure 2-2.Rear Panel Turning the Meter on Using the PushbuttonsFigure 2-4.Summary of Basic Pushbutton Operations Users ManualAutomatic Input Terminal Selection Selecting a Measurement RangeTaking Some Basic Measurements WWarningMeasuring Voltage, Resistance, or Frequency Diode/Continuity TestingMeasuring Current FREQ FREQGetting Started Taking Some Basic MeasurementsFigure 2-8.Diode Testing Figure 2-7.Continuity TestingUsers Manual CIRCUITRack Mounting Operating the Meter Under Battery Power OptionalOperating the Meter Under Battery Power Optional Users Manual 2-10Front Panel Operations Operating the Meter From the Front PanelChapter IntroductionPrimary Display DisplaySecondary Display MAX dB REL AUTO REMOTE SMFEXT TRG MIN HOLDFigure 3-4.Input Terminals Input TerminalsRanging Selecting a Measurement FunctionE, U, T AutorangingFigure 3-5.Function Selection Buttons Users ManualRanging Operating the Meter From the Front PanelManual Ranging Measuring FrequencyFrequency Ranging Frequency Sensitivity Selection Frequency Measurement RatesOperating the Meter From the Front Panel Measuring FrequencyK, I, H, J Selecting A Function ModifierWWarning REL Relative Readings ModifierOperating the Meter From the Front Panel Selecting A Function ModifierdB Decibels and Audio Power Modifier HOLD Touch Hold Modifier Using Function Modifiers in CombinationMN MX Minimum Maximum Modifier Selecting A Measurement Rate Rate Using the SButtonSelecting A Function Modifier Operating the Meter From the Front Panel3-15 PushbuttonsThe List and Number Editors Using The Compare Comp FunctionUsing the List Editor Using the Number Editor Factory Settings of Power-UpConfiguration Power-UpConfigurationChanging the Power-UpConfiguration Calibration Applications Using the Dual DisplayChapter IntroductionUsing Measurement Functions in Combination Applications Using the Dual DisplayResponse Times How the Meter Makes Dual Display Measurements How the Meter Makes Dual Display MeasurementsMeas Function Users ManualExternal Trigger Update Rate in the Dual Display ModeThermal Voltages Two-WireConfiguration When Measuring ResistanceTrue RMS Measurements Correcting for Test Lead ResistanceCalculated AC + DC RMS Measurements Effects of Internal Noise in AC MeasurementsApplications Figure 4-3.Waveform Comparison ChartTrue RMS Measurements 4-11Users Manual 4-12Local and Remote Operations Operating the Meter Using the Computer InterfaceComputer Interfaces ChapterSetting Communication Parameters RS-232 RS-232 Print-OnlyMode Cabling the Meter to a Host or Printer RS-232 Device Clear Using ^C CNTRL CCharacter Echoing and Deletion RS-232PromptsIEEE-488Operating Limitations Installing the IEEE-488InterfaceEnabling the IEEE-488Interface Addressing the MeterInstallation Test for RS-232Operations Getting Started With An Installation TestInstallation Test for IEEE-488Operations Cabling the Meter to a HostIf Test Fails How the Meter Processes InputInput Strings Input TerminatorsTypical IEEE-488Input Strings Sending Command Strings to the MeterSending Numeric Values to the Meter 1.Commands to configure the meter if any Users Manual 5-10Figure 5-1.Typical IEEE-488Input Strings Triggering Output How the Meter Processes OutputExternal Triggering from the Front Panel External Triggering via the Computer Interface Setting the Trigger Type ConfigurationTable 5-3.Trigger Type Read Command Event Status Enable RegisterWrite Command Enable Register& & & & 7 6 5 4 3 2 1 & & & & & & & & Event Status and Event Status Enable RegistersReading the Status Byte Register Status Byte RegisterService Request Enable Register IEEE-488Capabilities and Common Commands Computer Interface Command SetCommand Table 5-9. IEEE-488Common Commands5-20 Users ManualComputer Interface Command Set Operating the Meter Using the Computer InterfaceTable 5-10. IEEE-488Common Commands cont CommandFunction Modifier Commands and Queries Function Commands and QueriesTable 5-11.Function Commands and Queries CommandsComputer Interface Command Set Operating the Meter Using the Computer InterfaceCommand Table 5-12.Function Modifier Commands and Queries5-24 CommandUsers Manual DescriptionOperating the Meter Using the Computer Interface Range and Measurement Rate Commands and QueriesComputer Interface Command Set 5-25TRIGGER 5, unexpected results will be obtained Measurement Queries5-26 Users ManualTrigger Configuration Commands Compare Commands and QueriesCommand Miscellaneous Commands and QueriesTable 5-17.Miscellaneous Commands and Queries 5-28Operating the Meter Using the Computer Interface RS-232Remote/Local ConfigurationsComputer Interface Command Set Command5-30 Sample Program Using the RS-232Computer InterfaceUsers Manual aam23f.eps5-31 Operating the Meter Using the Computer Interfaceaam24s.tif Users Manual 5-32aam25s.tif 5-33 Operating the Meter Using the Computer Interfaceaam26s.tif Users Manual 5-34aam27s.tif 5-35 Operating the Meter Using the Computer InterfaceCleaning MaintenanceLine Fuse WWarningCurrent Input Fuses Testing Current Input FusesReplacing the 10 A Input Fuse Replacing the 100 mA Input FuseWWarning WWarningPerformance Tests Self-TestDiagnostics and Error CodesService Function Users ManualRange Rate Input LevelMaintenance Replacement PartsReplacement Parts •Quantity •Fluke Part Number •Part DescriptionUsers Manual Table 6-5.Replacement Parts cont DESCRIPTIONITEM FLUKE PART NOAppendix AppendicesPage SpecificationsUsers Manual Appendix A SpecificationsDisplay Counts and Reading Rates RS-232and IEEE-488Reading Transfer RatesInput Impedance DC VoltageNormal Mode Rejection Ratio Common Mode Rejection RatioTrue RMS AC Voltage, AC-Coupled Decibel ResolutionAppendices Maximum InputMaximum Crest Factor Decibel Reference ResistanceAC + DC Voltage Accuracy Input ImpedanceAC Current DC CurrentAppendices Maximum InputMaximum Crest Factor AccuracyMaximum Input Users ManualDiode Test/Continuity OhmsOpen Circuit Voltage Input ProtectionSensitivity of AC Voltage FrequencySensitivity Level of AC Current Open Circuit VoltageSpecifications A EnvironmentalAppendices Options GeneralUsers Manual Appendix B ASCII/IEEE-488Bus CodesUsers Manual ASCII/IEEE-488Bus Codes B AppendicesPage Appendix C IEEE-488.2Device Documentation RequirementsImplementation of IEEE Standard IntroductionNo commands are coupled All queries generate a response when parsedDevice-specificcommands used NUMERIC RESPONSE DATA>•Format 2: <NR3 NUMERIC RESPONSE DATA> < UNIT> •Format 1: <NR3 NUMERIC RESPONSE DATA>MEASUREMENT Volts dcThere are no additional data structures The *RDT and *RAT? commands are not implemented