Agilent Technologies 6834B, 6814B, 6843A manual Hardware Handshake

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2 - Installation

Hardware Handshake

The RS-232 interface uses the DTR (data terminal ready) line as a holdoff signal to the bus controller. When DTR is true, the bus controller may send data to the ac source. When DTR goes false, the bus controller must stop sending data within 10 characters, and must not send any more data until DTR goes true again. The ac source sets DTR false under two conditions.

1.When the input buffer is full (approximately 100 characters have been received), it will set DTR false. When enough characters have been removed to make space in the input buffer, DTR will be set to true, unless condition 2 (see below) prevents this.

2.When the ac source wants to "talk", which means that it has processed a query, and has seen a <newline> message terminator, it will set DTR false. This implies that once a query has been sent to the power source, the bus controller should read the response before attempting to send more data. It also means that a <newline> must terminate the command string. After the response has been output, the ac source will set DTR true again, unless condition #1 prevents this.

The ac source monitors the DSR (data set ready) line to determine when the bus controller is ready to accept data. It checks this line before each character is sent, and the output is suspended if DSR is false. When DSR goes true, transmission will resume. The ac source will leave DTR false while output is suspended. A form of deadlock exists until the bus controller asserts DSR true to allow the ac source to complete the transmission.

Control-C is the equivalent to the GPIB device clear command. It clears the operation in progress and discards any pending output. For the control-C character to be recognized by the power source while it holds DTR false, the bus controller must first set DSR false.

Null modem RS-232 interface cables swap the DTR and DSR lines as shown in the following figure. For other bus controllers or languages, you must determine what form of hardware handshake is used. You may have to build a customized cable to connect the holdoff lines as necessary. If your bus controller does not use hardware handshaking, tie the DSR input to the ac source to a signal that is always true. This implies that your bus controller must always be ready to accept data. You may want to set the baud rate to either 2400 or 4800 baud to ensure that this is true.

bus controller

ac source

TxD (3)

TxD (3)

RxD (2)

RxD (2)

*DTR (4)

DTR (4)

*DSR (6)

DSR (6)

Ground (5)

Ground (5)

 

 

Figure 2-7. Null Modem Interface Lines

Response Data Terminator

All RS-232 response data sent by the ac source is terminated by the ASCII character pair <carriage return><newline>. This differs from GPIB response data which is terminated by the single character <newline>.

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Contents AC Power Solutions Agilent Models 6814B, 6834B, and 6843A User’s GuideWarranty Information CertificationSafety Summary GeneralSafety Symbols Declaration EMCAcoustic Noise Information Printing HistoryTable of Contents Specifications Supplemental Characteristics Performing the Calibration ProcedureError Number List Entry Keys Examples of Front Panel ProgrammingDocument Orientation TopicLocation Safety Considerations Options, Accessories, and User Replaceable PartsOption Description Agilent Part NumberDescription CapabilitiesModel Description Output Characteristic Front Panel/Remote OperationRanges AC Source Output Characteristic in real-time mode Output VA CapabilityPage Cleaning InspectionDamage Packaging Material Items SuppliedLocation Bench OperationRack Mounting Not block the fan exhaust at the rear of the unitInstalling the Power Cord Input ConnectionsInput Source and Line Fuse Output Connections Output ConnectionsWire Considerations Voltage DropsCurrent Ratings Ampacity and Resistance of Stranded Copper ConductorsRemote Sense Connections Remote Sense ConnectionsTrigger Connections Digital ConnectionsOVP Considerations Output RatingGpib Connector Controller ConnectionsInterface Commands RS-232 ConnectorRS-232 Interface RS-232 Data FormatHardware Handshake Null Modem Interface Lines Response Data TerminatorIntroduction Preliminary CheckoutUsing the Keypad Checkout ProcedureProcedure Display Explanation VoltProtclear Voltprot CurrlevCurrprot Currprot OFFError Messages Case of TroubleLine Fuse Page Front Panel Description Front Panel, Overall ViewAC+DC Display Command Function System KeysAnnunciator On Phase Selected Function KeysImmediate Action Keys Scrolling Keys Meter Display KeysDisplay Measurement KBESSEL, RectOutput Control Keys DisplayRST Protection and Status Control Keys CLSTrigger and List Control Keys InitimmedIMM AbortEntry Keys Through Are used for entering numeric values Is the decimalSetting the Output Voltage Amplitude Procedure for Single-Phase AC SourcesExamples of Front Panel Programming Set the output to 120 V rms as followsProcedure for Three-Phase AC Sources Phase 3 to 235 VrmsAction Display To verify the output, you can measure it as followsSetting the Output Frequency Setting a Protection FeatureOvercurrent protection feature as follows Using Transient Voltage Modes Step TransientVoltt Voltm StepPulse Transient Voltm PulseWidth DcycleList Transient ActionVoltm Fixed Voltm List Count Trigger Delays and Phase Synchronization Volt EOL Step AutoSyncsour Phase Example DisplaySyncphas Initimmed Voltm Step Syncsour Phase Syncphas Initimmed ExampleUsing Slew Rates to Generate Waveforms Programming Slew RatesVoltm Fixed SlewStep Slewm SlewtSyncsour Phase Syncphas Measuring Peak Inrush CurrentRange CurrpeakSetting the Gpib Address and RS-232 Parameters To configure the RS-232 interface, proceed as followsSaving and Recalling Operating States Action Display To set the Gpib address, proceed as followsAddress Noutputs Specifications Table A-1. Performance Specifications1Agilent 6814B Agilent 6834B Agilent 6843A Supplemental Characteristics Table A-2. Supplemental CharacteristicsSpecifications a Page Characteristics Equipment RequiredRecommended Model Test Setup Turn-On Checkout ProcedurePerforming the Verification Tests Voltage Programming and Measurement Accuracy RMS Current Readback AccuracyAction Normal Result Performing the Calibration Procedure Agilent 6814B Current Measurement AccuracyAgilent 6834B Current Measurement Accuracy Agilent 6843A Current Measurement AccuracyEnable Calibration Mode Front Panel CalibrationFront Panel Calibration Menu Calibrating and Entering Voltage Calibration Values Calibrating the OVP trip pointCalibrating and Entering Current Calibration Values Changing the Calibration Password Calibrating the Output Impedance Agilent 6843A onlySaving the Calibration Constants CalpassCalibration Error Messages Table B-3. Gpib Calibration Error MessagesCalibration Over the Gpib Agilent Calibration Program ListingFigure B-2. Calibration Program Listing Sheet 1 Figure B-2. Calibration Program Listing Sheet 2 Page Error Number List Table C-1. Error NumbersError Messages Error Messages C Page Index Index Index United States Latin America Canada Australia/New ZealandEurope Asia Pacific JapanManual Updates
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6834B, 6843A, 6814B specifications

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