Agilent Technologies 6813B, 6811B, 6812B 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 6811B, 6812B, and 6813B User’s GuideWarranty Information CertificationSafety Summary GeneralSafety Symbols Declaration EMCAcoustic Noise Information Printing HistoryTable of Contents Introduction Performing the Calibration ProcedureEntry Keys Examples of Front Panel Programming Performing the Verification TestsError Number List Line Voltage ConversionPage Document Orientation TopicLocation Earlier AC Source Models Safety ConsiderationsOptions and Parts OptionsDescription Operator Replaceable PartsAgilent Part Number Front Panel/Remote Operation CapabilitiesModel Description Steady-state Output Characteristic Steady-state Output Characteristic in real-time modePeak Inrush Example Peak Current/Dynamic Power CapabilityPeak Current Limit Typical Peak Current Output CapacitiesIpeak setting Capacitance in μF 127 254Output Impedance RMS Current Limit CircuitVoltage Regulation Real Time RegulationOutput Coupling Page Damage Packaging Material CleaningInspection Items SuppliedRack Mounting LocationBench Operation Not block the fan exhaust at the rear of the unitInstalling the Power Cord Input ConnectionsInput Source and Line Fuse Connecting the Power Cord Output ConnectionsVoltage Drops Wire ConsiderationsRemote Sense Connections Current RatingsRemote Sense Connections Trigger Connections Digital ConnectionsRemote Sensing and OVP Considerations Gpib Connector Controller ConnectionsRS-232 Interface Interface CommandsRS-232 Connector RS-232 Data FormatHardware Handshake Null Modem Interface Lines Response Data TerminatorIntroduction Preliminary CheckoutUsing the Keypad Checkout ProcedurePress Protect Press 1, 2, 0, EnterPress Output On/Off Press 1, 6, 0, EnterPower-On Selftest Errors Error MessagesSelftest Errors Case of TroubleIndicates Runtime Error MessagesLine Fuse May appear at runtimePage Front Panel Description Front Panel, Overall ViewAC+DC Dis lay Command Function System KeysFunction Keys Immediate Action KeysScrolling Keys Display Measurement Display Command FunctionMeter Display Keys DisplayOutput Control Keys ListRST Protection and Status Control Keys ProtclearCLS IMM Trigger and List Control KeysInitimmed AbortEntry Keys Through Are used for entering numeric values Is the decimalSetting the Output Voltage Amplitude Examples of Front Panel ProgrammingSet the output to 120 V rms as follows To verify the output, use the meter menu Setting the Output FrequencySetting the DC Offset ActionBit Number Bit Weight Setting a Protection FeatureOvercurrent protection feature as follows Clearing Protection ConditionsUsing Transient Voltage Modes PulseVoltt Step TransientPulse Transient Voltm StepWidth List TransientVoltm Pulse DcycleDwel EOL Volt Trigger Delays and Phase SynchronizationVoltm Fixed List Count Dwel Volt EOL Step AutoSyncsour Phase Example DisplaySyncphas Initimmed Using Slew Rates to Generate Waveforms Programming Slew RatesStep Slewm Voltm FixedSlew SlewtCurrlev Syncsour Phase SyncphasMeasuring Peak Inrush Current CurrpeakSaving and Recalling Operating States Setting the Gpib Address and RS-232 ParametersTo configure the RS-232 interface, proceed as follows Action Display To set the Gpib address, proceed as followsSpecifications Table A-1. Performance Specifications1Table A-1. Performance Specifications Supplemental Characteristics Table A-2. Supplemental CharacteristicsTrig Out HC TTL output Trig In 10k pullup Operation Below 45 Hz Table A-3. Operation Below 45 HzPage Verification and Calibration Equipment RequiredTest Setup Table B-1. Equipment RequiredRecommended Model AC Voltage Programming and Measurement Accuracy Turn-On Checkout ProcedurePerforming the Verification Tests Action Normal ResultVolt 0, Outpcoup DC, Offset DC Voltage Programming and Measurement AccuracyRMS Current Accuracy Test Volt 50, Currrange LOW, CurrlevDC Programming and Measurement Accuracy Table B-2. Agilent 6811B Verification Test RecordTable B-3. Agilent 6812B Verification Test Record RMS Current Measurement AccuracyTable B-3 Table B-4. Agilent 6813B Verification Test RecordPerforming the Calibration Procedure Front Panel Calibration MenuEnable Calibration Mode Front Panel CalibrationCalibrating and Entering Voltage Offset Values Calibrating and Entering DC Voltage Gain Values Calibrating and Entering AC rms Voltage Gain ValuesCallev P4 Calibrating the OVP Trip Point Calibrating and Entering rms Current ValuesSaving the Calibration Constants Calibrating and Entering rms Current Measurement ValuesCalibrating the Output Impedance OFFTable B-5. Gpib Calibration Error Messages Changing the Calibration PasswordCalibration Error Messages Calibration Over the GpibFigure B-2. Calibration Program Listing Sheet 1 Figure B-2. Calibration Program Listing Sheet 2 Figure B-2. Calibration Program Listing Sheet 3 Page Error Number List Table C-1. Error NumbersError Messages Error Messages C Page Open the Unit Check the Jumper Wire Model Agilent 6811B/6812B onlyCheck the Power Transformer Connector all Models Check the Line Jumpers all ModelsClose the Unit Figure D-1. Line Voltage Conversion ComponentsIndex Index Index Europe Asia Pacific United States Latin AmericaCanada Australia/New Zealand JapanManual Updates
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