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Agilent Technologies E3634A, E3633A RS-232 Interface Configuration, RS-232 Configuration Overview

Models: E3634A E3633A

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RS-232 Interface Configuration

Chapter 3 Front-Panel Operation

RS-232 Interface Configuration

RS-232 Interface Configuration

You connect the power supply to the RS-232 interface using the 9-pin (DB-9) serial connector on the rear panel. The power supply is configured as a DTE (Data Terminal Equipment) device. For all communications over the RS-232 interface, the power supply uses two handshake lines: DTR (Data Terminal Ready, on pin 4) and DSR (Data Set Ready, on pin 6).

The following sections contain information to help you use the power supply over the RS-232 interface. The programming commands for RS-232 are explained on page 101.

RS-232 Configuration Overview

Configure the RS-232 interface using the parameters shown below. Use the

front-panel I/OConfig key to select the baud rate, parity, and number of data bits (see page 59 for more information to configure from the front panel).

•Baud Rate: 300, 600, 1200, 2400, 4800, or 9600 baud (factory setting)

•Parity and Data Bits: None / 8 data bits (factory setting)

Even / 7 data bits, or

Odd / 7 data bits

•Number of Start Bits: 1 bit (fixed)

•Number of Stop Bits: 2 bits (fixed)

RS-232 Data Frame Format

A character frame consists of all the transmitted bits that make up a single character. The frame is defined as the characters from the start bit to the last stop bit, inclusively. Within the frame, you can select the baud rate, number of data bits, and parity type. The power supply uses the following frame formats for seven and eight data bits.

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Agilent Technologies E3634A manual RS-232 Interface Configuration, RS-232 Configuration Overview, RS-232 Data Frame Format

Contents

$JLOHQW$DQG$ &3RZHU6XSSOLHV User’s Guide3DUW1XPEHU $SULO ‹&RS\ULJKW$JLOHQW7HFKQRORJLHV,QF $OO5LJKWV5HVHUYHGFlexible system features Agilent E3633A and E3634A DC Power SuppliesConvenient bench-top features The Front Panel at a Glance For Agilent E3633A Model **For Agilent E3634A Model Front-Panel Voltage and Current Limit Settings Display Annunciators The Rear Panel at a Glance In This Book Page Contents ContentsChapter 4 Remote Interface Reference ContentsContents Execution Errors Self-Test Errors Calibration Errors ContentsContents ContentsChapter 8 Specifications Output Isolation Multiple Loads Remote Voltage SensingGeneral Information General Information Safety ConsiderationsSafety and EMC Requirements Options Options and AccessoriesAccessories Chapter 1 General Information Description DescriptionVoltage and current programming Voltage and current readback from the terminals so there is no operator access to the output conductors without Cooling and Location InstallationInitial Inspection Chapter 1 General Information Installation Rack Mounting Chapter 1 General Information Installation Power-Line Voltage Selection Input Power RequirementsPower-Line Cord 100 or 115 Vac, 6.3 AT fuse 230 Vac, 3.15 AT fuse Chapter 1 General Information Input Power Requirements Initial Operation Initial Operation Preliminary Checkout ADDR 05 or RS-232 Power-On CheckoutVoltage Output Checkout Output CheckoutOutput On/Off Display Limit Voltage Current Current Output CheckoutPage Chapter 2 Initial Operation Output Checkout Front-Panel Operation Front-Panel Operation Chapter 3 Front-Panel Operation Front-Panel Operation Overview Front-Panel Operation OverviewConstant Voltage Operation preset current limit and the output voltage will drop proportionately Display Limit Constant Current OperationDuring actual CC operation, if a load change causes the voltage limit to be exceeded STORE Storing and Recalling Operating StatesSTORE StoreRECALL DONE5 Turn on the recall mode 7 Restore the operating stateProgramming Overvoltage Protection Setting the OVP Level and Enable the OVP CircuitLEVEL 22.0V E3633A LEVEL 55.0V E3634A OVP ONClearing the Overvoltage Condition Checking OVP OperationCHANGED OVP CLEAROver Voltage Over Voltage Over Voltage Over Voltage OVP CLEARChapter 3 Front-Panel Operation Programming Overvoltage Protection Figure 3-1. Recommended Protection Circuit for Battery ChargingProgramming Overcurrent Protection Setting the OCP Level and Enable the OCP CircuitLEVEL 22.0 A E3633A LEVEL 7.5 A E3634A OCP ONClearing the Overcurrent Condition Checking OCP OperationOCP CLEAR CHANGEDOver Current Over Current Over Current Over Current OCP CLEAROutput Rating CV RegulationOutput Noise Remote Voltage Sensing at the Front and Rear TerminalsRemote Voltage Sensing Connections StabilityRemote Voltage Sensing at the Rear Panel Disabling the Output Knob Locking Disabling the Output Using an External RelaySelf-Test System-Related Operations3 ERR Error ConditionsDisplay the string enclosed in quotes Display ControlSCPI Language Version Firmware Revision QueryChapter 3 Front-Panel Operation System-Related Operations You can query the firmware revision from the remote interface onlyRemote Interface Selection Remote Interface ConfigurationParity Selection RS-232 GPIB AddressBaud Rate Selection RS-232 GPIB To Set the GPIB AddressADDR CHANGE SAVEDRS-232 To Set the Baud Rate and Parity RS-2329600 BAUDCHANGE SAVED I/O ConfigGPIB Interface Configuration RS-232 Data Frame Format RS-232 Interface ConfigurationRS-232 Configuration Overview Connection to a Computer or Terminal DTR / DSR Handshake Protocol RS-232 Troubleshooting Calibration Security Calibration OverviewUNSECURED SECURED000000 CODE 000000 CODE UNSECUREDSECURED Chapter 3 Front-Panel Operation Calibration OverviewUnsecure with old code Change the security codeCalibration Message Calibration CountChapter 3 Front-Panel Operation Calibration Overview CALCOUN?Remote Interface Reference Remote Interface Reference program the power supplySCPI First-time SCPI users, see page SCPI Command SummaryChapter 4 Remote Interface Reference SCPI Command Summary Output Setting and Measurement Commands Chapter 4 Remote Interface Reference SCPI Command Summarynumeric value DEFault numeric valueDEFaultTriggering Commands Chapter 4 Remote Interface Reference SCPI Command SummarySystem-Related Commands INITiateIMMediate TRIGgerSEQuence DELay secondsMINMAX DELay?Calibration Commands Chapter 4 Remote Interface Reference SCPI Command SummaryStatus Reporting Commands CALibration COUNt? CURRentDATA numeric value CURRentLEVel MINMIDMAXRS-232 Interface Commands Chapter 4 Remote Interface Reference SCPI Command SummaryIEEE-488.2 Common Commands SYSTem LOCal REMote RWLockSimplified Programming Overview Using the APPLy CommandUsing the Low-Level Commands Selecting a Trigger Source Reading a Query ResponseTable 4-2. Agilent E3634A Programming Ranges Power Supply Programming RangesTable 4-1. Agilent E3633A Programming Ranges Chapter 4 Remote Interface Reference Using the APPLy Command Using the APPLy CommandAPPLy voltage DEF MIN MAX,current DEF MIN MAX APPLy?Output Setting and Operation Commands This query returns the presently programmed current level of the power supply. CURR? MAX and CURR? MIN return the highest and lowest programmable current levels for the selected range This command sets the current level at which the overcurrent protection OCP circuit will trip. If the peak output current exceeds the OCP level, then the output current is programmed to zero. The Questionable Status register ‘‘OC’’ bit is set see page 103. An overcurrent condition can be cleared with the CURRPROTCLE command after the condition that caused the OCP trip is removed The following program segments show how to use the VOLT UP or VOLTageSTEP numeric valueDEFault Output Setting and Operation CommandsVOLTageSTEP? DEFault Chapter 4 Remote Interface ReferenceThis query returns the overvoltage protection trip level presently programmed. VOLTPROT? MAX and VOLTPROT? MIN return the maximum and minimum programmable overvoltage trip levels This query returns the currently selected range. The returned parameter for the Agilent E3633A is ‘‘P20V’’ HIGH or ‘‘P8V’’ LOW and the parameter for the Agilent E3634A is ‘‘P50V’’ HIGH or ‘‘P25V’’ LOW Trigger Source Choices Triggering CommandsTo select the immediate trigger source, send the following command Triggering Commands Chapter 4 Remote Interface Reference System-Related Commands System-Related CommandsDISPlay OFF ON DISPlay?OUTPREL command Chapter 4 Remote Interface Reference System-Related CommandsSYSTemERRor? +0, ‘‘No error’’This command resets the power supply to its power-on state as follows To recall a stored state, you must use the same memory location used Calibration Commands This command corrects the differential nonlinearity error of the internal DAC without an external meter. You must send this command before calibrating the voltage. It takes about 30 seconds to execute the command This command can only be used after calibration is unsecured and the output state is ON. It sets the power supply to a calibration point that is entered with CALVOLT command. During calibration, three points must be entered and the low-end point MIN must be selected and entered first RS-232 Interface Commands The SCPI Status Registers What is an Event Register?What is an Enable Register? Binary Weight 20 = 21 = 22 = 23 = 24 = 25 = 26 = 27 = 28 = 29 = 210 = SCPI Status SystemChapter 4 Remote Interface Reference The SCPI Status Registers 211 = 212 = 213 = 214 = 215 =The Questionable Status Register Execution Error. An execution error occurred see error The Standard Event RegisterCommand Error. A command syntax error occurred see Power On. Power has been turned off and on since theThe Standard Event Enable register is cleared when The Status Byte RegisterChapter 4 Remote Interface Reference The SCPI Status Registers The Standard Event register is cleared whenUsing Service Request SRQ and Serial POLL To Interrupt Your Bus Controller Using SRQ Using *STB? to Read the Status ByteUsing the Message Available Bit MAV Using *OPC to Signal When Data is in the Output Buffer To Determine When a Command Sequence is CompletedChapter 4 Remote Interface Reference Status Reporting Commands Status Reporting CommandsSYSTemERRor? STATusQUEStionableCONDition?This command clears all event registers and Status Byte register STB? Chapter 4 Remote Interface Reference Status Reporting Commands PSC?SRE? SOURce CURRent currentMINMAXUPDOWN CURRent? MINMAX CURRent An Introduction to the SCPI LanguageTRIGgered currentMINMAX TRIGgered?MINMAX VOLTage voltageMINMAXUPDOWN VOLTage? MINMAX VOLTage TRIGgered voltageMINMAX TRIGgered? MINMAXCommand Format Used in This Manual Using the MIN and MAX Parameters Command SeparatorsIEEE-488.2 Common Commands Querying Parameter SettingsSCPI Command Terminators SCPI Parameter Types Halting an Output in Progress Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Conformance InformationSCPI Confirmed Commands SOURce VOLTageLEVelIMMediateAMPLitude voltageMINMAXUPDOWN SCPI Confirmed Commands continuedChapter 4 Remote Interface Reference SCPI Conformance Information SECureCODE new code SECureSTATe OFFON,code SECureSTATe? APPLy voltageDEFMINMAX,currentDEFMINMAX APPLy?STRing quoted string STRing? OUTPut RELaySTATe OFFON RELaySTATE?IEEE-488 Conformance Information Error Messages Store Error Messages3 ERR Execution Errors A command header was received which contained more than the maximum particular element received was not valid for the header executed due to the current device state data is lost Self-Test Errors Calibration Errors Chapter 5 Error Messages Calibration Errors Application Programs Application Programs This chapter contains two application programs over the remote interface to help you develop programs for your own application. Chapter 4, “Remote Interface Reference,” starting on page 73, lists the syntax for the SCPI Standard Commands for Programmable Instruments commands available to program the power supplyChapter 6 Application Programs Example Program for C and C++ Example Program for C and C++Diode.c Continued on next page 135Continued on next page 136 Chapter 6 Application Programs Example Program for C and C++strcatVISAaddress,GPIBAddress strcatVISAaddress,INSTR Chapter 6 Application Programs Example Program for C and C++Continued on next page 137 if ErrorStatus VISUCCESS printf\n %s,pMessage ClosePort exit0 void CheckErrorchar* pMessagevoid delayclockt wait Chapter 6 Application Programs Example Program for C and C++Chapter 6 Application Programs Example Program for Excel Example Program for ExcelExample program resultTo write an Excel macro you must first open a module in Excel. Go to the View menu, choose Toolbars, and then select Control Toolbox. The Control Toolbox dialog box appears. Select the Command button in the dialog box. Click cell A1 and drag across the cell B3. The “CommandButton1” box is created. To change the button name, click the right mouse button on that button and then select Properties. The Properties dialog box appears. In the Properties dialog, change the “name” and “caption” to “Diode”. To try the example for characterizing a diode, type “Voltages” in cell A4 and “Current” in cell B4. In cell A5 type 0.6. Fill in the cells A5 to A15 in 0.02 increments so that cell A15 contains Continued on next page 141 Chapter 6 Application Programs Example Program for Excel Diode MacroEnd of Program 142 Dim commandString As StringChapter 6 Application Programs Example Program for Excel Declaration for Windows Chapter 6 Application Programs Example Program for ExcelDeclaration for Windows 95/NT This routine requires the file VISA.dll. It typically resides in theChapter 6 Application Programs Example Program for Excel 144 Tutorial Tutorial Output Characteristics, starting on pageFigure 7-1. Diagram of Simple Series Power Supply Overview of Agilent E3633A and Agilent E3634A OperationCONTROL DISPLAY POWER SUPPLY OUTPUTOPTICAL ISOLATION Chapter 7 Tutorial Output Characteristics Output CharacteristicsFigure 7-5. Output Characteristics Unregulated State Unwanted SignalsE3633A E3634A Figure 7-6. Simplified Diagram of Common Mode and Normal ModeSources of Noise Multiple Loads Connecting the LoadOutput Isolation Figure 7-7. Regulated Power Supply with Remote Sensing Remote Voltage SensingLoad Consideration Chapter 7 Tutorial Connecting the Load Reverse Current Loading Parallel Connections Extending the Voltage and Current RangeSeries Connections Figure 7-8. Speed of Response - Programming Up Full Load Remote ProgrammingFigure 7-9. Speed of Response - Programming Down Chapter 7 Tutorial Reliability ReliabilitySpecifications Specifications Table 1-1. Performance Specifications Performance SpecificationsChapter 8 Specifications Performance Specifications OVP and OCP Accuracy, ±% of output + offset Chapter 8 Specifications Supplemental Characteristics Supplemental CharacteristicsTemperature Coefficient, ±% of output + offset Remote Sensing CapabilitySCPI Standard Commands for Programmable Instruments 20 to 70 C for storage environment Chapter 8 Specifications Supplemental Characteristics 168 Index IndexIndex Indexoutput programming range 165 output ratings IndexIndex weight of power supply 167 wire rating wires sizes Index UIndex unregulated state condition 151 up-programming responseCopyright 1998 Agilent Technologies All Rights Reserved according to ISO/IEC Guide 22 and EN DECLARATION OF CONFORMITY