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Lightwave Communications manual LDX-3232 Current Source Command Set, Command Syntax

Models: LDX-3232

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C H A P T E R 3

REMOTE OPERATI ON

LDX-3232 Current Source Command Set

Changing Operation from Local to Remote

Sending a command over the GPIB will automatically put the instrument in REMOTE mode. The REMOTE indicator will identify when the Current Source is in remote operation mode. When the instrument is in REMOTE mode, pressing the LOCAL switch returns the instrument to LOCAL control mode unless the Local Lockout state has been activated by the host computer. Local Lockout disables all LDX-3232 High Compliance Current Source front panel switches until this condition is changed by the host computer. When the instrument is put in Local Lockout Mode by the host computer, the REMOTE indicator will flash at a 1Hz rate to indicate that the front panel is completely disabled by Local Lockout.

The TALK/LISTEN indicator is illuminated when the instrument is communicating over the GPIB bus.

LDX-3232 Current Source Command Set

For the most efficient and effective remote control of your LDX-3232 High Compliance Current Source, we recommend you study the following sections. You will learn about the LDX-3232 command sets, both GPIB-IEEE488 Command Commands and the most used device specific commands, and command syntax. Later in this chapter you will be introduced to the error and status registers.

Command Syntax

Any command or command query must contain all of the letters that are shown in the LDX-3232 Command Path Structure, Figure 3.2. However, the Current Source's command parser is NOT CASE SENSITIVE so upper or lower case may be used in any combination. The lower case letters shown with the Device Dependent commands in Chapter 4 are optional letters and may be used for clarity. For example, the following commands are equal:

•LAS:DIS 1

•LAS:DisP 1

•LAS:DISPLAY 1

In this example, only the first three letters "DIS" are required, while the other letters, "play" are optional. These optional letters must be used in the proper sequence as shown.

22 LDX-3232

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Lightwave Communications LDX-3232 Current Source Command Set, Changing Operation from Local to Remote, Command Syntax

Contents

User’s Guide Page Table of Contents Remote Operation Command Reference Iv LDX-3232 List of Figures Vi LDX-3232 List of Tables Viii LDX-3232 Safety Information and the Manual General Safety ConsiderationsSafety Symbols Safety Marking SymbolsWarranty Claims for Shipping Damage Model Number Serial Number End-User Name Company Phone Fax Comments, Suggestions, and ProblemsDescription of the problem Xiv LDX-3232 Introduction and Specifications Product OverviewInitial Inspection Installing Your LDX-3232 High Compliance Current SourceAC Line Power Requirements Grounding RequirementsGpib Address Gpib ConnectorTilt-Foot Adjustment Operating the LDX-3232 Precision Current SourceLDX-3232 Front View Maintenance Specifications 13 µs 12 ms Type Pulse Width DelayTTL Available Options and Accessories Description Model NumberApplying Power to Your LDX-3232 Power On SequenceConnecting to the Laser Power On StateCommon Laser Cathode Photodiode Anode Back Panel LD Connector Interlock ConnectionsGrounding Considerations Setting the PD BiasPhotodiode Connections Display Operating a Laser in Constant Current I ModeFront Panel Operation Setting Up the Precision Current Source E R a T I O N Operating a Laser in Constant Power P Mode Entering Photodiode Responsivity ValuesMethod to calculate the responsivity is suggested below Error Indicators LDX-3232 Error IndicatorsError Indicators LDX-3232 Reading the Gpib Address Changing the Gpib AddressChanging Operation from Local to Remote LDX-3232 Current Source Command SetCommand Syntax OFF OLD NEW True False SET Reset LASLDI? Command Paths LDX-3232 Command Path StructureIEEE488.2 Command Commands LIM LDX-3232 Frequently Used CommandsNone Operation Complete Definition Status ReportingEvent and Condition Registers LDX-3232 Status Reporting Schematic Diagram Disabled 10 N/A Enabled 11 N/A 12 N/A 13 N/A 14 N/A 15 N/A Output Off RegisterLASerENABleOUTOFF nrf LASerENABleOUTOFF? Command Timing and Completion Error MessagesError Code Classifications Response MessageMode Used to enter the laser current calibration mode Used to create a delay in the execution of furtherCommands Used to enter the laser voltage calibration modeSets the enable register for Laser conditions Returns status of photodiode monitor power displayEnables Laser display to show parameter values Returns the value of the LAS conditions enable registerUsed to enable/disable the front panel modulation input Used to return the optical power from monitorUsed to set the constant optical power setpoint, if Or P optical powerReturns the elapsed time since the timer was last reset Returns the status of the Term commandPowered up Used to return the Laser setpoint tolerance valueLDX-3232 Device-Dependent Commands Command Description FormatLDX-3232 Device-Dependent Command Reference DelayCalmd LAS Calpd ERRors?LASerCALMD Responsivity CAL PD parameter setting Syntax Diagram LASerCALMD?Calibration for that bandwidth Selected. This procedure is outlined in ChapterLASerCALLDI LDI LAS CAL LASerCALLDI?LASerCALLDV LAS CAL LDVLASerCALMDI True measured value. This procedure is outlined in ChapterLASerCALLDV? MDI LASerCALMDI?LASerCOND? LAS CAL IPDLASerDEC LAS DIS LASerDISplayLASerDISplay? LASDIS?Lasdisldi LASerDISplayLDILASerDISplayLDI? LDILASerDISplayLDV? Voltage measurement Syntax DiagramLASerDISplayLDV LASDISLDV?LAS DIS MDI LASerDISplayMDILASerDISplayMDI? LAS DIS IPDPPD LASerDISplayMDPLASerDISplayMDP? LAS DIS MDPLAS DIS Param LASerDISplayPARAMLASerDISplaySET LAS DIS SETLASDISPLAYSET? LASerENABleCONDLASerDISplaySET? LAS Enab Cond LASerENABleCOND?Bit Action enables the Laser status event register so that LASerENABleEVEntAn nrf value whose sum represents the bits that are enabled LasenabeventLASerENABleEVEnt? LAS Enab EVELASerENABleOUTOFF LASerENABleOUTOFF? LAS Enab OutoffLASerEVEnt? LASerENABleEVEnt commandCommand while the condition status is constantly changing LAS EVELASerINC Function for the Laser outputLASerLDI? This measurement is updated approximately once every 600 msLASerLDI LAS LDIFor LDV calibration LASerLDVLASerLDV? LAS LDVLimit in use depends on the Laser output range selection LASerLIMitI2LASerLIMitI2? LAS LIMLASerLIMitI4? Displayed, and then releasing the SET switchLASerLIMitI4 LASLIMI4?MDP LAS LIM LASerLIMitMDPLASerLIMitMDP? LASerLIMitV LASerLIMitV?MDI LAS IPD LASerMDILASerMDI? MDP P PD setpoint would be usedLAS Mdln LASerMDLNLASerMDLN? MDP LAS LASerMDPLASerMDP? LASerMODE? LAS ModeLAS Mode Ihbw LASerMODEIHBWLASerMODEMDP LAS Mode MDPLASerMODEILBW LasmodeilbwLAS OUT LASerOUTputLASerOUTput? LAS RAN LASerRANgeLASerRANge? LASRAN?LASerSETLDI? Where the response is the constant I setpoint value, in mA30 µA, for use in constant P mode with Calpd = LASerSETMDI?LASerSTEP Where the response is the constand PPD setpoint, in mWLASerSETMDP? 100 µALASerTOLerance LASerTOLerance commandLASerSTEP? LAS TOLSecond is the time window, in seconds LASerTOLerance?MESsage MESMESsage? RADixRAD Term 0 command is sent or the LDX-3232 is powered offRADix? Means hexadecimal, and OCT means octalTime LDX-3232 was last powered upTime clock is independent of the Timer clock Last TIMER? query is returned Since the last TIMER? query was issuedTimer Seconds since the last TIMER? query was issuedFunctions and Features Saving and Recalling from the Front PanelUsing the Laser Compliance Voltage Adjustment Saving and Recalling Under Remote OperationUsing the LDX-3232 Current Source’s Trigger Function LDX-3232 Rear PanelModulating the Laser Current Source BNC Interlock Usage ExampleModulating the Laser Current Source Functions and Features Calibration and Troubleshooting Calibration OverviewDMM Description Manufacturer/Model SpecificationRecommended Equipment Range Local Calibration of the LDX-3232 Current SourceCurrent Source Calibration Current LimitIPD Current Calibration Set equal to zero Constant powerCAL PD IPD Setpoint2000 mA Laser ModeLaser Forward Voltage Measurement Calibration Set to FS full scale of rangeLimit Gpib CommandRemote Calibration of the LDX-3232 Current Source Lasldi nrf value command IPD Setpoint Function State Gpib Command EEPROM, Lllll will be displayed on the display the laser Troubleshooting GuideGeneral Current source must be recalibratedFeature can be defeated via the Lasenableoutoff Command101 Response Message