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HP 664xA User's Manual

1. quotes Be certain that your program statements comply with this requirement introduction to SCPI Remote Programming 2 7 EXAMPLES The examples given here are generic without regard to the progaramming language or type of HP IB interface Because SCPI commands are sent as ASCII output strings within the programming language statements the SCPI syntax is independent of both programming language and interface Note The examples are followed by sample program code written for three popular types of BASIC controlled HP IB interfaces Controlling Output important The power supply responds simultaneously to both digital and analog progamming inputs If is receiving an input over the HP IB and a corresponding input from the front panel and or from the analog programming port the power supply output will be the algebraic sum of the inputs Programming Voltage and Current The following statements program both voltage and current and return the actual output from the sense terminals OUTP OFF Disable the output VOLT 4 5 CURR 255 Program the voltage and current VOLT CURR Read back the programmed levels OUTP ON Enable the output MEAS VOLT MEAS CURR Read back the outputs from the sense terminals Programming Protection Circuits This example programs the voltage and current programs an overvoltage protection value and turns on the overcurrent protection It then reads back all the programmed values V
2. 6671A 86672A 6673A 6674A 6675A 225 23 A 102 37 A 61 43 A 35 83 A 18 43 A 6680A 6681A 6682A 6683A 6684A 875 A 580 A 240 A 160 A 128 A RST Current Value 6641A 6642A 6643A 6644A 6645A 0 08 A 0 04 A 0 024 A 0 014 A 0 006 A 6651A 6652A 6653A 6654A 6655A 0 205 A 0 100 A 0 060 A 0 036 A 0 016 A 6671A 6672A 6673A 6674A 6675A 0 88 A 0 40 A 0 24 A 0 14 A 2 07 A 6680A 6681A 6682A 6683A 6684A TITLA 48 75 A 20 26 A 13 51 A 10 79 A OUTP PROT DEL 0 to 32 727 s MAX for all models RST Value _ 200 ms for all models __ VOLT LEV MAX and 6641A 6642A 8643A 6644A 6645A VOLT LEV TRIG MAX 6652A 6653A 6654A 6655A Programming range is 0 to MAX 6672A 6673A 6674A 6675A 20 473 V 35 831 YV 61 425 V 122 85 V 6680A 6681A 6682A 6683A 6684A 5 145 V 8 190 V 21 50 V 32 75 V 41 9 Y V for all models RST Voltage Value VOLT PROT MAX Programming range is to MAX RST OVP value MAX for all models Note For programming accuracy and resolution see the Specifications and Supplemental Characteristics in the Operating Guide 3 26 Language Dictionary Programming Parameters
3. Operation Complete Device Status Description This command causes the interface to set the OPC bit bit 0 of the Standard Event Status register when the power supply has completed ali pending operations See ESE for the bit configuration of the Standard Event Status register Pending operations are complete when w all commands sent before OPC have been executed This includes overlapped commands Most commands are sequential and are completed before the next command is executed Overlapped commands are executed in parallel with other commands Commands that affect output voltage current or state relays and trigger actions are overlapped with subsequent commands sent to the power supply The OPC command provides notification that all overlapped commands have been completed m any change in the output level caused by previous commands has been completed completion of settling time relay bounce etc a all triggered actions are completed OPC does not prevent processing of subsequent commands but Bit 0 will not be set until all pending operations are completed Command Syntax OPC Parameters None Related Commands OPC WAI OPC Meaning and Type Operation Complete Device Status Description This query causes the interface to place an ASCII 1 in the Output Queue when all pending operations are completed Pending operations are as defined for the OPC command Unlike OPC OPC prevents processing of all subsequen
4. OPER event to report i215 CODES STATUS OPER EVEN GOSUB 2000 Query status oper register 1220 CALL IOENTER PS OEVENT Read back event bit 1225 IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR IF OEVENT AND 1024 1024 THEN PRINT Supply switched to CC mode Programming Some Power Supply Functions 2 14 Remote Programming Sample Program 1240 Clear the status circuit 1245 CODES CLS GOSUB 2000 1250 FOR I 1 TO 100 NEXT I Wait for supply to clear 1255 1260 Disable output and save present state in location 2 1265 CODES OUTPUT OFF SAV 2 GOSUB 2000 1270 END 1275 2000 Send command to power supply 2005 LENGTH LEN CODES 2010 CALL IOOUTPUTS PS CODES LENGTH Send command to interface 2015 IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR SETUP BAS error trap 2020 RETURN 2025 3000 Get data from power supply 3005 CALL IOENTERA PS OUTPUTS 1 MAX ELEMENTS ACTUAL ELEMENTS 3010 IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR 3015 RETURN ak ae a ae eae ee ae oe aie ak ae ae ae ee a oe ak af oe ae ak eae ae ae ae Oe eo ae a a ke ei oe ye he a ee eh he se fe hee he ee ae ae ae he ae ke a ae ae ae ah ak ok ok a kK fe IBM Controller Using National Interface Whe He a oe shee we ae ae ae ae ee oe ie he a ee ae ee ae a ae oe e ae a ae oe abe ee ae ae ahah fe ae it oie he ae aie ae ee ae ae eae oe ae fe ee it Re oe ae a 9 Oe ok oe a a ke 990 Merge DECL BAS here 1000 Power Sup
5. STAT PRES STATUS PRESET Query Syntax None Related Commands None Status Questionable Registers The bit configuration of all Status Questionable registers is as follows Bit Configuration of Questionable Registers Bit 15 ra KA 1 Bit Name NU UNR E a AAE EAA NU Not used OC Overcurrent protection circuit has tripped OT Overtemperature status condition exists OV Overvoltage protection circuit has tripped RI Remote inhibit is active UNR Power supply output is unregulated Note See Chapter 4 Status Reporting for more explanation of these registers STAT QUES This query returns the value of the Questionable Event register The Event register is a read only register which holds latches all events that are passed by the Questionable NTR and or PTR filter Reading the Questionable Event register clears it Query Syntax STATus QUEStionable sEVENt Parameters None Returned Parameters lt NR1 gt Register Value Examples STAT QUES STATUS QUESTIONABLE EVENT Related Commands CLS STAT QUES ENAB STAT QUES NTR STAT QUES PTR Subsystem Commands Language Dictionary 3 19 STAT QUES COND STAT QUES COND STAT QUES ENAB STAT QUES NTR PTR This query returns the value of the Questionable Condition register That is a read only register which holds the real time unlatched questionable status of the power supply Query Syntax Parameters Examples Returned Paramet
6. Value Examples DISP TEXT DEFAULT_MODE DISPLAY WINDOW TEXT DATA 533 2E 1VOLTS Query Syntax DISPlay WINDow TEXT Returned Parameters lt STR gt Last programmed text string Related Commands DISP DISP MODE RST Note IEEE Standard Digital Interface for Programmable Instrumentation requires that a string be enclosed in either single or double quotes initiate Subsystem This subsystem enables the trigger system When a trigger is enabled an event on a selected trigger source causes the specified trigging acition to occur If the trigger subsystem is not enabled all trigger commands are ignored If INIT CONT is OFF then INIT enables the trigger subsystem only for a single trigger action The subsystem must be enabled prior to each subsequent trigger action If INIT CONT is ON then the trigger subsystem is continuously enabled and INIT is redundant 3 14 Language Dictionary Subsystem Commands INIT Command Syntax Parameters RST Value Examples Query Syntax Returned Parameters Related Commands MEAS OUTP INITiate IM Mediate INITiate CONTinuous lt beol gt For INIT IMM _ None For INIT CONT 0 1 OFF ON OFF INIT INITIATE IMMEDIATE INIT CONT i INITIATE CONTINUOUS i For INIT IMM None For INIT CONT INIT CONT lt NRI gt O ABOR lt GET gt RST TRIG TRG Measure Subsystem This query subsystem returns the voltage and current measured at the power supply s sense terminal
7. a write cycle to nonvolatile memory The nonvolatile memory has a finite maximum number of write cycles see Supplemental Characteristics in Chapter 1 of the power supply Operating Guide Programs that repeatedly cause write cycles to nonvolatile memory can eventually exceed the maximum number of write cycles and may cause the memory to fail ESR Meaning and Type Event Status Register Device Status Description This query reads the Standard Event Status Event register Reading the register clears it The bit configuration of this register is the same as the Standard Event Status Enable register ESE See Chapter 4 Status Reporting for a detailed explanation of this register Query Syntax ESR Parameters None Returned Parameters lt NRi gt Register binary value Related Commands CLS ESE ESE OPC IDN Identification Query Meaning and Type Identification System Interface Description This query requests the power supply to identify itself It returns a string composed of four fields separated by commas Query Syntax IDN Returned Parameters lt AARD gt Field Information Hewlett Packard Manufacturer zorrtA 4 digit model number followed by a letter suffix NNNNA NNNNN 10 character serial number or lt R gt 2v 27 Revision levels of firmware Example HEWLETT PACKARD 6681 0 A 00 01 Related Commands None 3 4 Language Dictionary Common Commands OPC ESR OPC OPC Meaning and Type
8. consent of Hewlett Packard Company The information contained in this document is subject to change without notice INTRODUCTION ABOUT THIS GUIDE This guide provides remote programming information for the following series of HP IB programmable power supplies e HP 664xA e HP 665xA eHP 667xA eHP 668xA You will find the following information in the rest of this guide Chapter 2 Introduction to SCPI messages structure syntax and data formats Examples of SCPI programs Chapter 3 Dictionary of SCPI commands Table of programming parameters Chapter 4 Description of the status registers Chapter 5 Error messages Appendix A SCPI conformance information Appendix B Use of the alternate Compatibility programming language DOCUMENTATION SUMMARY User s Guide The Operating Guide shipped with the power supply has information helpful to programming the power supply and explains the SCPI commands used for remote calibration Sample calibration and verification programs are included External Documents SCPI References The following document will assist you with programming in SCPI a Beginner s Guide to SCPI HP Part No H2325 90001 o Highly recommended for anyone who has not had previous experience programming with SCPI or TMSL HP IB References For a basic introduction to the HP IB see the following a Tutorial Description of the Hewlett Packard Interface Bus HP Part No 5952 0156 o Highly recommended for thos
9. contacts during switching If the power supply is not configured for the relay option sending either relay command generates an error Command Syntax OUTPut RELay STATe lt bool gt Parameters 0 1 OFF ON RST Value 0 Examples OUTP REL 1 OUTP REL OFF Query Syntax OUTPput RELay Returned Parameters 0 1 Related Commands OUTP STAT RCL SAV OUTP REL POL Caution Do not install or program the HP Relay Accessories if the power supply maximum output current rating see Table 3 1 exceeds the contact ratings of the relay This command is valid only if the power supply is configured for the optional relay connector Programming NORMal causes the relay output polarity to be the same as the power supply output Programming REVerse causes the relay output polarity to be opposite to that of the power supply output If OUTP STAT ON when either relay command is sent the power supply output voltage is set to 0 during the time that the relays are changing polarity 3 16 Language Dictionary Subsystem Commands OUTP REL POL Status Subsystem STAT OPER If the power supply is not configured for the relay option sending either relay command generates an error Command Syntax OUTPut RELay POLarity lt CRD gt Parameters NORMal REVerse RST Value NORM Examples OUTP REL POL NORM Query Syntax OUTPput RELay POLarity Returned Parameters NORM REV Related Commands OUTP STAT RCL SAV Status Subsystem This subsystem programs the power su
10. interrupt caused by change to CC mode and print to screen 1180 SPOL 0 1185 CALL IBRSP PS SPOL 1190 IF SPOL AND 128 128 THEN POLL 1 Set interrupt flag on OPER bit 1195 IF POLL lt gt 1 THEN GOTO 1230 No interrupt to service 1200 CODES STAT OPER EVEN GOSUB 2000 Query status oper register 1205 CALL IBRD PS OEVENTS Read back event bit 1210 IF IBSTA lt O THEN GOTO 2100 1215 OEVENT VAL OEVENTS 1220 IF QEVENT AND 1024 1024 THEN PRINT Supply switched to CC mode 1225 1230 Clear status circuit 1235 CODES CLS GOSUB 2000 1240 FOR I 1 TO 50 NEXT I Wait for supply to clear 1245 1250 Disable output and save present state to location 2 1255 CODES OUTPUT OFF SAV 2 GOSUB 2000 1260 END 1265 2000 Send command to power supply 2005 CALL IBWRT PS Z CODES 2010 IF IBSTATZ lt O THEN GOTO 2100 Error detected 2015 RETURN 1250 Disable output and save present state to location 2 1255 CODES OUTPUT OFF SAV 2 GOSUB 2000 1260 END 1265 2000 Send command to power supply 2005 CALL IBWRT PS CODES 2010 IF IBSTATA lt 0 THEN GOTO 2100 Error detected 2015 RETURN 2020 2100 Error detection routine 2105 PRINT GPIB error IBSTAT amp H HEX IBSTATYZ 2110 PRINT IBERR IBERR in line ERL 2115 STOP 12120 3000 Get data from power supply 3005 CALL IBRD PS OUTPUTS 3010 IF IBSTA lt 0 THEN GOTO 2100 3015 I i Parse data string 3020 X 3025 C INS
11. process When the controller conducts a serial poll in response to SRQ the RQS bit is cleared but the MSS bit is not When SRE is cleared by programming it with 0 the power supply cannot generate an SRQ to the controller 3 8 Language Dictionary Common Commands SRE STB Command Syntax SRE lt NRf gt Parameters 0 to 255 Default Value See PSC Example SRE 20 Query Syntax SRE Returned Paramters lt NR1 gt Register binary value Related Commands ESE ESR PSC Caution If PSC is programmed to 0 then the SRE command causes a write cycle to nonvolatile memory The nonvolatile memory has a finite number of write cycles see Supplemental Characteristics in the power supply Operating Guide Programs that repeatedly write to nonvolatile memory can eventually exceed the maximum number of write cycles and may cause the memory to fail STB Meaning and Type Status Byte Device Status Description This query reads the Status Byte register which contains the status summary bits and the Output Queue MAV bit Reading the Status Byte register does not clear it The input summary bits are cleared when the appropriate event registers are read see Chapter 4 Status Reporting for more information The MAV bit is cleared at power on or by CLS A serial poll also returns the value of the Status Byte register except that bit 6 returns Request for Service RQS instead of Master Status Summary MSS A serial pol
12. the value of the Operation Condition register That is a read only register which holds the real time unlatched operational status of the power supply Query Syntax STATus OPERation CONDition Parameters None Examples STAT OPER COND STATUS OPERATION CONDITION Returned Parameters lt NR1 gt Register value Related Commands None STAT OPER ENAB This command and its query set and read the value of the Operational Enable register This register is a mask for enabling specific bits from the Operation Event register to set the operation summary bit OPER of the Status Byte register This bit bit 7 is the logical OR of all the Operatonal Event register bits that are enabled by the Status Operation Enable register Command Syntax STATus OPERation ENABle lt NRf gt Parameters 0 to 32727 Suffix None Default Value 0 Examples STAT OPER ENAB 1312 STAT OPER ENWAB 1 STATUS OPERATION ENABLE Query Syntax STATus OPERation ENABle Returned Parameters lt NR1 gt Register value Related Commands STAT OPER EVEN STAT OPER NTR PTR Commands These commands set or read the value of the Operation NTR Negative Transition and PTR Positive Transistion registers These registers serve as polarity filters between the Operation Enable and Operation Event registers to cause the following actions a When a bit in the Operation NTR register is set to 1 then a 1 to 0 transition of the corresponding bit in the Operation Condition register causes tha
13. Description This command instructs the power supply not to process any further commands until all pending operations are completed Pending operations are as defined under the OPC command WAI can be aborted only by sending the power supply an HP IB DCL Device Clear command Command Syntax WAI Parameters None Query Syntax None Related Commands OPC OPC DESCRIPTION OF SUBSYSTEM COMMANDS Figure 3 2 is a tree diagram of the subsystem commands Commands followed by a question mark take only the query form Except as noted in the syntax descriptions all other commands take both the command and query form The commands are listed in alphabetical order and the commands within each subsystem are grouped alphabetically under the subsystem 3 10 Language Dictionary Common Commands Tree Diagram ABOR EE eee ABORI MEASure CURRent mmm EDC CALibrate Note 4 i VOL ee H i i MODE PROTection p m CLEar TEXT EDATA Lu DELAY RELay STATe POLarity DISPlay WIN Dow 7 STAT OUTPut STATE INITiate f IMMediate LsCONTinuous ESOURCe TiCURRent mr ELEVel r i MMediate AMPLitudel i TRIGgered AMPLitude PROTectlon STATe STATus OPERation LEVEN CONDition DATA maa VA LUO i ENABle H i INTRansitilon VOLTage ELEVel ee LAMPLitudel PTRansition TRIGgered EAMPLiude pe PRE Set PROTection LEVe
14. H decimal 10 or hex 0A a end or identify lt END gt a both of the above lt NL gt lt END gt In the examples of this manual there is an assumed message terminator at the end of each message If the terminator needs to be shown it is indicated as lt NL gt regardless of the actual terminator character Traversing the Command Tree Figure 2 2 shows a portion of the subsystem command tree you can see the complete tree in Figure 3 2 Note the location of the ROOT node at the top of the tree The SCPI interface is at this location when the power supply is powered on a a device clear DCL is sent to the power supply 2 4 Remote Programming introduction to SCPI ROOT TRIGger IMMediate a SOURce STATUS OPERation LEVEN PRESet CONDition QUEStionable ENABie NTRansition PTRansition Figure 2 2 Partial Command Tree a the interface encounters a message terminator m the interface encounters a root specifier Active Header Path In order to properly traverse the command tree you must understand the concept of the active header path When the power supply is turned on or under any of the other conditions listed above the active path is at the root That means the interface is ready to accept any command at the root level such as TRIGger or STATus in Figure 2 2 Note that you do not have to preceed either command with a colon there is an implied colon in front of every root level command If yo
15. OLT LEV 4 5 PROT 4 75 Program the voltage and overvoltage protection CURR LEV 255 PROT STAT ON Program the current and overcurrent protection VOLT LEV PROT CURR LEV PROT STAT Read back the programmed values Note the required use of the optional LEVel header in the above example see The Effect of Optional Headers given previously Changing Outputs by Trigger If you do not program pending triggered levels they default to the programmed immediate output levels The following statements shows some basic trigger commands OUTP OFF Disable the output VOLT LEV IMM 2 2 TRIG 2 5 Program the immediate voltage level to 2 2 V and the pending triggered level to 2 5 V CURR LEV IMM 150 TRIG 250 Program the immediate current level to 150 A and the pending triggered level to 250 A 2 8 Remote Programming VOLT LEV IMM TRIG CURR LEV IMM TRIG Check all the programmed values QUTP ON Enable the output MEAS VOLT CURR Read back the immediate levels from the sense terminals INTIT TRIG Arm the trigger circuit and send a single trigger INIT TRG Same as above except using a common command MEAS VOLT CURR Read back the triggered levels from the sense terminals If you need to send two or more triggers program the trigger circuit for continuous arming OUTP OFF Disable the output VOLT LEV IMM 5 0 TRIG 2 5 Program the immediate voltage level to 5 V and the pending triggered level
16. Parameters BUS RST Value BUS Examples TRIG SOUR BUS TRIGGER SOURCE BUS Query Syntax TRIGger SOURce Returned Parameters BUS Related Commands RST TRG TRIG IMM Voltage Subsystem This subsystem programs the output voltage of the power supply VOLT VOLT TRIG These commands set the immediate voltage level or the pending triggered voltage level of the power supply The immediate level is the voltage programmed for the output terminals The pending triggered level is a stored voltage value that is transferred to the output terminals when a trigger occurs A pending triggered level is unaffected by subsequent VOLT commands and remains in effect until the trigger subsystem receives a trigger or an ABORt command is given If there is no pending VOLT TRIG level then the query form returns the VOLT level In order for VOLT TRIG to be executed the trigger subsystem must be initiated see INITiate 3 22 Language Dictionary Subsystem Commands VOLT Command Syntax Parameters Default Suffix RST Value Examples Query Syntax Returned Parameters Related Commands VOLT PROT VOLT TRIG VOLT PROT SOU Rce VOLTage LEVel IM Mediate AMPLitude lt NRf gt SOURce VOLTage LEVel TRIGgered AMPLitude lt NRf gt Table 3 1 V Tabie 3 1 VOLT 200 MA VOLTAGE LEVEL 200 MA VOLTAGE LEVEL IMMEDIATE AMPLITUDE 2 5 VOLT TRIG 20 VOLTAGE LEVEL TRIGGERED 20 SOURce VOLTage LE Vel 1M Mediate A MP Litude SOU
17. Programming Guide HP IB DC Power Supplies Series 664xA 665xA 667xA and 668xA HP Part No 5960 5597 HEWLETT PACKARD Microfiche Part No 5960 5598 Printed in USA November 1993 SAFETY GUIDELINES The beginning of the power supply Operating Manual has a Safety Summary page Be sure you are familiar with the information on that page before programming the power supply for operation from a controller Warning ENERGY HAZARD Power supplies with high output currents such as the Series 668xA can provide more than 240 VA at more than 2 Y If the output connections touch severe arcing may occur resulting in burns ignition or welding of parts Take proper precautions before remotely programming the output circuits PRINTING HISTORY The edition and current revision of this guide are indicated below Reprints of this guide containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to the guide occurring between revisions are covered by change sheets shipped with the guide Edition 1 November 1993 Copyright 1993 Hewlett Packard Company This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior
18. Ree VOLTage LE Vel IM Mediate AMPLitude MAX SOURce VOLTage LEVel IM Mediate AMPLitude MIN SOURce VOLTage LEVel TR1IGgered AMPLitude SOU Rce VOLTage LEVel TRIGgered AMPLitude MAX SOURce VOLTage LEVel TRIGgered AMPLitude MIN lt NR3 gt VOLT and VOLT TRIG return presently programmed immediate and triggered levels If not triggered level is programmed both returned values are the same VOLT MAX and VOLT MIN return the maximum and minimum programmable immediate voltage levels VOLT TRIG MAX and VOLT TRIG MIN return the maximum and minimum programmable triggered voltage levels For VOLT SAV RCL RST For VOLT TRIG ABOR VOLT RST This command sets the overvoltage protection OVP level of the power supply If the output voltage exceeds the OVP level then the power supply output is disabled and the Questionable Condition status register OV bit is set see Chapter 4 Status Reporting An overvoltage condition can be cleared with the OUTP PROT CLE command after the condition that caused the OVP trip is removed The OVP always trips with zero delay and is unaffected by the OUTP PROT DEL command Command Syntax Alternate Syntaz Parameters Default Suffix RST Value Examples Query Syntax Returned Parameters Related Commands Available Subsystem Commands SOURce VOLTage PROTection LEVel lt NRf gt SOURce VOLTage PROTection AMPLitude lt NRf gt Table 3 1 y MA
19. TR I OUTPUTS 3030 WHILE C lt gt 0 3035 D MID OUTPUTS I C I 3040 OUTPUT X VAL D Get values 3045 C i 3050 C INSTR I OUTPUTS 3055 Kk K i 3060 WEND Programming Some Power Supply Functions continued 2 16 Remote Programming Sample Program Code 3065 D RIGHT OUTPUTS LEN OUTPUT I 1 3070 OUTPUT X VAL D 3075 OUTPUT SPACE 40 Clear string 3080 RETURN PSC TTS LCCSCCSL SESE LCL ELS L EL OLS LCT CL SLL CSL CLL SPC LCL LS LCL CS eS CLL SLT LS LL St Sf Controller Using HP BASIC TCT ESP T PL CCTCL SSCL LLL CPPS SCL T Le Le Ter ICEL errerL rere rer errr seri pert rs 3 1000 Power supply at stand alone address 706 1005 OPTION BASE i 1010 DIM Codes 80 Response 80 Mode 32 1015 1020 Program power supply to CV mode with following voltage and current 1025 OUTPUT 706 VOLTAGE 7 8 CURRENT 480 1030 1035 Query power supply outputs and print to screen 1040 OUTPUT 706 MEASURE VOLTAGE CURRENT Query output levels 1045 ENTER 706 Vout Iout 1050 PRINT The output levels are Vout Volts and Iout Amps 1055 1060 Program current triggered level to a value insufficient to maintain 1065 supply within its CV operating characteristic 1070 OUTPUT 706 CURR TRIG 50 1075 1080 S t operation status mask to detect mode change from CV to CC 1085 OUTPUT 706 STAT OPER ENAB 1280 PTR 1280 1090 1095 Enable Status Byte OPER summary bit j 1100 OUTPUT 706 SRE 128 1105 1110 Arm trigg
20. X VOLT PROT 21 5 VOLT PROT LEV MAX VOLTAGE PROTECTION LEVEL 145E 1 SOURce VOLTage P ROTection LEVel SOURce VOLTage PROTection LEVel MIN SOURce VOLTage PROTection LEVel MAX lt NR3 gt VOLT PROT returns presently programmed OVP level VOLT PROT MAX and VOLT PROT MIN return the maximum and minimum programmable OVP levels OUTP PROT CLE RST SAV RCL to accommodate earlier power supply programs Language Dictionary 3 23 COMMAND SUMMARY This summary lists all power supply subsystem commands in alphabetical order followed by all common commands in alphabetical order See Table 3 1 for the command parameters accepted by each power supply model Command Summary Subsystem Commands CURR LEV WIND MODE WIND MODE WIND STAT DISP DISP DISP DISP INIT IMM INIT CONT INIT CONT LEY LEV IMM AMPI CURR LEV IMM AMPL TRIG AMPI NORM TEXT WIND TEXT DATA WIND TEXT DATA DISP WIND STAT See Appendix A in the Operating Manual lt NRf gt suffix none MIN MAX lt NRf gt suffix LEV TRIG AMPL none MIN MAX MEAS CURR DC none MEAS VOLT DC none OUTP STAT OUTP STAT OUTP PROT CLE OUTP PROT DEL OUTP PROT DEL OUTP REL STAT OUTP REL STAT OUTP REL POL OUTP REL POL 3 24 Language Dictionary 0 to 32 767 MIN MAX none MIN MAX 0 1 20FF ON Command Summary Command Summary con
21. ables or disables the power supply overcurrent protection OCP function If the overcurrent protection function is enabled and the power supply goes into constant current operation then the output is disabled and the Questionable Condition status register OC bit is set see Chapter 4 Status Reporting An overcurrent condition can be cleared with the OUTP PROT CLE command after the cause of the condition is removed Command Syntax SOURce CURRent PROTection STATe lt bool gt Parameters 0 1 OFF ON RST Value OFF Examples CURR PROT STAT 0 CURRENT PROTECTION STATE OFF CURR PROT STAT 1 CURRENT PROTECTION STATE ON Query Syntax SOURce CURRent PROTection STATe Returned Parameters lt NRI gt forl Related Commands OUTP PROT CLE RST 3 12 Language Dictionary Subsystem Commands DIG DATA DISP DISP MODE DIG DATA This command sets and reads the power supply digital control port when that port is configured for Digital I O operation Configuring of the port is done via an internal jumper see Appendix D in the Operating Guide The port has three signal pins and a digital ground pin Pins 1 and 2 are output pins controlled by bits 0 and 1 Pin 3 is controlled by bit 3 and can be programmed to serve either as an input or an output Pin 4 is the digital ground Bit position 2 normally serves as an output To change it to an input it must first be programmed high The DIG DATA query returns the last programmed value in bits 0 and 1 a
22. at Subsystem Commands Language Dictionary 3 13 DISP MODE DISP TEXT initiate Subsystem Command Syntax DISPlay WIN Dow MODE NORMal TEXT Parameters lt CRD gt NORMal TEXT RST Value NORM Examples DISP MODE NORM DISPLAY MODE NORMAL DISPLAY WINDOW MODE TEXT Query Syntax DISPlay WIN Dow MODE Returned Parameters lt CRD gt NORMAL or TEXT Related Commands DISP DISP TEXT RST DISP TEXT Allows character strings to be sent to display The characters will be displayed when the display mode is TEXT The LCD has the following character set LCD Character Set uppercase letters A through Z Case sensitive entry digits 0 through 9 punctuation Peel ia ea ae a ae ee blank space A display is capable of showing up to 12 characters However the three punctuation characters do not count toward the 12 character limit when they are preceeded by an alphanumeric character When punctuation characters are included then the maximum number of characters alphanumeric punctuation that can be displayed is 15 If it exceeds the display capacity a message will be truncated to fit and no error message will be generated If any character in the message is not a member of the above character set the character will not be rejected but will be displayed as a starburst all 16 segments of the character will light Command Syntax DISPlay WINDow TEXT DATA lt STR gt Parameters See LCD character set RST
23. ccumulated than the queue can hold the last error in the queue will be 350 T00 MANY ERRORS see Table 5 1 in Chapter 5 Error Messages for other error codes You can use the power supply front panel key to read errors from the queue Errors generated at the front panel are not put into the queue but appear immediately on the display Query Syntax Parameters Returned Parameters Examples Related Commands SYST LANG SYSTem ERRor None lt NR1 gt lt SRD gt SYST ERR SYSTEM ERROR None This command switches the interface between its SCPI TMSL command language and its compatibility language The compatability language is provided for emulation of older power supply systems and is described in Appendix B Sending the command causes s The alternate language to become active and to be stored in nonvolatile memory a The power supply to reset to the state stored in Location 0 If the power supply is shut off it will resume operation in the last selected language when power is restored Command Syntax Parameters Default Value Examples Query Syntax Returned Paramters Related Commands SYST VERS SYSTem LAN Guage lt string gt Syntax is the same regardless of the present language TMSL COMPatibility Note Parameter TMSL must be used in place of SCPI TMSL or last selected language SYST LANG TMSL SYSTEM LANGUAGE COMPATIBILITY SYSTem LAN Guage lt CRD gt TMSL COMP None This query retur
24. colon VOLT PROT OUTPut PROTection CLEar Optional Headers The use of some headers is optional Optional headers are shown in brackets such as OUTPut STATe ON However if you combine two or more message units into a compound message you may need to enter the optional header This is explained under Traversing the Command Tree Query Indicator Following a header with a question mark turns it into a query VOLT VOLT PROT If a query contains a parameter place the query indicator at the end of the last header VOLT PROT MAX Message Unit Separator When two or more message units are combined into a compound message separate the units with a semicolon STATus OP ERation QUEStionable important You can combine message units only at the current path of the command tree see Traversing the Command Tree Root Specifier When it precedes the first header of a message unit the colon becomes a root specifier This indicates that the command path is at the root or top node of the command tree Note the difference between root specifiers and header separators in the following examples OUTP PROT DEL 1 All colons are header separators OUTP PROT DEL 1 The first colon is a root specifier OUTP PROT DEL 1 VOLT 12 5 The third colon is a root specifier Message Terminator A terminator informs SCPI that it has reached the end of a message Three permitted messages terminators are newline lt NL gt which is ASC
25. d decimal point assumed at the right of the least significant digit Examples 273 0273 Digits with an explicit decimal point Example 273 0273 Digits with an explicit decimal point and an exponent Example 2 73E 2 273 0E 2 Listening Formats Extended format that includes lt NR1I gt lt NR2 gt and lt NR3 gt Examples 273 273 2 73E2 Expanded decimal format that includes lt NRf gt MIN and MAX Examples 273 273 2 73E2 MAX MIN and MAX are the minimum and maximum limit values that are implicit in the range specification for the parameter Table 2 2 Suffixes and Multipliers Unit with Multiplier Current Ampere MA milliampere Amplitude Volt MV millivolt Time second MS millisecond Common Multipliers 1E3 K 1E 3 M LE 6 U Boolean Data Either form 1 0 or ON OFF may be sent with commands Queries always return 1 or 0 OUTPut OFF CURRent PROTection 1 Character Data For query statements character strings may be returned in either of the forms shown in Table 2 3 depending on the length of the returned string Table 2 3 Character Data Formats lt CRD gt Character Response Data Permits the return of character strings lt AARD gt Arbitrary ASCII Response Data Permits the return of undelimited 7 bit ASCII This data type has an implied message terminator Note The IEEE 488 2 format for a string parameter requires that the string be enclosed within either single or double
26. e corresponding bit in the Questionable Condition register causes that bit in the Questionable Event register to be set s If the same bits in both NTR and PTR registers are set to 1 then any transition of that bit at the Questionable Condition register sets the corresponding bit in the Questionable Event register w If the same bits in both NTR and PTR registers are set to 0 then no transition of that bit at the Questionable Condition register can set the corresponding bit in the Questionable Event register Note Setting a bit in the PTR or NTR filter can of itself generate positive or negative events in the corresponding Questionable Event register 3 20 Language Dictionary Subsystem Commands STAT QUES NTR PTR SYST ERR SYS LANG STATus QUEStionable NTRansition lt NRf gt STATus QU EStionable PTRansition lt NRf gt Parameters G to 32727 Suffix None Default Value 0 Examples STAT QUES NTR 16 STATUS QUESTIONABLE PTR 512 Query Syntax STAT QUES NTR STAT QUES PTR Returned Parameters lt NR1 gt Register value Related Commands STAT QUES ENAB SYST VERS Command Syntax SYST ERR This query returns the next error number followed by its corresponding error message string from the remote programming error queue The queue is a FIFO first in first out buffer that stores errors as they occur As it is read each error is removed from the queue When all errors have been read the query returns 0 NO ERROR If more errors are a
27. e indicator Terminators are not part of the SCPI syntax Parts of a SCPI Message Headers Headers which are sometimes known as keywords are instructions recognized by the power supply interface Headers may be either in the long form or the short form Long Form The header is completely spelled out such as VOLTAGE STATUS DELAY Short Form The header has only the first three or four letters such as VOLT STAT DEL Short form headers are constructed according to the following rules s If the header consists of four or fewer letters use all the letters DFI DATA a If the header consists of five or more letters and the fourth letter is not a vowel a e i 0 u use the first four letters VOLTage STATus m If the header consists of five or more letters and the fourth letter is a vowel a e i o u use the first three letters DELay CLEar You must follow the above rules when entering headers Creating an arbitrary form such as QUEST for QUESTIONABLE will result in an error The SCPI interface is not sensitive to case It will recognize any case mixture such as VOLTAGE Voltage Volt volt introduction to SCPI Remote Programming 2 3 Note Shortform headers result in faster program execution Header Convention In this manual headers are emphazized with boldface type The proper short form is shown in upper case letters such as DELay Header Separator If a command has more than one header you must separate them with a
28. e message units ending in a message terminator The terminator is not part of the syntax but implicit in the way your programming language indicates the end of a line such as a newline or end of line character The Message Unit The simplest SCPI command is a single message unit consisting of a command header or keyword followed by a message terminator ABOR VOLT The message unit may include a parameter after the header The parameter usually is numeric but it can be a string VOLT 20 VOLT MAX Combining Message Units The following command message see Figure 2 1 is briefly described here with more details in subsequent paragraphs VOLT LEV 4 5 PROT 4 8 CURR lt NL gt 2 2 Remote Programming Introduction to SCP tad Data Message Unit Keywords Query Indicator yoy y y YVOLT LEV mai PROT 4 8 CURR lt NL gt A Keyword Separator i jea Terminator Root Specifier FI CEL GAL Message Unit Separators Figure 2 1 Command Message Structure The basic parts of the message in Figure 2 1 are Message Component Example Headers VOLT LEV PROT CURR Header Separator The colon in VOLT LEV Data 4 5 4 8 Data Separator The space in VOLT 4 5 and in PROT 4 8 Message Units VOLT LEV 4 5 PROT 4 8 CURR Message Unit Separator The semicolons in VOLT LEV 4 5 and PROT 4 8 Root Specifier The colon in PROT 4 8 CURR Query Indicator The question mark in CURR Message Terminator The lt NL gt newlin
29. e not familiar with the IEEE 488 1 and 488 2 standards 1To obtain a copy contact your local HP Sales and Support Office introduction 1 1 The most important HP IB documents are your controller programming manuals HP BASIC HP IB Command Library for MS DOS etc Refer to these for all non SCPI commands e g Local Lockout The following are two forma documents concerning the HP IB interface 2ANSI IEEE Std 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation This defines the technical details of the HP IB interface While much of the information is beyond the need of most programmers it can serve to clarify terms used in this guide and in related documents ANSI IEEE Std 488 2 1987 IEEE Standard Codes Formats Protocols and Common Commands Recommended as a reference only if you intend to do fairly sophisticated programming It is helpful for finding the precise definitions of certain types of SCPI message formats data types or common commands Available from the IEEE Institute of Electrical and Electronics Engineers 345 East 47th Street New York NY 10017 USA PREREQUISITES FOR USING THIS GUIDE The organization of this guide assumes that you know or can learn the following information 1 2 3 How program in your controller language HP BASIC QUICKBASIC C etc The basics of the HP IB IEEE 488 How to program I O statements for an IEEE 488 bus instrument From a programming a
30. econds 1045 IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR 1050 CALL IOCLEAR ISC Clear the interface 1055 IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR 1060 CALL IOREMOTE ISC Set Power Supply to remote mode IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR 1075 Program power supply to CV mode with following voltage and current 1080 CODES VOLTAGE 7 8 CURRENT 480 GOSUB 2000 1085 gt 1090 Query power supply outputs amp print to screen 1095 CODES MEASURE VOLTAGE CURRENT GOSUB 2000 GOSUB 3000 1100 VOUT OUTPUTS 1 1105 IOUT OUTPUTS 2 1110 PRINT The output levels are VOUT Volts and IOUT Amps 1115 1120 Program triggered current level to value insufficient to maintain 1125 supply within its CV operating characteristic 1130 CODES CURR TRIG 50 GOSUB 2000 1135 1140 Set operation status mask to detect mode change from CV to CC 1145 CODES STAT OPER ENAB 1024 PTR 1024 GOSUB 2000 1150 1155 Enable Status Byte OPER summary bit 1160 CODES SRE 128 GOSUB 2000 1165 1170 Arm trigger circuit and send trigger to power supply 1175 CODES INITIATE TRIGGER GOSUB 2000 1180 1185 Wait for supply to respond to trigger FOR T 1 to 100 NEXT I 3 1200 Poll for interrupt caused by change to CC mode and print to screen 1205 CALL IOSPOLL PS RESPONSE 1210 IF RESPONSE AND 128 lt gt 128 THEN GOTO 1240 No
31. ed to their last state prior to power turn on This is the most common application for PSC and enables the power supply to generate an SRQ Request for Service at power on Command Syntax PSC lt bool gt Parameters O LJOFFION Example PSC O PSC 1 Query Syntax PSC Returned Parameters lt NR1 gt o i Related Commands ESE SRE Caution PSC causes a write cycle to nonvolatile memory If PSC is programmed to 0 then the ESE and SRE commands also cause a write cycle to nonvolatile memory The nonvolatile memory has a finite number of write cycles see Table 1 2 Supplementary Characteristics Programs that repeatedly write to nonvolatile memory can eventually exceed the maximum number of write cycles and may cause the memory to fail RCL Meaning and Type Recall Device State Warning Recalling a previously stored state may place hazardous voltage at the power supply output Description This command restores the power supply to a state that was previously stored in memory with the SAV command to the specified location The following states are recalled 3 6 Language Dictionary Common Commands RCL RST CURR LEV 1MM OUTP STAT OUTP REL POL CURR PROT STAT OUTP PROT DEL VOLT LEV IMM DIG DATA VAL OUTP REL STAT VOLT PROT LEV Sending RCL also does the following m forces an ABORt command before resetting any parameters this cancels any uncompleted trigger actions a disables the calibration function b
32. er circuit and send trigger to power supply 1115 OUTPUT 706 INITIATE TRIGGER 1130 Poll for interrupt caused by change to CC mode and print to screen 1135 Response SPOLL 706 1140 IF NOT BIT Response 7 THEN GOTO 1130 iNo OPER event to report 1145 OUTPUT 706 STAT OPER EVEN Query status operation register 1150 ENTER 706 Oevent Read back event bit 1155 IF BIT Oevent 10 THEN PRINT Supply switched to CC mode 1160 1165 Clear status 1170 OUTPUT 706 CLS 1175 1180 Disable output and save present state in location 2 1185 OUTPUT 706 0UTPUT OFF SAV 2 1190 END Programming Some Power Supply Functions continued Sample Program Code Remote Programming 2 17 Language Dictionary INTRODUCTION This section gives the syntax and parameters for all the IEEE 488 2 SCPI commands and the Common commands used by the power supply It is assumed that you are familiar with the material in Chapter 2 Remote Programming That chapter explains the terms symbols and syntactical structures used here and gives an introduction to programming You should also be familiar with Chapter 5 Front Panel Operation in the Operating Guide in order to understand how the power supply functions The programming examples are simple applications of SCPI commands Since SCPI syntax remains the same for all programming languages the examples are generic Syntax definitions use the long form but only short form headers or k
33. ers Related Commands STAT QUES ENAB STATus QU EStionable CON Dition None STAT QUES COND STATUS QUESTIONABLE CONDITION lt NRi gt Register value None This command and its query set and read the value of the Questionable Enable register This register is a mask for enabling specific bits from the Questionable Event register to set the questionable summary bit QUES of the Status Byte register This bit bit 3 is the logical OR of all the Questionable Event register bits that are enabled by the Questionable Status Enable register Command Syntax Parameters Suffix Default Value Examples Query Syntax Returned Parameters Related Commands STATus QU EStionable ENABle lt NRf gt 0 to 32727 None 0 STAT QUES ENAB 20 STAT QUES ENAB 16 STATus QUEStionable EN A Ble lt NR1 gt Register value STAT QUES STAT QUES NTR PTR Commands These commands allow you to set or read the value of the Questionable NTR Negative Transition and PTR Positive Transistion registers These registers serve as polarity filters between the Questionable Enable and Questionable Event registers to cause the following actions When a bit of the Questionable NTR register is set to 1 then a 1 to 0 transition of the corresponding bit of the Questionable Condition register causes that bit in the Questionable Event register to be set a When a bit of the Questionable PTR register is set to 1 then a 0 to 1 transition of th
34. etween the programming of an output change that produces a CV CC or UNREG condition and the recording of that condition by the Status Operation Condition register The delay prevents the momentary changes in power supply status that can occur during reprogramming from being registered as events by the status subsystem Since the delay applies to CC status it also delays the OCP overcurrent protection feature The OVP overvoltage protection feature is not affected by this delay Examples OUTP PROT CLE OUTPUT PROTECTION CLEAR OUTPUT PROTECTION DELAY 75E i OUTP PROT DEL HIN OUTPUT PROT DELAY MAX Query Syntax OUTP PROT CLE None OUTPut PROTection DELay OUTPut PROTection DELay MIN OUTPup PROTection DELay MAX Returned Parameters lt NR3 gt OUTP PROT DEL returns value of programmed delay OUTP PROT DEL MIN and OUTP PROT DEL MAX return the minimum and maximum programmable delays Related Commands OUTP PROT CLE None OUTP PROT DEL RST RCL SAV OUTP REL Caution Do not install or program the HP Relay Accessories if the power supply maximum output current rating see Table 3 1 exceeds the contact ratings of the relay This command is valid only if the power supply is configured for the optional relay connector Programming ON closes the relay contacts programming OFF opens them The relay is controlled independently of the output state If the power supply is supplying power to a _ load that power will appear at the relay
35. eywords appear in the examples If you have any concern that the meaning of a header in your program listing will not be obvious at some later time then use the long form to help make your program self documenting Parameters Most commands require a parameter and all queries will return a parameter The range for a parameter may vary according to the model of power supply Parameters for all current models are listed in Table 3 1 at the end of this chapter Related Commands Where appropriate related commands or queries are included These are listed either because they are directly related by function or because reading about them will clarify or enhance your understanding of the original command or query Order of Presentation The dictionary is organized as follows a IEEE 488 2 common commands in alphabetical order Subystem commands Common Commands Common commands begin with an and consist of three letters command or three letters and a query Common commands are defined by the IEEE 488 2 standard to perform some common interface functions The power supply responds to the 13 required common commands that control status reporting synchronization and internal operations The power supply also responds to five optional common commands controlling triggers power on conditions and stored operating parameters Introduction Language Dictionary 3 1 Subsystem Commands Subsystem commands are specific to power supply fu
36. he message unit separator Common commands do not affect the active header path you may insert them anywhere in the message VOLT TRIG 7 5 INIT TRG OUTP OFF RCL 2 0UTP ON SCPI Queries Observe the following precautions with queries m Remember to set up the proper number of variables for the returned data a Set the program to read back all the results of a query before sending another command to the power supply Otherwise a Query Interrupted error will occur and the unreturned data will be lost Value Coupling Value coupling results when a command directed to send one parameter also changes the value of a second parameter There is no direct coupling among any power supply SCPI commands However be aware that until they are programmed unititialized trigger levels will assume their corresponding immediate levels For example if a power supply is powered up and VOLT LEV is programmed to 6 then VOLT LEV TRIG will also be 6 until you program it to another value Once you program VOLT LEV TRIG to another value it will remain at that value regardless of how you subsequently reprogram VOLT LEVEL SCPI Data Formats All data programmed to or returned from the power supply is ASCII The data may be numerical or character string 2 6 Remote Programming introduction to SCPI Numerical Data Table 2 1 and Table 2 2 summarize the numerical formats Tabie 2 1 Numerical Data Formats Symbol Talking Formats Digits with an implie
37. he power supply can be connected to the HP IB bus You can set up the HP IB address in one of three ways 1 As a stand alone supply the only supply at the address It has a primary address in the range of 0 to 30 For example 5 or 7 2 As the direct supply in a serial link It is the only supply connected directly to the HP IB bus The primary address is unique and can be from 0 to 30 It is entered as an integer followed by a decimal separator The secondary address always is 0 which may be added after the primary address If the secondary address is omitted it is assumed to be 0 For example 5 0 or 7 3 As a linked supply in serial link It gets its primary address from the direct supply It has a unique secondary address that can be from 1 to 15 It is entered as an integer preceded by a decimal separator For example 4 OF 412 When you enter a secondary address leading zeros between the decimal separator and the first digit are ignored For example 1 01 and 001 are accepted as secondary address 1 and displayed as 0 01 Zeros following a digit are not ignored Thus 10 and 010 are both accepted as secondary address 10 and displayed as 0 10 Changing the Power Supply HP IB Address Use the key and numerical keypad for entering addresses The power supply is shipped with a 5 stand alone address as the default The general procedure for setting an address is Action Display Shows Press Current address Press new addres
38. l clears RQS but not MSS When MSS is set it indicates that the power supply has one or more reasons for requesting service Bit Configuration of Status Byte Register pT egypt ae ae ae ae ae ees ae Bit Weight ESB Event status byte summary MAV Message available MSS Master status summary OPER Operation status summary QUES Questionable status summary RQS Request for service 1 Also represents RQS 2These bits are always zero i Query Syntax STB Returned Paramters lt NR1 gt Register binary value Related Commands None Common Commands Language Dictionary 3 9 TRG TST WAI TRG Meaning and Type Trigger Device Trigger Description This command generates a trigger when the trigger subsystem has BUS selected as its source The command has the same affect as the Group Execute Trigger lt GET gt command Command Syntax TRG Parameters None Query Syntax None Related Commands ABOR CURR TRIG INIT TRIG IMM VOLT TRIG lt GET gt TST Meaning and Type Test Device Test Description This query causes the power supply to do a self test and report any errors see Selftest Error Messages in Chapter 3 Turn On Checkout of the power supply Operating Guide Query Syntax TST Returned Parameters lt NRI gt 0 Indicates power supply passed self test Nonzero Indicates an error code Related Commands None WAI Meaning and Type Wait te Continue Device Status
39. ll QUE Stionable LEVEN CONDition ENABle caer iNTRansition SYSTem ERRor PTRansition NOTES 4 See Appendix A in Operating Manual for calibration commands i LANGuage i WERSion TRiGger p iMMediate i Fig gal i SOURCE Figure 3 2 Subsystem Commands Tree Diagram ABOR This command cancels any trigger actions presently in process Pending trigger levels are reset equal to the their corresponding immediate values ABOR also resets the WTG bit in the Operation Condition Status register see Chapter 4 Status Reporting If INIT CONT ON has been programmed the trigger subsystem initiates itself immediately after ABORt thereby setting WTG ABOR is executed at power turn on and upon execution of RCL or RST Command Syntax ABORt Parameters None Examples ABOR Query Syntax None Related Commands INIT RST TRG TRIG Calibration Commands See Appendix A in the power supply Operating Guide Subsystem Commands Language Dictionary 3 11 CURR CURR TRIG CURR PROT STAT Current Subsystem This subsystem programs the output current of the power supply CURR CURR TRIG These commands set the immediate current level or the pending triggered current level of the power supply The immediate level is the current programmed for the output terminals The pending triggered level is a stored current value that is transferred to the output terminals when a trigger occurs A pending triggered level is u
40. naffected by subsequent CURR commands and remains in effect until the trigger subsystem receives a trigger or an ABORt command is given If there is no pending CURR TRIG level then the query form returns the CURR level In order for CURR TRIG to be executed the trigger subsystem must be initiated see INITiate Command Syntax SOURce CURRent LEVel IMMediate AMPLitude lt NRf gt SOU Rce CURRent LEVel TRiGgered AMPLitude lt NRf gt Parameters Table 3 1 Default Suffix A RST Value able 3 1 Examples CURR 200 MA CURRENT LEVEL 200 MA CURRENT LEVEL IMMEDIATE AMPLITUDE 2 5 CURR TRIG 20 CURRENT LEVEL TRIGGERED 20 Query Syntax SOURce CURRent LEVel IMMediate AMPLitude SOURce CURRent LEVel IMMediate AMPLitude MAX SOURce CURRent LEVel IMMediate AMPLitude MIN SOURce CURReni LEVel TRIGgered AMPLitude SOURce CURRent LEVel TRIGgered AMPLitude MAX SOURce CURRent LEVel TRiIGgered AMPLitude MIN Returned Parameters lt NR3 gt CURR and CURR TRIG return presently programmed immediate and triggered levels If not triggered level is programmed both returned values are the same CURR MAX and CURR MIN return the maximum and minimum programmable immediate current levels CURR TRIG MAX and CURR TRIG MIN return the maximum and minimum programmable triggered current levels Related Commands For CURR SAV RCL RST For CURR TRIG ABOR CURR RST CURR PROT STAT This command en
41. nctions They can be a single command or a group of commands The groups are comprised of commands that extend one or more levels below the root The description of subsystem commands follows the listing of the common commands DESCRIPTION OF COMMMON COMMANDS Figure 3 1 shows the common commands and queries These commands are listed alphabetically in the dictionary If a command has a corresponding query that simply returns the data or status specified by the command then both command and query are included under the explanation for the command If a query does not have a corresponding command or is functionally different from the command then the query is listed separately The description of each common command or query specifies any status registers affected In order to make use of this information you must refer to Chapter 4 Status Reporting which explains how to read specific register bits and use the information that they return Figure 3 1 Common Commands Syntax Diagram 3 2 Language Dictionary Introduction CLS ESE CLS Meaning and Type Clear Status Device Status Description This command causes the following actions see Chapter 4 Status Reporting for descriptions of all registers Clears the following registers mo Standard Event Status oc Operation Status Event c Questionable Status Event co Status Byte Clears the Error Queue a If CLS immediately follows a program message terminator l
42. nd the value read at pin 3 in bit 2 The bits are turned on and off in straight binary code as follows Digital 1 0 Port Programming Chart Bit Pin Bit Pin Configuration Configuration Configuration Configuration 4 Vahe 12 34 Valne 2_ 1 2 3 4 0 1l Lo Lo Output Gnd 4 0 0 i Lo Lo Input Gnd Hi Lo Output Gnd 5 1 0 1 Hi Lo Input Gnd Lo Hi Output Gnd 6 0 1 1 Lo Hi Input Gnd Hi Hi Output Gnd 7 1 1 1 Hi Hi Input Gnd Pins Land 2 are always outputs O Pins 1 and 2 are always outputs Command Syntax SOURce DIGita D ATA VA Lue lt NRf gt Parameters 8 toT Suffix None RST Value 0 Examples DIG DATA 7 DIGITAL DATA VALUE 7 Query Syntax SOUR ce DIGital DATA Returned Parameters lt NRi gt Values from 0 to 7 Related Commands RST RCL SAV Display Subsystem This subsystem controls the state and output of the alphanumeric portion of the display DISP Enables or disables the display When disabled the display characters are blank The annunciators are not affected by this command Command Syntax DISPlay WIN Dow STATe lt bool gt Parameters 0 1 OFF ON Suffix None RST Value ON Examples DISP ON DISPLAY STATE ON Query Syntax DISPlay WIN Dow STATe Returned Parameters lt NRI gt JOorl Related Commands DISP MODE DISP TEXT RST DISP MODE Switches the display between its normal metering mode and a mode in which it displays text sent by the user The command uses the character data lt CRD gt form
43. not have to be concerned about controller hangups as long as your program includes a timeout statement Because the power supply can be programmed to generate SRQ on errors your program can use an SRQ service routine for decoding detected errors The detectable errors are listed in Table 5 1 of Chapter 5 Error Messages Sample Program Cade The following programs are intended only to show how some of the same power tawr functions can be programmed to each of the three previously mentioned HP IB interfaces The first two are for the DOS interfaces and the third for the HP BASIC interface System Considerations Remote Programming 2 13 SAMPLE FOR POWER SUPPLY AT STAND ALONE ADDRESS 6 SEQUENCE SETS UP CV MODE OPERATION FORCES SUPPLY TO SWITCH TO CC MODE AND DETECTS AND REPORTS MODE CHANGE HBC ORG HE Ooi aii aio doiok jak ici dociogeieiok ik ak aki ak ak ak fei ak ak ek ak a HP Vectra PC Controller Using HP 82335A Interface DEE EE EET Oi I EE EEE EEEE EE EEEE EEEE EE EEE EE EE E EE S EEEE E E EEEE EEE E kok 5 S a a nae eeee Merge SETUP SAS here orereem memm me e e u gt 1000 MAX ELEMENTS 2 ACTUAL ELEMENTS 0 MAX LENGTH 80 ACT LENGTH 0 1005 DIM OUTPUTS 2 CODES SPACE 40 ISc 7 PS 706 1020 Set up the Power Supply Interface for DOS driver 1025 CALL IORESET ISC Reset the interface 1030 IF PCIB ERR lt gt NOERR THEN ERROR PCIB BASERR 1035 TIMEOUT 3 1040 CALL IOTIMEOUT ISC TIMEOUT Set timeout to 3 s
44. ns the SCPI version number to which the power supply complies The returned value is of the form YYYY V where YYYY represents the year and V is the revision number for that year Subsystem Commands Language Dictionary 3 21 TRIG Query Syntax Parameters Returned Paramters Examples Related Commands TRIG SOUR SYSTem VERSion none lt NR2 gt SYST VERS None Voltage Subsystem SYSTEM VERSION Trigger Subsystem This subsystem controls remote triggering of the power supply TRIG When the trigger subsystem is enabled TRIG generates a trigger signal The trigger will then 1 Initiate a pending level change as specified by CURR LEV TRIG or VOLT LEV TRIG 2 Clear the WTG bit in the Status Operation Condition register 3 If INIT CONT has been given the trigger subsystem is immediately re enabled for subsequent triggers As soon as it is cleared the WTG bit is again set to 1 Command Syntax TRiGger IM Mediate Parameters None Examples TRIG TRIGGER IMMEDIATE Query Syntax None Related Commands ABOR CURR TRIG INIT TRG VOLT TRIG TRIG SOUR This command selects the trigger source Since the power supply has no other trigger source than the HP IB bus this command need not be used It is included in the command set to provide programming compatibility with other instruments such as the HP Electronic Load family that may have more than one trigger source Command Syntax TRiGer SOURce lt CRD gt
45. ogram react to events within the power supply Chapter 4 Status Reporting explains the functions and bit configurations of all status registers Refer to Figure 4 1 in that chapter while examining the examples given here Detecting Events via SRQ Usually you will want the power supply to generate interrupts assert SRQ upon particular events For this you must selectively enable the appropriate status register bits The following examples allow the power supply to assert SRQ under selected conditions 1 STAT OPER ENAB 1280 PTR 1280 SRE 128 Assert SRQ when the supply switches between CV and CC modes 2 STAT OPER ENAB 1 PTR 1 NTR 1 SRE 128 Assert SRQ when the supply enters or leaves calibration mode 3 STAT QUES 3 PTR 3 SRE 128 Assert SRQ when the supply goes into overvoltage or overcurrent condition 4 STAT OPER ENAB 1280 PTR 1280 STAT QUES 3 PTR 3 SRE 136 Assert SRQ under any event occuring in 1 or 3 above Reading Specific Registers You can exercise program control without interrupts by reading specific registers STAT OPER 1280 EVEN Enable only the CV and CC events and read their status STAT OPER ENAB 1313 PTR 1313 EVEN Enable all conditions of the Operation Status register and read any events STAT OPER ENAB EVENT STAT QUES ENAB EVEN ESE ESR Read which events are active and which events are enabled in the Operation Questionable and Standard Event status registers Note The last
46. ogramming 2 1 Boldface font Boldface font is used to emphasize syntax in command definitions TRIGger DELay lt NRf gt shows a command syntax Computer font Computer font is used to show program text within normal text TRIGger DELay 5 represents program text SCPI Messages There are two types of SCPI messages program and response a A program message consists of one or more properly formatted SCPI commands sent from the controller to the power supply The message which may be sent at any time requests the power supply to perform some action a A response message consists of data in a specific SCPI format sent from the power supply to the controller The power supply sends the message only when commanded by a special program message called a query Types of SCPI Commands SCPI has two types of commands common and subsystem Common Commands Common commands see Figure 3 1 generally are not related to specfic operation but to controlling overall power supply functions such as reset status and synchronization All common commands consist of a three letter nmemonic preceded by an asterisk RST IDN SRE8 Subsystem Commands Subsystem commands see Figure 3 2 perform specific power supply functions They are organized into an inverted tree structure with the root at the top Some are single commands while others are grouped under other subsystems Structure of a SCPI Message SCPI messages consist of one or mor
47. on program IBCONF EXE 2 12 Remote Programming System Considerations Your application program will not include the power supply symbolic name and HP IB address These must be specified during configuration when you run IBCONF EXE Note that the primary address range is from 0 to 30 but any secondary address must be specified in the address range of 96 to 126 The power supply expects a message termination on EOI or line feed so set FOI w last byte of Write It is also recommended that you set Disable Auto Serial Polling All function calls return the status word IBSTA which contains a bit ERR that is set if the call results in an error When ERR is set an appropriate code is placed in variable IBERR Be sure to check IBSTA after every function call If it is not equal to zero branch to an error handler that reads IBERR amp to extract the specific error Error Handling If there is no error handling code in your program undetected errors can cause unpredictable results This includes hanging up the controller and forcing you to reset the system Both of the above DOS drivers have routines for detecting program execution errors important Use error detection after every call to a subroutine HP BASIC Controllers The HP BASIC Programming Language provides access to HP IB functions at the operating system level This makes it unnecessary to have the header files required in front of DOS applications programs Also you do
48. ply Variable PS Stand Alone Address 706 1005 CODES SPACE 50 MODE SPACE 5 OEVENT SPACE 20 1010 D SPACE 60 OUTPUT SPACE 40 BDNAME PS 1015 DIM OUTPUT 2 1020 1025 Set up power supply interface for DOS driver 1030 CALL IBFIND BDNAME PS 1035 IF PS lt O THEN PRINT IBFIND Failed 1040 CALL IBCLR PS 1045 1050 Program power supply to CV mode with following voltage and current 1055 CODES VOLTAGE 7 8 CURRENT 480 GOSUB 2000 1060 1065 Query power supply outputs and print to screen 1070 CODES MEASURE VOLTAGE CURRENT GOSUB 2000 GOSUB 3000 1075 VOUT OUTPUT 1 1080 IOUT OUTPUT 2 1085 PRINT The programmed levels are VOUT Volts and IOUT Amps 1090 1095 Program triggered current level to value insufficient to maintain 1100 supply within its CV operating characteristic 1105 CODES CURR TRIG 50 GOSUB 2000 1110 1115 Set operation status mask to detect mode change from CV to CC 1120 CODES STAT OPER ENAB 1024 PTR 1024 GOQSUB 2000 1125 1130 Enable Status Byte OPER summary bit 1135 CODES SRE 128 GOSUB 2000 1140 1145 Arm trigger circuit and send trigger to power supply 1150 CODES IWITIATE TRIGGER GOSUB 2000 Programming Some Power Supply Functions continued Sampie Program Code Remote Programming 2 15 1160 Wait for supply to respond to trigger 1165 FOR I 1 to 100 NEXT I 1170 1175 Poll for
49. pply status registers The power supply has three groups of status registers Operation Questionable and Standard Event The Standard Event group is programmed with Common commands as described in Chapter 4 Status Reporting The Operation and Questionable status groups each consist of the Condition Enable and Event registers and the NTR and PTR filters Status Operation Registers The bit configuration of all Status Operation registers is shown in the following table Bit Configuration of Operation Registers Bit Weight 2048 1024 512 256 CAL Interface is computing new calibration constants CC The power supply is in constant current mode CV The power supply is in constant voltage mode NU Not used WTG The interface is waiting for a trigger Note See Chapter 4 Status Reporting for more explanation of these registers STAT OPER This query returns the value of the Operation Event register The Event register is a read only register which holds latches all events that are passed by the Operation NTR and or PTR filter Reading the Operation Event register clears it Query Syntax STATus OPERtion EVENt Parameters None Returned Parameters lt NR1 gt Register Value Examples STAT OPER STATUS OPERATIONAL EVENT Related Commands CIS STAT OPER NTR STAT OPER PTR Subsystem Commands Language Dictionary 3 17 STAT OPER COND STAT OPER ENAB STAT OPER NPR PTR STAT OPER COND This query returns
50. query string can be handled without difficulty However you should request too many queries the system may return a Query DEADLOCKED error 430 In that case break the long string into smaller parts Programming the Digital I O Port Digital control ports 1 and 2 are TTL outputs that can be programmed either high or low Control port 3 can be programmed to be either a TTL input or a TTL output Send a decimal parameter that translates into the desired straight binary code for these ports See DIG DATA VAL in Chapter 3 Language Dictionary for the port bit configurations DIG DATA 3 Set ports 1 and 2 high and make 3 another output port DIG DATA 7 Set ports 1 and 2 high and make 3 an input port DIG DATA Read back the present port configuration 2 10 Remote Programming Examples SYSTEM CONSIDERATIONS The remainder of this chapter addresses some system issues concerning programming These are power supply addressing and the use of the following types of HP IB system interfaces 1 HP Vectra PC controller with HP 82335A HP IB Interface Command Library 2 IBM PC controller with National Instuments GPIB PCII Interface Handler 3 HP controller with HP BASIC Language System The HP IB Address The power supply address cannot be set remotely it must be set from the front panel Once the address is set you can assign it inside programs Setting the HP IB Address Figure 4 6 in the power supply Operating Guide shows the ways t
51. red Under certain conditions see Turn On Conditions in Chapter 5 Front Panel Operation of the Operating Guide location 0 may hold the device state that is automatically recalled at power turn on The following power supply parameters are stored by SAV CURR LEV IMM OUTP STAT OUTP REL POL CURR PROT STAT OUTP PROT DEL VOLT LEV IMM DIG DATA VAL OUTP REL STAT VOLT PROT LEV Command Syntax SAV lt NRf gt Parameters 0 1 2 3 Example SAV 3 Query Syntax None Related Commands RCL RST Caution The power supply uses nonvolatile memory for recording register states Programs that repeatedly use SAV for recalling states cause frequent write cycles to the memory and can eventually exceed the maximum number of write cycles for the memory see in the power supply Operating Guide SRE Meaning and Type Service Request Enable Device Interface Description This command sets the condition of the Service Request Enable Register This register determines which bits from the Status Byte Register see STB for its bit configuration are allowed to set the Master Status Summary MSS bit and the Request for Service RQS summary bit A 7 in any Service Request Enable Register bit position enables the corresponding Status Byte Register bit and all such enabled bits then are logically ORed to cause Bit 6 of the Status Byte Register to be set See Chapter 4 Status Reporting for more details concerning this
52. rms to the IEEE Standard Digital Interface for Programmable Instrumentation SCPI is layered on top of the hardware portion of IEEE 488 2 The same SCPI commands and parameters control the same functions in different classes of instruments For example you would use the same DISPlay command to control the power supply display state and the display state of a SCPI compatible multimeter Note HPSL Hewlett Packard System Language and TMSL Test and Measurement System Language were earlier versions of SCPI If you have programmed in either then you probably can go directly to Chapter 3 Language Dictionary Conventions The following conventions are used throughout this chapter Angle brackets lt gt Items within angle brackets are parameter abbreviations For example lt NR1 gt indicates a specific form of numerical data Vertical bar Vertical bars separate one of two or more alternative parameters For example 0 OFF indicates that you may enter either 0 or OFF for the required parameter Square Brackets Items within square brackets are optional The representation SOURce CURRent means that SOURCce may be omitted Braces Braces indicate parameters that may be repeated zero or more times It is used especially for showing arrays The notation lt A gt lt B gt shows that A is a required parameter while B may be omitted or may be entered one or more times Introduction to SCPI Remote Pr
53. s Query Syntax Parameters Default Suffix Examples Returned Parameters Output Subsystem MEASure CURRent DC MEASure VOLTage DC None A for MEAS CURR V for MEAS VOLT MEAS CURR MEAS VOLT MEASURE VOLTAGE DC MV lt NR3 gt This subsystem controls the power supply s voltage and current outputs and an optional output relay Caution Do not install or program the HP Relay Accessories if the power supply maximum output current rating see Table 3 1 exceeds the contact ratings of the relay OUTP This command enables or disables the power supply output The state of a disabled output is a condition of zero output voltage and a model dependent minimum source current see Table 3 1 The query form returns the output state Command Syntax OUTPut STATe lt bool gt Parameters 0 OFF 1 0ON Suffix None RST Value 0 Examples DUTP 1 OUTPUT STATE ON Query Syntax OUTPut STATe Returned Parameters lt NRI gt orl Related Commands RST RCL SAV OUTP PROT There are two output protection commands that do the following OUTP PROT CLE Clears any OV overvoltage OC overcurrent unless set via external voltage control OT overtemperature or RI remote inhibit protection features After this command the output is restored to the state it was in before the protection feature occurred Subsystem Commands Language Dictionary 3 15 OUTP PROT OUTP REL OUTP REL POL OUTP PROT DEL Sets the time b
54. s keys New address replaces numbers on the display Press Display returns to meter mode If you try to enter a forbidden number ADDR ERROR is displayed The following examples show how to set addresses To set stand along primary address 6 press To set direct supply primary address 6 press Address 6 X X Enter To set linked secondary address 1 press Address 1 Enter To set linked secondary address 12 press Address 1 2 Enter System Considerations Remote Programming 2 11 Note The power supply display will reset recall the state in location 0 whenever you change between the following types of HP IB addresses ea stand alone primary address and a direct primary address ea direct primary address and a secondary address Assigning the HP IB Address in Programs The following examples assume that the HP IB select code is 7 the the power supply is 6 and that the power supply address will be assigned to the variable PS 1000 Stand alone address The power supply will respond it is set to 6 1010 PS 706 Statement for HP82335A Interface 1010 ASSIGN PS TO 706 Statement for HP BASIC Interface 1020 Direct address The power supply will respond if it is set to 6 or 6 0 1030 PS 70600 Statement for HP82335A Interface 1030 ASSIGN PS TO 70600 Statement for HP BASIC Interface 1040 Linked address 1 The power supply will respond if it is set to address 1 and is serially connected to a supply at direc
55. spect the power supply is simply a bus instrument How to format ASCII statements within your I O programming statements SCPI commands are nothing more than ASCII data strings incorporated within those I O statements The basic operating principles of the power supply as explained in Chapter 5 Front Panel Operation of the Operating Guide How to set the HP IB address of the power supply This cannot be done remotely but only from the supply s front panel see System Considerations in Chapter 2 Remote Programming 1 2 Introduction Remote Programming HP IB CAPABILITIES OF THE POWER SUPPLY All power supply functions except for setting the HP IB address are programmable over the IEEE 488 bus also known as the Hewlett Packard Interface Bus or HP IB The IEEE 488 1 capabilities of the power supply are listed in the Supplemental Characteristics of the Operating Guide The power supply operates from an HP IB address that is set from the front panel see System Considerations at the end of this chapter INTRODUCTION TO SCPI Important Learn the basics of power supply operation see Chapter 5 Front Panel Operation in the power supply Operating Guide before using SCPI SCPI Standard Commands for Programmable Instruments is a programming language for controlling instrument functions over the HP IB IEEE 488 instrument bus SCPI is intended to function with standard HP IB hardware and confo
56. t address 6 0 1050 PS 706 01 HP82335A Interface 1090 ASSIGN PS TO 706 01 HP BASIC Interface For sytems using the National Instruments DOS driver the address is specified in the software configuration program IBCONFIG EXE and assigned a symbolic name The address then is referenced only by this name within the application program see the National Instruments GP IB documentation DOS Drivers Types of Drivers The HP 82335A and National Instruments GP IB are two popular DOS drivers Each is briefly described here See the software documention supplied with the driver for more details HP 82335A Driver For GW BASIC programming the HP IB library is implemented as a series of subroutine calls To access these subroutines your application program must include the header file SETUP BAS which is part of the DOS driver software SETUP BAS starts at program line 5 and can run up to line 999 Your application programs must begin at line 1000 SETUP BAS has built in error checking routines that provide a method to check for HP IB errors during program execution You can use the error trapping code in these routines or write your own code using the same variables as used by SETUP BAS National Instruments GP iB Driver Your program must include the National Instruments header file DECL BAS This contains the initialization code for the interface Prior to running any applications programs you must set up the interface with the configurati
57. t NL gt then the output queue and the MAV bit are also cleared Command Syntax CLS Parameters None Query Syntax None ESE Meaning and Type Event Status Enable Device Status Description This command programs the Standard Event Status Enable register bits The programming determines which events of the Standard Event Status Event register see ESR are allowed to set the ESB Event Summary Bit of the Status Byte register A 1 in the bit position enables the corresponding event All of the enabled events of the Standard Event Status Event Register are logically ORed to cause the Event Summary Bit ESB of the Status Byte Register to be set See Chapter 4 Status Reporting for descriptions of all three registers Bit Configuration of Standard Event Status Enable Register it Position 7 6 5 4 3 2 1 0 Bit Name PON o CMp EXE DDE gye o OPC Bit Weight 128 64 32 16 8 4 2 a 1 i CME Command error DDE Device dependent error EXE Execution error OPC Operation complete PON Power on QYE Query error Common Commands Language Dictionary 3 3 ESE ESR IDN Command Syntax ESE lt NRf gt Parameters 0 to 255 Power On Value See PSC Suffix None Example ESE 129 Query Syntax ESE Returned Parameters lt NR1 gt Register value Related Commands ESR PSC STB Caution If PSC is programmed to 0 then the ESE command causes
58. t bit in the Operation Event register to be set w When a bit of the Operation PTR register is set to 1 then a 0 to 1 transition of the corresponding bit in the Operation Condition register causes that bit in the Operation Event register to be set m If the same bits in both NTR and PTR registers are set to 1 then any transition of that bit at the Operation Condition register sets the corresponding bit in the Operation Event register w If the same bits in both NTR and PTR registers are set to 0 then no transition of that bit at the Operation Condition register can set the corresponding bit in the Operation Event register Note Setting a bit in the value of the PTR or NTR filter can of itself generate positive or negative events in the corresponding Operation Event register 3 18 Language Dictionary Subsystem Commands STAT OPER NTR PTR STAT PRES STAT QUES Command Syntax STATus OPERtion NTRansition lt NRf gt STATus OPERtion PTRansition lt NRf gt Parameters 0 to 32727 Suffix None Default Value 0 Examples STAT OPER NTR 32 STAT OPER PTR 1312 Query Syntax STAT OPER NTR STAT OPER PTR Returned Parameters lt NR1 gt Register value Related Commands STAT OPER ENAB STAT PRES This command sets all defined bits in the Status Subsystem PTR registers and clears all bits in the subsytem NTR and Enable registers STAT OPER PTR is set to 1313 and STAT QUES PTR is set to 1555 Command Syntax STATus PRESet Parameters None Examples
59. t commands OPC is intended to be used at the end of a command line so that the application program can then monitor the bus for data until it receives the 1 from the power supply Output Queue Caution Do not follow OPC with TRG or HP IB bus triggers Such triggers sent after OPC will be prevented from executing and will prevent the power supply from accepting further commands If this occurs the only programmable way to restore operation is by sending the power supply a HP IB DCL Device Clear command Query Syntax OPC Returned Parameters lt NRI gt ASCII 7 is placed in the Output Queue when the power supply has completed operations Related Commands OPC TRIG WAI Common Commands Language Dictionary 3 5 OPT PSC RCL OPT Meaning and Type Option Identification Query Description This query requests the power supply to identify any options that are installed Options are identified by number A 0 indicates no options are installed Query Syntax OPT Returned Parameters lt AARD gt PSC Meaning and Type Power on Status Clear Device Initialization Description This command controls the automatic clearing at power turn on of m the Service Request Enable register a the Standard Event Status Enable register If the command parameter 1 then the above registers are cleared at power turn on If the command parameter 0 then the above registers are not cleared at power turn on but are programm
60. tinued Command Parameters Subsystem Commands cont STAT OPER COND STAT OPER ENAB STAT OPER ENAB STAT OPER EVEN STAT OPER NTR STAT OPER NTR STAT OPER PTR STAT OPER PTR STAT PRES STAT QUES COND STAT QUES ENAB STAT QUES EN AB STAT QUES EVEN SYST ERR SYST LANG SYST LANG SYST VERS TRIG IMM TRIG SOUR TRIG SOUR SOUR VOLT LEV IMM AMPL SOUR VOLT LEV IMMI AMPL SOUR VOLT LEV TRIG AMPI SOUR VOLT LEV TRIG AMPL none TMSL COMP none none lt NRf gt suffix none MINIMAX lt NRf gt suffix none MIN MAX SOUR VOLT PROT LEV lt NRf gt suffix SOUR VOLT PROT LEV lt NRf gt suffix CLS None None SRE None ESE lt NRf gt PSC lt beol gt ESE None PSC None STB None ESR None RCL lt NRf gt TRG None IDN None None None OPC lt NRf gt PROGRAMMING PARAMETERS Table 3 1 list the programming parameters for each of the models Command Summary Language Dictionary 3 25 Table 3 1 Power Supply Programming Parameters see note HP Model and Value CURR LEV MAX and 6641A 6642A 8643A 6644A 6645A CURR LEV TRIG MAX 20 475A 10 237A 6 142A 3 583A 1 535 A Programming range is 0 to MAX 6651A 6652A 6653A 6654A 6655A 51 188 A 25 594 A 15 356 A 9 214 A 4 095 A
61. to 2 5 V INTIT CONT ON Program the trigger circuit for continuous arming OUTP ON Enable the output to 5 V TRIG Trigger the output voltage to 2 5 V VOLT TRIG 5 TRIG Set the pending trigger level to 5 V and trigger the output voltage back to 5 V INTIT CONT OFF Remove the continuous triggger arming Saving and Recalling States You can remotely save and recall operating states See SAV and RCL in Chapter 3 Language Dictionary for the parameters that are saved and recalled Note When you turn the power supply on it automatically retrieves the state stored in location 0 When a power supply is delivered this location contains the factory defaults see RST in Chapter 3 Language Dictionary OUTP OFF VOLT LEV 6 5 PROT 6 8 Program a desired operating state CURR LEV 335 PROT STAT ON SAV 2 Save this state to location 2 RCL 2 Later recall this same state Writing to the Display You can include messages to the front panel LCD in your programs The description of DISP TEXT in Chapter 3 Language Dictionary shows the number and types of permitted display characters In order to write to the display you must first change it to text mode as shown in the following example DIS MODE TEXT Switch display to tert mode RECALLED 2 Write Recalled 2 to the display DIS MODE NORM Return dispaly to its normal mode Examples Remote Programming 2 9 Programming Status You can use status programming to make your pr
62. u enter STATUS the active header path moves one colon to the right The interface is now ready to accept OPERATION PRESET or QUESTIONABLE as the next header Note that you must include the colon because it is required between headers If you next enter OPERATION the active path again moves one colon to the right The interface is now ready to accept EVENT CONDITON ENABLE NTRANSITION or PTRANSITION as the next header If you now enter ENABLE you have reached the end of the command string The active header path remains at ENABLE If you wished you could have entered ENABLE 18 PTRANSITION 18 and it would be accepted The entire message would be STATUS OPERATION ENABLE 18 PTRANSITION 18 The message terminator after PTRANSITION 18 returns the path to the root The Effect of Optional Headers If a command includes optional headers the interface assumes they are there For example if you enter STATUS OPERATION the interface recognizes it as STATUS OPERATION EVENT see Figure 2 2 This returns the active path to the root STATUS But if you enter STATUS OPERATION EVENT then the active path remains at EVENT This allows you to send STATUS OPERATION EVENT CONDITION in one message If you tried to send STATUS OPERATION CONDITION the command path would send STATUS OPERATION EVENT and then return to STATUS instead of to CONDITION The optional header SOURCE preceeds the current digital and
63. voltage subsystems see Figure 3 2 This effectively makes CURRENT DIGITAL and VOLTAGE root level commands introduction to SCPI Remote Programming 2 5 Moving Among Subsystems In order to combine commands from different subsystems you need to be able to restore the active path to the root You do this with the root specifier For example you could clear the output protection and check the status of the Operation Condition register as follows see Figure 3 2 OUTPUT PROTECTION CLEAR STATUS OPERATION CONDITION By using the root specifier you could do the same thing in one message OUTPUT PROTECTION CLEAR STATUS OPERATION CONDITION Se a rn eee eee a Note The SCPI parser traverses the command tree as described in Appendix A of the IEEE 488 2 standard The Enhanced Tree Walking Implementation given in that appendix is not implemented in the power supply ee Oc a ae OL De a The following message shows how to combine commands from different subsystems as well as within the same subsystem see Figure 3 2 VOLTAGE LEVEL 7 PROTECTION 8 CURRENT LEVEL 150 PROTECTION ON Note the use of the optional header LEVEL to maintain the correct path within the voltage and current subsystems and the use of the root specifier to move between subsytems Including Common Commands You can combine common commands with system commands in the same message Treat the common command as a message unit by separating it with t
64. y setting CAL STATe to OFF m sets display functions as follows o DISP WIND STATe to ON o DISP WIND MODE to NORMal o DISP WIND TEXT to a sets INIT CONT to OFF w sets TRIG SOUR to BUS At power turnon the power supply normally is returned to the factory defined turn on state see RST However it also may turn on to the state stored in location 0 see Turn On Condition under Chapter 5 Front Panel Operation of the power supply Operating Guide Command Syntax RCL lt NRf gt Parameters 0 1 2 3 Example RCL 3 Query Syntax None Related Commands PSC RST SAV RST Meaning and Type Reset Device State Description This command resets the power supply to a factory defined state as defined below RST also forces an ABORt command Command State CAL STAT OFF OUTP STAT OFF CURR LEV IMM OUTP PROT DEL CURR LEV TRIG OUTP REL STAT OFF CURR PROT STAT OFF OUTP REL POL NORM DIG DATA 0 TRIG SOUR BUS DISP WIND STAT ON VOLTLLEV IMM DISP WIND MODE NORM VOLT LEV TRIG DISP WIND TEXT VOLT PROT LEV INIT CONT OFF Model dependent value See Table 3 1 Command Syntax RST Parameters None Query Syntax None Related Commands PSC SAV Common Commands Language Dictionary 3 7 SAV SRE SAV Meaning and Type SAVE Device State Description This command stores the present state of the power supply to the specified location in memory Up to four states can be sto

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