NI Instrument Simulator User Manual
Contents
1. Switches GPIB 1 2 3 4 5 Address ON OFF OFF ON ON 25 OFF ON OFF ON ON 26 ON ON OFF ON ON 27 OFF OFF ON ON ON 28 ON OFF ON ON ON 29 OFF ON ON ON ON 30 ON ON ON ON ON Undefined GPIB Emulation Specific Information When the simulator is emulating a GPIB device you must use a specific command order in some cases When you write a command that returns data you must perform a read of at least 1 byte before trying to send a second command to the simulator If you attempt to send a command before reading some data it is not accepted and the command times out If you perform a partial read of the simulator response to a command request and then issue another command the remaining data of the partial read no longer exists Serial Device Emulation You can configure the simulator to mimic a serial device using the settings on the rear panel of the unit If you want to change the configuration of the simulator power off the unit and change the switch settings To make the simulator emulate a serial device set the S mode G mode switch to S mode switch 8 is OFF as shown in Figure 1 3 Switches 1 through 3 set the baud rate and switches 4 through 7 set the data format Figure 1 3 shows the DIP switch Note The numbers 1 8 do not actually appear on the box They are included in the picture as a reference aid NI Instrument Simulator User Manual 1 4 National Instruments Corporation Operation of the Simul2. NI Instrument Simulator User Manual December 1997 Edition Part Number 320638C 01 Copyright 1996 1997 National Instruments Corporation All Rights Reserved Internet Support E mail support natinst com FTP Site ftp natinst com Web Address http www natinst com Bulletin Board Support BBS United States 512 794 5422 BBS United Kingdom 01635 551422 BBS France 01 48 65 15 59 Fax on Demand Support 5124181111 Telephone Support USA Tel 512 795 8248 Fax 512 794 5678 International Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 288 3336 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 5 520 2635 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 200 51 51 Taiwan 02 377 1200 United Kingdom 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin Texas 78730 5039 USA Tel 512 794 0100 Important Information Warranty Copyright Trademarks The NI Instrument Simulator is warranted against defects in materials and workmanship for a period of two years from the date of shipment as evidenced by receipts or other documentation National Instruments will at its op
3. j z N This chapter describes the command set used by the Instrument Simulator including examples to illustrate usage Waveform Format The Instrument Simulator generates a 128 point waveform in either ASCII or binary ASCII waveforms are preceded by the header CURVE Binary waveforms are preceded by a pound sign and the number of bytes that are in the waveform All waveforms terminate with a line feed lt LF gt character Floating Point ASCII default CURVE lt space gt num0 numl numl27 lt LF gt The floating point format used is 1 2345 E 10 8 bit Unsigned Binary 3128 lt Byte 0 gt lt Byte 1 gt lt Bytel27 gt lt LF gt 16 bit Signed Binary NORMal byte order 3256 lt MSB 0 gt lt LSB 0 gt lt MSB 127 gt lt LSB 127 gt lt LF gt 16 bit Signed Binary SWAPped byte order 3256 lt LSB 0 gt lt MSB 0 gt lt LSB 127 gt lt MSB 127 gt lt LF gt Simulator Commands The Instrument Simulator uses SCPI like commands The commands are shown in long form however the simulator accepts only the short form of the command Send only the part of the command that is shown in BOLD UPPERCASE characters You can send multiple commands to the simulator by separating them with a semicolon National Instruments Corporation 2 1 NI Instrument Simulator User Manual NI Instrument Simulator Command Set Address Command You can use the address command to change the GPIB addr
4. Query simulator for the waveform scaling information Multimeter Configuration Commands These commands simulate the operation of a meter They return one value in ASCII floating point MEASure DC Returns a random value between 0 to x in floating point ASCII The range of x depends on the CONFigure DC command CONFigure DC DEFault MEASure DC returns a number between 0 and 10 MIN MEASure DC returns a number between 0 and 1 MAX MEASure DC returns a number between 0 and 100 CONFigure DC Returns the current configuration setting Examples CONF DC MAX Set the maximum range NI Instrument Simulator User Manual 2 4 National Instruments Corporation CONF DC MEAS DC Other Commands NI Instrument Simulator Command Set Query the current DC range For example if the command was issued after the command above it would return CONF DC MAX lt LF gt Queries one value for example 1 2308 lt LF gt These commands perform miscellaneous functionality as indicated in the description of each command IDN RST TRG TST OPC OPC FORMat SREGister ASCii HEX ESR Returns National Instruments GPIB and Serial Device Simulator Rev B x lt LF gt Resets the simulator to its default state Triggers the simulator and returns one random reading same as MEAS DC Simulates testing the simulator returns OK Sets the operation complete bit in the St
5. as a reference aid S MODE DATA FORMAT BAUD RATE T T A 12345678 ON GPIB ADDRESS G MODE Figure 1 2 Sample GPIB Emulation Mode Switch Setting NI Instrument Simulator User Manual 1 2 National Instruments Corporation Operation of the Simulator as a Serial or GPIB Device The settings for each of the GPIB primary addresses are shown in Table 1 1 The factory default setting GPIB address 2 is shown in bold italic Table 1 1 GPIB Address Switch Settings for GPIB Device Emulation Switches GPIB 1 2 3 4 5 Address OFF OFF OFF OFF OFF 0 ON OFF OFF OFF OFF 1 OFF ON OFF OFF OFF 2 ON ON OFF OFF OFF 3 OFF OFF ON OFF OFF 4 ON OFF ON OFF OFF 5 OFF ON ON OFF OFF 6 ON ON ON OFF OFF 7 OFF OFF OFF ON OFF 8 ON OFF OFF ON OFF 9 OFF ON OFF ON OFF 10 ON ON OFF ON OFF 11 OFF OFF ON ON OFF 12 ON OFF ON ON OFF 13 OFF ON ON ON OFF 14 ON ON ON ON OFF 15 OFF OFF OFF OFF ON 16 ON OFF OFF OFF ON 17 OFF ON OFF OFF ON 18 ON ON OFF OFF ON 19 OFF OFF ON OFF ON 20 ON OFF ON OFF ON 21 OFF ON ON OFF ON 22 ON ON ON OFF ON 23 OFF OFF OFF ON ON 24 National Instruments Corporation 1 3 NI Instrument Simulator User Manual Operation of the Simulator as a Serial or GPIB Device Table 1 1 GPIB Address Switch Settings for GPIB Device Emulation Continued
6. the format and type of the waveform Typically ASCII waveforms take longer than binary waveforms SOURce FUNCtion SINusoid SQUare NOISe RANDom PCHirp SOURce FUNCtion Examples SOUR FUNC SIN SOUR FUNC Waveform Query Commands SENSe DATA Sine waveform default Square waveform Noisy sine waveform Random noise waveform Chirp waveform Returns the current waveform type Generate a sinusoid waveform Query the current waveform type For example if the command was issued after the preceding command it would return SOUR FUNC SIN lt LF gt Returns the waveform data in the format specified by the waveform format commands SENSe VOLTage RANGe OFFSet SENSe VOLTage RANGe National Instruments Corporation 2 3 Returns the Y offset for the waveform in ASCII floating point Returns the Y multiplier for the waveform in ASCII floating point NI Instrument Simulator User Manual NI Instrument Simulator Command Set SENSe SWEep TIME Returns the X increment 1E 3 in ASCII floating point SENSe VOLTage HEADer Returns all of the waveform scaling information in the format OFFSET x XXXXE x RANGE x XXXXE x TIME 1E 3 lt LF gt For integer formatted waveforms the offset and range are used to scale the raw integer data as follows ScaledPoint i WaveformPoint i offset range Examples SENS DATA Query simulator for the waveform SENS VOLT HEAD
7. 100 cmpl previous value 2 ud0 ibsad 99 0100 cmpl previous value 0 Trigger and then read a DC measurement ud0 ibwrt trg 0100 cmpl count 5 ud0 ibra 1000 2100 end cmpl count 9 36 2e 30 35 30 39 45 31 6 0509E1 Oa Reset the simulator to the default settings ud0 ibwrt rst 0100 cmpl count 4 Reset the IBIC descriptor to the default settings ud0 ibonl 1 0100 cmpl National Instruments Corporation 3 15 NI Instrument Simulator User Manual Examples Query for waveform scaling information then read the result ud0 ibwrt sens volt head 0100 cmpl count 15 ud0 ibrd 1000 2100 end cmpl count 33 4f 46 46 53 45 54 2e 30 2c 52 41 4e 3d 31 2e 30 2c 54 45 3d 31 2e 30 45 Oa 3d 47 49 2d Place the IBIC descriptor offline udo ibonl 0 0100 NI Instrument Simulator User Manual cmpl 3 16 30 45 4d 33 FSET RAN 0 T e O j il w HO cs il Ha Oo cs HQ National Instruments Corporation Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products This information helps us provide quality products to meet your needs Title Edition Date Part Number NI Instrument Simulator User Manual December 1997 320638C 01 Please comment on the completeness clarity and organization of the manual If you find e
8. 42 20 61 6e 64 20 53 65 B and Se 72 69 61 6c 20 44 65 76 rial ev 69 63 65 20 53 69 6d 75 i e Simu 6c 61 74 6f 72 20 52 65 lator Re v B 76 20 42 2e 31 Oa National Instruments Corporation 3 13 NI Instrument Simulator User Manual Examples NI Instrument Simulator User Manual 3 14 Use ibwrt to request a simulator test as follows ud0 ibwrt tst 0100 cmpl count 5 Read the simulator test response ud0 ibrd 1000 2100 end cmpl count 3 6f 6b Oa ok Query the current DC range then read the DC range as follows ud0 ibwrt conf dc 0100 cmpl count 8 ud0 ibrd 1000 2100 end cmpl count 13 43 4f 4e 46 3a 20 44 43 CONF DC 20 44 45 46 Oa DEF Set the maximum response range then query and read the current DC range again as follows ud0 ibwrt conf dc max 0100 cmpl count 11 ud0 ibwrt conf dc 0100 cmpl count 8 ud0 ibrd 1000 2100 end cmpl count 13 43 4f 4e 46 3a 20 44 43 CONE DC 20 4d 41 58 Oa MAX Request a DC measurement ud0 ibwrt meas dc 0100 cmpl count 8 National Instruments Corporation Examples Request the DC measurement ud0 ibrd 1000 2100 end cmpl count 9 30 2e 37 39 32 35 45 32 0 7925E2 0a Set the GPIB address of the simulator to PAD 7 SAD 99 ud0 ibwrt saddr 7 99 0100 cmpl count 10 Change the IBIC descriptor to reference device at PAD 7 and SAD 99 ud0 ibpad 7 0
9. OFF is preparing a response for example preparing a sine wave for output Serial Emulation Specific Information When using the simulator as a serial device you should be aware of special issues dealing with command termination RTS CTS flow control message headers end of string character choice and ATN and SRQ LEDs Command Termination When using the unit as a serial device simulator terminate commands with either a carriage return or line feed so the unit knows when the command is complete otherwise it does not act on the command RTS CTS Hardware Flow Control The unit uses RTS CTS flow control to indicate when it is ready to receive data and when the controller is ready to receive data This prevents data corruption and errors that may occur when the unit is not ready to receive data You must use a serial cable and software that supports RTS CTS flow control Serial Message Header When the simulator is emulating a serial device it sends a header before every response indicating how many data bytes are to follow This header takes the form of xxxxx r n and should be read to indicate how National Instruments Corporation 1 7 NI Instrument Simulator User Manual Operation of the Simulator as a Serial or GPIB Device many bytes will follow An example is a response to the tst command Command tst Response 00003 r nOK n The 00003 indicates that there are three more bytes after the header The he
10. SCII header into an integer byte count Scan header Ss gt i amp ByteCount reads the actual data from the device ComRd ComPort buffer ByteCount closes the COM port so other applications can use it CloseCom ComPort discards the header and converts ASCII data to floating point array Scan buffer Ss i6 gt S250f x plots the data YGraphPopup return 0 National Instruments Corporation Waveform Plot waveform waveform 128 VAL_DOUBLE 3 11 NI Instrument Simulator User Manual Examples Example 3 This example shows how to setup the simulator to assert an SRO after it generates a chirp wave and is ready to output the data include lt gbib h gt include lt formatio h gt include lt userint h gt int main int argc char argv char buffer 2000 double waveform 2000 int ud udl static char SPR initializes the gpib board ud0 ibfind gpib0 sets the board as controller in charge ibsic ud0 opens and initializes the device udi ibfind DEV2 changes the software configuration parameters ibconfig ud0 IbcAUTOPOLL 0 writes data to the device ibwrt udil SRE 0x10 SOUR FUNC PCH SENS DATA 34 waits for the SRQ line to be asserted indicating message available ibwait ud0 SRQI conducts a serial poll ibrsp udl amp SPR reads the response data from the device ibrd udl
11. ader eliminates timeouts due to reading the serial port before data is present and specifies how much data is actually present This information is important because serial transfers do not specify an end of string character End of String Character For serial input from the simulator the EOS character should be set to NONE because simulator responses can contain the NULL byte 00 and r n which could cause a premature termination of the serial port read ATN and SRQ LEDs The ATN and SRQ LEDs indicate service request and attention assertion and are useful only for GPIB emulation The ATN LED may be lit but you should ignore it if the simulator is in serial emulation mode The SRQ LED indicates that the device is requesting service but use it as a visual clue only You should read the STB register to determine the status byte Common Problems With Serial Emulation Other serial mode considerations are as follows e Ifyou are sending commands but the serial simulator is not responding be sure that the commands are terminated with a carriage return or line feed e Ifyou notice that you are not receiving the complete message for example sys help only sends back SYS HELP check the EOS character being used It should be set to NONE If it is set to LF or CR the read is terminated prematurely NI Instrument Simulator User Manual 1 8 National Instruments Corporation Chapter 2 NI Instrument Simulator Command Set
12. agrams for a VI that acquires and displays a square wave from a LabVIEW simulator in G mode or S mode Graph 10 0 Port 5 0 Serial A GPIB 00 5 0 10 0 I l l l l 0 25 50 75 100 125 150 Figure 3 1 Example 1 Front Panel National Instruments Corporation 3 1 NI Instrument Simulator User Manual Examples TOO ONE 0 0 1 paaa This will use GPIB sourfunc squ sens data Figure 3 2 Example 1 Sequence Frame 0 Diagram NI Instrument Simulator User Manual 3 2 National Instruments Corporation Examples e CE CC CR CR R BONE 1 01 ppe ead waveform and plot the data as i Read the data using GPIB Extract single data float Figure 3 3 Example 1 Sequence Frame 1 Diagram National Instruments Corporation 3 3 NI Instrument Simulator User Manual Examples Example 2 This example shows the LabVIEW front panel and diagrams for a VI that configures the simulator in G mode to assert an SRQ after generating a chirp wave The generated chirp wave is retrieved and displayed Graph 8 0 6 0 40 x 0 2 0 a ESR Register w i 4 0 4 mo 6 0 1 1 I i 0 20 40 60 60 100 120 140 Figure 3 5 Example 2 Sequence Frame 0 Diagram NI Instrument Simulator User Manual 3 4 National Instruments Corporation Examples Figure 3 6 Example 2 Sequence Frame 1 Diagram Send command
13. andard Event Status Register ESR Returns a 1 regardless of the OPC bit value Specifies the output of ESR ESE STB and SRE registers as an ASCII string default Specifies the output of ESR ESE STB and SRE registers in hex Returns value of Standard Event Status register as specified by FORM SREG Figure 2 1 illustrates the bits defined by the simulator for the ESR register bit 7 Power On bit 5 Command Error and bit 0 Operation Complete Bit 7 is set when the simulator is powered on bit 5 is set when the simulator receives an invalid command bit 0 is set when the simulator receives the OPC command You can use the ESR National Instruments Corporation 2 5 NI Instrument Simulator User Manual NI Instrument Simulator Command Set command to query the value of the ESR register The value returned is in either ASCII or HEX as specified by the FORMat SREGister command The ESR register is cleared after you read it peration Complete S uw TD E E Q Figure 2 1 Three ESR Bits Set by the Simulator ESE Ox Sets value of Standard Event Status Enable register represents a mask in hex ESE Returns value of Standard Event Status Enable register as specified by FORM SREG STB Returns value of Status Byte register as specified by FORM SREG Figure 2 2 illustrates the bits defined by the simulator for the STB register bit 6 Request Se
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15. ar buffer 2000 double waveform 2000 int ud0 udl int main int argc char argv initializes the gpib board ud0 ibfind gpib0 sets the board as controller in charge ibsic ud0 opens and initializes the device udl ibfind DEV2 writes the command string ibwrt ud1l SOUR FUNC SQU SENS DATA 24 reads the response data from the device ibra udl buffer 2000 discards the header and converts ASCII data to floating point array Scan buffer Ss i6 gt 5250f x waveform plots the data YGraphPopup Waveform Plot waveform 130 VAL DOUBLE return 0 NI Instrument Simulator User Manual 3 10 National Instruments Corporation Example 2 This example shows how to use the device as a serial device and request a square wave and then plot it include include include include int main lt rs232 h gt lt formatio h gt lt userint h gt lt gpib h gt int argc char argv char buffer 2000 char header 8 double waveform 2000 int ComPort 1 int ByteCount Examples opens the COM port and configures it for the serial settings OpenComConfig ComPort coml S600 0 6 1 612 SLZ writes the command string to the port note the linefeed at the end ComWrt ComPort SOUR FUNC SQU SENS DATA n 25 reads the header to determine how many bytes will follow ComRd ComPort header 7 converts the A
16. ator as a Serial or GPIB Device S MODE DATA FORMAT BAUD RATE T T OFF min 12345678 ON GPIB ADDRESS G MODE Figure 1 3 Changing the S Mode Characteristics In Figure 1 3 switch 8 is set to S mode so the labels on top of the switch apply Switches 1 through 3 are ON OFF and ON respectively indicating that the serial port is operating at 9600 baud Switches 4 and 5 are both OFF which indicates that parity is disabled Switch 6 is OFF indicating stop bit character Switch 7 is ON indicating that the simulator is using 8 bits per character for serial data transfers The unmarked DIP switches on the rear panel are reserved for future development and should remain in the OFF position Tables 1 2 and 1 3 show the possible configurations for the baud rate and data format switches when you are using serial emulation and what each configuation indicates Table 1 2 S Mode Switch Settings for Serial Port Baud Rate Switches 1 2 3 Baud Rate OFF OFF OFF 300 ON OFF OFF 600 OFF ON OFF 1200 ON ON OFF 2400 OFF OFF ON 4800 ON OFF ON 9600 OFF ON ON Reserved ON ON ON Reserved National Instruments Corporation 1 5 NI Instrument Simulator User Manual Operation of the Simulator as a Serial or GPIB Device Table 1 3 S Mode Switch Settings for Data Formatting Characteristics Switch Positi
17. buffer 2000 discards the header and converts to floating point Scan buffer Ss i6 gt 128f x waveform plots the returned waveform YGraphPopup Waveform Plot waveform 128 VAL DOUBLE return 0 NI Instrument Simulator User Manual 3 12 National Instruments Corporation Examples IBIC Example The following example uses the National Instruments text based interactive control program IBIC for GPIB to communicate with a simulator in G mode Several of the miscellaneous commands are demonstrated Bold text indicates that the text is automatically printed to the screen When you launch IBIC text similar to the following appears on the screen National Instruments wIN32 Interactive Control Program Copyright C 1996 National Instruments Corp All rights reserved Type help for help or q to quit Use ibdev to open a device descriptor connected to GPIBO referencing the device with primary address PAD 2 and no secondary address SAD The device descriptor uses a 10 s I O timeout asserts EOI on the last byte of writes and uses no EOS modes ibdev 0 2 0 13 1 0 Use ibwrt to request simulator identification as follows ud0 ibwrt idn 0100 cmpl count 5 Use ibra to read the simulator identification which is returned as follows ud0 ibrd 1000 2100 end cmpl count 62 4e 61 74 69 6f 6e 61 6c National 20 49 6e 73 74 72 75 6d Instrum 65 6e 74 73 20 47 50 49 ents GPI
18. e eee ota 3 13 Documentation Comment Form Figures Figure 1 1 Simulator Rear Panel ss 1 2 Figure 1 2 Sample GPIB Emulation Mode Switch Setting oe eeeee 1 2 Figure 1 3 Changing the S Mode Characteristics c ce eeeseeeeeseeseeseceeeeseeeeeees 1 5 Figure 2 1 Three ESR Bits Set by the Simulator oo cece cecseeeeeeneeeseens 2 6 Figure 2 2 STB Byte and Description 2 7 Figure 3 1 Example 1 Front Panel oo eee ee eeceeeeeeeceeeeeceseaecneenseseeneeeeeees 3 1 Figure 3 2 Example 1 Sequence Frame 0 Diagram ou eee cece ese eeeeeeeneeeseees 3 2 Figure 3 3 Example 1 Sequence Frame 1 Diagram ou eee eee eseceeeecneeeeeens 3 3 Figure 3 4 Example 2 Front Panel ss 3 4 Figure 3 5 Example 2 Sequence Frame 0 Diagram ou eee ese esecneeeecneeeeeens 3 4 Figure 3 6 Example 2 Sequence Frame 1 Diagram ou eee ee ceeeseceeeeeneeeeeens 3 5 Figure 3 7 Example 2 Sequence Frame 2 Diagram ou eee eee eseeseceeeeeeneeneeens 3 5 Figure 3 8 Example 2 Sequence Frame 3 Diagram ou eee eee essere ceeeeecneeeseens 3 6 Figure 3 9 Example 2 Sequence Frame 4 Diagram ou eee eee eee eeceeeeecneeneeens 3 6 Figure 3 10 Example 2 Sequence Frame 5 Diagram ou eee ese ese ceeeeeeeneeeeeens 3 7 Figure 3 11 Example 3 Front Panel oo eee eeeeceseeeeecseeceecaeeaecaeensecseneeeeees 3 7 Figure 3 12 Example 3 Sequence Frame 0 Diagram ou eee eee ese ee ceeeeeeneeeeeens 3 8 Figure 3 13 Example 3 Sequence Frame 1 Diagram wu eee eee ese eeeeeecneeeeee
19. e reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation CVI LabVIEW and The Software is the Instrument are trademarks of National Instruments Corporation Product and company names listed are trademarks or trade names of their respective companies WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS National Instruments products are not designed with components and testing intended to ensure a level of reliability suitable for use in treatment and diagnosis of humans Applications of National Instruments products involving medical or clinical treatment can create a potential for accidental injury caused by product failure or by errors on the part of the user or application designer Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel and all traditional medical safeguards equipment and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used National Instruments products are NOT intended to be a substitute for any form of established process procedure or equipment used to monitor
20. ed on the rear panel control the simulator emulation mode G mode or S mode as well as settings specific to each mode The unmarked DIP switches are reserved for future development and should remain in the OFF position Figure 1 1 shows the rear panel National Instruments Corporation 1 1 NI Instrument Simulator User Manual Operation of the Simulator as a Serial or GPIB Device S MODE DATA FORMAT BAUD RATET T OFF ari 1 1 t ti 1 ONU OFF GPIB ADDRESS G MODE Figure 1 1 Simulator Rear Panel GPIB Device Emulation You can configure the simulator to mimic a GPIB device using the switch settings on the rear panel of the unit This emulation is similar to an IEEE 488 2 device but not to the exact specifications To make the simulator act as a GPIB device set the S MODE G MODE switch to G MODE switch 8 is ON as shown in Figure 1 2 Switches 6 and 7 must remain in the OFF position while the simulator is in G mode The primary GPIB address is determined using the switches labeled GPIB Address The secondary address can be set using the SADDR command If you want to change the primary address power off the unit and change the switch settings Figure 1 2 shows the simulator configured to emulate a GPIB device at primary GPIB address 2 ior Note The numbers 1 8 do not actually appear on the box They are included in the picture
21. ess used by the simulator The power on default for the primary GPIB address is determined by the rear panel switch setting Secondary addressing is disabled by default The address command is used as follows SADDRess primary secondary Examples SADDR 2 Set the address to 2 SADDR 3 4 Set the primary address to 3 and the secondary address to 4 Waveform Format Commands The following commands format how the waveform data is returned by the simulator FORMat DATA ASCii Floating point default INTeger 8 8 bit unsigned binary INTeger 16 16 bit signed binary FORMat DATA Returns the current waveform format The following command changes the order of the bytes returned by INTeger 16 encoding FORMat BORDer NORMa 1 High byte first lt MSB gt lt LSB gt SWAPped Low byte first lt LSB gt lt MSB gt default FORMat BORDer Returns the current format of the byte order Examples FORM DATA INT 16 Set the waveform format as 16 bit integers NI Instrument Simulator User Manual 2 2 National Instruments Corporation FORM DATA Waveform Generation Commands NI Instrument Simulator Command Set Query the current waveform format For example if the command was issued after the preceding command it would return FORM DATA INT 16 lt LF gt These commands generate a 128 point waveform of the specified type The number of cycles in the waveform is random Waveform generation can take 2 to 15 seconds depending on
22. les only if used with shielded interface cables of suitable quality and construction National Instruments used such cables to test this device and provides them for sale to the user The use of inferior or nonshielded interface cables could void the user s authority to operate the equipment under the FCC rules If necessary consult National Instruments or an experienced radio television technician for additional suggestions The following booklet prepared by the FCC may also be helpful Interference to Home Electronic Entertainment Equipment Handbook This booklet is available from the U S Government Printing Office Washington DC 20402 Canadian Department of Communications This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Table of Contents ra Fr Chapter 1 Operation of the Simulator as a Serial or GPIB Device NI Instrument Simulator Overview iii 1 1 Rear Panel sir ann ai el ee idee RIT ees 1 1 GPIB Device Emulation Eire ns en ns Mon destine 1 2 GPIB Emulation Specific Information 1 4 Serial Device Emulation fs lun 1 4 Serial Emulation Specific Information 1 7 Command Termination 0 ccceececsseessceesececseceececeeeeaeeceeeeceeeeeneenees 1 7 RTS CTS Hardware Flow Control 1 7 Serial Message Header eneee nina EIDES 1 7 E
23. nd of String Character ss 1 8 ATN and SRO LEDS speit inn a ERER 1 8 Common Problems With Serial Emulation ce cescceeeeceeceeeeeeeeeesseceneeees 1 8 Chapter 2 NI Instrument Simulator Command Set WavVeform Onn aE IRET A i ke eh lea ees 2 1 Simulator Commands ernia E r teen cosas E EE E EE EE a NA es 2 1 Address COMMAN ites r e e EEE EE E ARS 2 2 EXAMpPles 5e ME nn at en nn melas 2 2 Waveform Format Commands Rs 2 2 Examples st bet a a cbilvlasgbtvene E E E min ete 2 2 Waveform Generation Commands 2 3 Examples ieaie oiae ares a nabs eaa aiT 2 3 Waveform Query Commands ss 2 3 EXAaMPl s omnee e a E E A EE a a E Se 2 4 Multimeter Configuration Commands s sssessesseseeeseeseesereserseeesessrrsressesseee 2 4 EXAMpPl s seit a a e ete E E E EEEE en E AAS 2 4 Other C mM nd Sea a aaaea aa A E AR A ASES 2 5 National Instruments Corporation v NI Instrument Simulator User Manual Table of Contents Chapter 3 Examples LabVIEW Examples sccc cscs ste esces init cane ee ent 3 1 Example lasse in ENS ne nuBeeato uae Ree 3 1 Example c1 i3 Ane Wes she unk ea a a ea a RO ie 3 4 Xampl She denses AA nn Rae ARE 3 7 LabWindows CVI Examples ss 3 10 Example Less tint a nn nn ie nl le tement 3 10 Example is ae ta us ae ne mea me tu Re LS 3 11 Example 3 ETN nn teen tr ne 3 12 IBIC Example ss nn Mn a ein
24. ns 3 8 Figure 3 14 Example 3 Sequence Frame 2 Diagram ou eee eee eseeseceeeeeeneeeneens 3 9 Figure 3 15 Example 3 Sequence Frame 3 Diagram ou eee eeeeseeseceeeeseeneeneeens 3 9 Tables Table 1 1 GPIB Address Switch Settings for GPIB Device Emulation 1 3 Table 1 2 S Mode Switch Settings for Serial Port Baud Rate 1 5 Table 1 3 S Mode Switch Settings for Data Formatting Characteristics 1 6 Table 1 4 LED Information in S Mode o0 eee cree esecseeeceeeeeceesenseneeeaes 1 7 NI Instrument Simulator User Manual vi National Instruments Corporation 5 VAY Chapter 1 gs Operation of the Simulator Z as a Serial or GPIB Device aa hv This chapter describes the different settings and information for using the simulator as either a GPIB or serial device NI Instrument Simulator Overview The NI Instrument Simulator allows the simulation of either a GPIB device G mode or a serial device S mode In either mode the simulator emulates typical output from a digitizing oscilloscope or a digital multimeter In S mode GPIB specific functionality SRQ and GPIB addressing are not supported The Instrument Simulator is ideal for debugging or training Using the simulator instead of traditional instruments to debug systems saves time and effort Also National Instruments uses the simulator in our customer education courses Rear Panel The labeled configuration switches locat
25. on Indication 4 OFF Odd parity ON Even parity 5 OFF Parity generation checking disabled ON Parity generation checking enabled 6 OFF 1 stop bit character ON 2 stop bits per character 7 OFF 7 bits per character ON 8 bits per character 8 OFF Operation in S mode ON Operates in G mode To operate the Instrument Simulator as a serial device set switch 8 to OFF S mode Set the remaining switches to match the characteristics of the terminal or computer you attach to the other end of the serial cable Often you can change the serial port characteristics of the terminal or computer by setting switches or running a utility program or from within a programming environment To use the simulator as a serial device your software and serial cable must support RTS CTS Hardware flow control When the simulator is acting as a serial device the LEDs provide information about the state of the unit Table 1 4 describes each state NI Instrument Simulator User Manual 1 6 National Instruments Corporation Operation of the Simulator as a Serial or GPIB Device Table 1 4 LED Information in S Mode LED State of the Unit LISTEN Unit is waiting for a command TALK Unit is sending data using serial interface LISTEN and Receive error current command will be TALK are ON ignored Resend command to clear error LISTEN and When the unit has the ready and power LEDs TALK are both ON but the listen and talk LEDs are off the unit
26. or safeguard human health and safety in medical or clinical treatment FCC DOC Radio Frequency Interference Class A Compliance This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the instructions in this manual may cause interference to radio and television reception Classification requirements are the same for the Federal Communications Commission FCC and the Canadian Department of Communications DOC This equipment has been tested and found to comply with the following two regulatory agencies Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Notices to User Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment under the FCC Rules This device complies with the FCC ru
27. rrors in the manual please record the page numbers and describe the errors Thank you for your help Name Title Company Address Phone Fax Mail to Customer Education National Instruments Corporation 6504 Bridge Point Parkway Austin TX 78730 5039 Fax to Customer Education National Instruments Corporation 512 794 5678
28. rvice bit 5 ESB condition is met and bit 4 Message Available MAV is true When any of these conditions are set in the SRE byte and it becomes set in the STB an SRQ is generated The SRQ bit is cleared after the request is serviced You can use the Serial Poll Service G mode only or request the STB using the STB command to query the status information The value returned is either ASCII or HEX depending on the format specified by the FORMat SREGister command NI Instrument Simulator User Manual 2 6 National Instruments Corporation NI Instrument Simulator Command Set SE amp ESR gt oc lt ow gt rIstsT4lsfelro Figure 2 2 STB Byte and Description SRE 0x Sets value of Service Request Enable register represents a mask in hex SRE Returns value of Service Request Enable register as specified by FORM SREG WAL No functionality included to make the simulator IEEE 488 2 compatible FORMat SREGister Returns the current format of the registers SYStem HELP Returns a list of all of the commands National Instruments Corporation 2 7 NI Instrument Simulator User Manual Chapter 3 A Examples 2a f L f This chapter gives several sample Instrument Simulator applications The examples use LabVIEW LabWindows CVI and IBIC the GPIB interactive control utility LabVIEW Examples Example 1 This example shows the front panel and di
29. tion repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this manual is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no event shall National Instruments be liable for
30. to read the ESR register Figure 3 7 Example 2 Sequence Frame 2 Diagram National Instruments Corporation 3 5 NI Instrument Simulator User Manual Examples Figure 3 9 Example 2 Sequence Frame 4 Diagram NI Instrument Simulator User Manual 3 6 National Instruments Corporation Examples Figure 3 10 Example 2 Sequence Frame 5 Diagram Example 3 This example shows the LabVIEW front panel and diagrams for a VI that acquires and displays a noisy sine wave from a simulator in G mode Graph Figure 3 11 Example 3 Front Panel National Instruments Corporation 3 7 NI Instrument Simulator User Manual Examples Read the waveform string remove the header and trailing line feed and cast the string as an array Figure 3 13 Example 3 Sequence Frame 1 Diagram NI Instrument Simulator User Manual 3 8 National Instruments Corporation Examples Read the scaling string extract the scaling values convert to numerics and plot the array Figure 3 15 Example 3 Sequence Frame 3 Diagram National Instruments Corporation 3 9 NI Instrument Simulator User Manual Examples LabWindows CVI Examples Example 1 This example shows how to use a GPIB device to request a square wave and then read the data and plot the response include lt formatio h gt include lt userint h gt include lt gpib h gt ch
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