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Chapter 6

GPIB Programming Techniques

© National Instruments Corp.

6-3

NI-488.2M UM for Windows NT

The second byte is a GPIB secondary command that indicates the number of meters of
cable in your system. It is called the Configure (CFGn) message. Because HS488 can
operate only with cable lengths of 1 to 15 meters, only CFGn values of 1 through 15
(hex 61 through 6F) are valid. If the cable length was configured properly in

wibconf

,

you can determine how many meters of cable are in your system by calling

ibask

(option

IbaHSCableLength

) in your application program. For CFE and CFGn

messages, refer to Appendix A, Multiline Interface Messages, in the NI-488.2M Function
Reference Manual for Windows NT .

System Configuration Effects on HS488

Maximum data transfer rates can be limited by your host computer and GPIB system
setup. For example, even though the theoretical maximum transfer rate with HS488 is
8 Mbytes/s, the maximum transfer rate obtainable on PC -compatible computers with an
ISA bus is 2 Mbytes/s. The same IEEE 488 cabling constraints for a 350 ns T1 delay
apply to HS488. As you increase the amount of cable in your GPIB configuration, the
maximum data transfer rate using HS488 decreases. For example, two HS488 devices
connected by two meters of cable can transfer data faster than three HS488 devices
connected by four meters of cable.

Waiting for GPIB Conditions

You can use the

ibwait

function to obtain the current

ibsta

value or to suspend your

application until a specified condition occurs on the GPIB. If you use

ibwait

with a

parameter of zero, it immediately updates

ibsta

and returns. If you want to use

ibwait

to wait for one or more events to occur, then pass a wait mask to the function.

The wait mask should always include the TIMO event; otherwise, your application is
suspended indefinitely until one of the wait mask events occurs.

Device-Level Calls and Bus Management

The NI-488 device-level calls are designed to perform all of the GPIB management for
your application program. However, the NI-488.2M driver can handle bus management
only when the GPIB interface board is CIC (Controller-In-Charge). Only the CIC is able
to send command bytes to the devices on the bus to perform device addressing or other
bus management activities. Use one of the following methods to make your GPIB board
the CIC:

•

If your GPIB board is configured as the System Controller (default), it automatically
makes itself the CIC by asserting the IFC line the first time you make a device-level
call.

•

If your setup includes more than one Controller, or if your GPIB interface board is
not configured as the System Controller, use the CIC Protocol method. To use the
protocol, issue the

ibconfig

function (option

IbcCICPROT

) or use the

ibconf

configuration utility to activate the CIC protocol. If the interface board is not CIC,

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Содержание NI-488.2M

Страница 1: ...Copyright 1994 1996 National Instruments Corporation All Rights Reserved NI 488 2M User Manual for Windows NT January 1996 Edition Part Number 320646B 01...

Страница 2: ...elgium 02 757 00 20 Canada Ontario 519 622 9310 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Italy 02 48301892 Japa...

Страница 3: ...ts if errors are suspected In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NAT...

Страница 4: ...ty 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 pr...

Страница 5: ...tion Requirements 1 5 The NI 488 2M Software Elements 1 6 NI 488 2M Driver and Driver Utilities 1 6 DOS and 16 bit Windows Support Files 1 7 C Language Files 1 7 Sample Application Files 1 7 How the N...

Страница 6: ...the Device 3 9 Step 4 Trigger the Device 3 9 Step 5 Wait for the Measurement 3 9 Step 6 Read the Measurement 3 10 Step 7 Process the Data 3 10 Step 8 Place the Device Offline 3 10 Writing Your NI 488...

Страница 7: ...dressing 4 5 Termination Method 4 6 Common Questions 4 6 Chapter 5 ibic Interface Bus Interactive Control Utility 5 1 Overview 5 1 Example Using NI 488 Functions 5 1 ibic Syntax 5 4 Number Syntax 5 4...

Страница 8: ...evices 6 5 Service Requests from IEEE 488 2 Devices 6 5 Automatic Serial Polling 6 6 Stuck SRQ State 6 6 Autopolling and Interrupts 6 7 SRQ and Serial Polling with NI 488 Device Functions 6 7 SRQ and...

Страница 9: ...7 7 Enable Auto Serial Polling 7 7 Enable CIC Protocol 7 8 Assert REN When SC 7 8 Device Template Configuration 7 8 Name 7 9 Access Board 7 9 GPIB Primary Address 7 9 GPIB Secondary Address 7 9 Termi...

Страница 10: ...le 8 2 19 Figure 2 9 Program Flowchart for Example 9 2 21 Figure 3 1 General Program Shell Using NI 488 Device Functions 3 7 Figure 3 2 General Program Shell Using NI 488 2 Routines 3 12 Figure 7 1 Ma...

Страница 11: ...Application Development and Examples Getting Started Manual Novice Users Installation and Configuration NI 488 2M Function Reference Manual for Windows NT Experienced Users Function and Routine Descri...

Страница 12: ...control program that you can use to communicate with GPIB devices interactively Chapter 6 GPIB Programming Techniques describes techniques for using some NI 488 functions and NI 488 2 routines in your...

Страница 13: ...vice names variables and for statements taken from program code bold monospace Bold text in this font denotes the messages and responses that the computer automatically prints to the screen italic mon...

Страница 14: ...ts Protocols and Common Commands Microsoft Windows NT System Guide Microsoft Win 32 Software Development Kit for Windows NT Tools Customer Communication National Instruments wants to receive your comm...

Страница 15: ...generic set of common device commands Talkers Listeners and Controllers GPIB devices can be Talkers Listeners or Controllers A Talker sends out data messages Listeners receive data messages The Contr...

Страница 16: ...r Because the Controller is usually at primary address 0 it sends hex 20 address 0 with bit 5 set to make itself a Listener Figure 1 1 shows the configuration of the GPIB address bits Bit Position 7 6...

Страница 17: ...age byte DAV data valid Talking device indicates signals on data lines are stable valid data Interface Management Lines Five GPIB hardware lines manage the flow of information across the bus Table 1 2...

Страница 18: ...ded 24 conductor cable with both a plug and receptacle connector at each end With this design you can link devices in a linear configuration a star configuration or a combination of the two Figure 1 2...

Страница 19: ...respective boards Printer Plotter Digital Voltmeter gpib0 gpib1 One GPIB Another GPIB Figure 1 3 Example of Multiboard System Setup Configuration Requirements To achieve the high data transfer rate t...

Страница 20: ...ins the following driver and utility files readme txt is a documentation file that contains important information about the NI 488 2M software and a description of any new features Before you use the...

Страница 21: ...2M software gpib nt com is the DOS device driver When you run an existing NI 488 2 application for DOS in the Windows NT environment this file replaces the gpib com driver that you used in the DOS env...

Страница 22: ...GPIB hardware The top two layers of the layered NT device driver are accessed from user mode by gpib 32 dll a 32 bit Windows NT dynamic link library GPIB applications access the NI 488 2M software th...

Страница 23: ...4 How the NI 488 2M Software Works with Windows NT Unloading and Reloading the NI 488 2M Driver You can unload and restart the NI 488 2M driver using the ibconf utility The icon for ibconf is located...

Страница 24: ...lish communication between a host computer and a GPIB device clr_trg c is the source code file for Example 2 It illustrates how you can clear and trigger GPIB devices asynch c is the source code file...

Страница 25: ...he multimeter to take measurements and record each measurement as it occurs To do this he has written an application that uses some simple high level GPIB commands The following steps correspond to th...

Страница 26: ...NT Computer Multimeter INIT Read Measurement from Multimeter Finished Getting Measurements CLEAN UP Yes No ibwrt ibrd VOLTS Tell Multimeter to Take Measurement 5 volts 1 2 3 5 Set Up Multimeter to Tak...

Страница 27: ...mmand to the oscilloscope This command clears the internal registers of the oscilloscope reinitializing it to default values and settings 3 The application sends a command to the oscilloscope telling...

Страница 28: ...oscope to Get Reading Finished Reading CLEAN UP Yes No ibclr ibtrg Clear Command Request Data from Oscilloscope CURV Clear Oscilloscope ibwrt Define Task to Be Done When Oscilloscope is Triggered Trig...

Страница 29: ...urer She acquires and prints images with the aid of an application program she wrote using high level GPIB commands The following steps correspond to the program flowchart in Figure 2 3 1 The applicat...

Страница 30: ...NT Computer INIT Print Image Asynchronously CLEAN UP Non GPIB Activity Save to Disk Color Printer Print Image Image Scan Non GPIB Activity Compute Statistics More Images Yes No Yes No ibwrta 1 2 3 4 5...

Страница 31: ...d In this case the scanner expects the commands to be terminated with CR LF carriage return r and linefeed n The application sets its end of string EOS byte to LF The linefeed code indicates to the sc...

Страница 32: ...dows NT Read Status Computer Scanner INIT Set EOS Mode CLEAN UP ibclr ibeos Change Scan Resolution Reset Internal State RES 3 r n ibwrt Read Data ibwrt ibrd Start Scan OK scan r n Scanned Data ibrd 1...

Страница 33: ...designer has previously established that the default values for the film recorder are appropriate for the type of film she is using 3 The application advances the new roll of film into position so th...

Страница 34: ...recorder asserts the SRQ line to signal it is done advancing the film 9 As soon as the application s wait for RQS completes the application serial polls the film recorder to see if it requested servi...

Страница 35: ...for the Film Recorder to Request Service Finished Loading Film ibclr ibwait FRM Read Response from the Film Recorder Response Advance Film Clear Film Recorder Clear Command ibrsp 1 2 4 3 5 No ibwrt Y...

Страница 36: ...ecorder to Request Service Advance Film Read Response From Film Recorder 6 6a 6b 6c 7 8 9 10 Yes ibwait These steps are repeated 3 times once for each color pass ibwrt ibwait Reached End of Film No Co...

Страница 37: ...e purposes of his future work with these tensile testers he needs to determine what GPIB addresses they have been set to He can do so with the aid of a simple application he has written The following...

Страница 38: ...r 3 Who s Listening Get a List of Devices Present on GPIB Device 1 is Here Device 2 is Here Device 3 is Here MUTT 10426 MUTT 10528 1 2 3 4 5 MUTT 10383 GPIB Cable GPIB Cable GPIB Cable Receive Receive...

Страница 39: ...ond to the program flowchart in Figure 2 7 1 The application initializes the GPIB by bringing the interface board in the computer online 2 The application configures the strain gauges to request servi...

Страница 40: ...Wait for 1 or More Strain Gauges to Request Service 3 No Did You Request Service Did You Request Service Yes Serial Poll Each Strain Gauge Until One Requesting Service is Located 4 Response Get a Rea...

Страница 41: ...ard in the computer online 2 The application configures the temperature transducer in the first monitoring unit by choosing which of the eight GPIB data lines the transducer uses to respond when a par...

Страница 42: ...llel Polls Non GPIB Activity Parallel Poll Enable Start Power Supplies No Temp Transducer Yes 1 2 3 4 5 6 7 9 PPollConfig PPollConfig PPoll Unconfigure 8 PPoll MIX ON SendList PPollUnconfig Power Supp...

Страница 43: ...llowing steps correspond to the program flowchart in Figure 2 9 1 The application brings the device online 2 The application waits for any of three events to occur the device to become listen addresse...

Страница 44: ...ce Controller INIT Wait to be Talk Addressed Listen Addressed or Cleared Write Out New Data No ibwait fffffffffff Is This the Clear Event Is This the Talk Addressed Event Reset Internal State Yes Yes...

Страница 45: ...s to all of the NI 488 and NI 488 2 calls For example it exports a pointer to the NI 488 ibwrt function For a detailed example showing how to use direct access refer to the sample program dlldev c tha...

Страница 46: ...han NI 488 2 routines The following sections describe these different function types NI 488 Device Functions Device functions are high level functions that automatically execute commands that handle b...

Страница 47: ...h NI 488 function and NI 488 2 routine updates four global variables to reflect the status of the device or board that you are using The status word ibsta the error variable iberr and the count variab...

Страница 48: ...brd GPIB error TIMO 14 4000 dev brd Time limit exceeded END 13 2000 dev brd END or EOS detected SRQI 12 1000 brd SRQ interrupt received RQS 11 800 dev Device requesting service SPOLL 10 400 brd Board...

Страница 49: ...is set in ibsta indicating that an error has occurred For more information on error codes and solutions refer to Chapter 4 Debugging Your Application or Appendix B Error Codes and Solutions Count Vari...

Страница 50: ...Utility Writing Your NI 488 Application This section discusses items you should include in your application program general program steps and an NI 488 example In this manual the example code is pres...

Страница 51: ...ing NI 488 functions The flowchart is for device level calls No Yes No No Closed All Devices Yes START Make a Device Level Call Send Data to Device Receive Data from Device Clear Device Serial Poll De...

Страница 52: ...R gpiberr ibdev error The input arguments of the ibdev function are as follows 0 board index for GPIB0 1 primary GPIB address of the device 0 no secondary GPIB address for the device T10s I O timeout...

Страница 53: ...a measurement TRIGGER 2 and to assert the SRQ line when the measurement completes and the multimeter is ready to send the result SRE 16 Step 4 Trigger the Device If you configure the device to wait f...

Страница 54: ...Status Byte 0x x n StatusByte Step 6 Read the Measurement If the data is valid read the measurement from the instrument AsciiToFloat is a function that takes a null terminated string as input and out...

Страница 55: ...ritten to use direct entry to access the gpib 32 dll dll4882 c The NI 488 2M software also includes the source code for nine application examples which are described in Chapter 2 Application Examples...

Страница 56: ...e Receive Clear Device DevClear Serial Poll Device ReadStatusByte and so on Address Devices to Listen SendSetup Send Data to Addressed Listener SendDataBytes Address Device to Talk ReceiveSetup Receiv...

Страница 57: ...ment is the list of instruments that was created the third argument is a list of instrument addresses that the procedure actually found and the last argument is the maximum number of devices that the...

Страница 58: ...Did not find the Fluke n ibonl 0 0 exit 1 The constant NLend signals that the new line character with EOI is automatically appended to the data to be sent The constant STOPend indicates that the read...

Страница 59: ...to the multimeter Send 0 fluke VAC AUTO TRIGGER 2 SRE 16 29L NLend if ibsta ERR gpiberr Send setup error Step 6 Trigger the Instrument In the previous step the multimeter was instructed to wait for a...

Страница 60: ...us Byte printf Status Byte 0x x n statusByte Step 8 Read the Measurement Use the Receive function to read the measurement over the GPIB The first argument is the GPIB interface board number and the se...

Страница 61: ...n program you must compile the application program using Microsoft Visual C C version 2 0 or higher Next link the application with the C language interface gpib 32 obj To compile and link a Win32 cons...

Страница 62: ...entry refer to the Win32 SDK Software Development Kit documentation In your Win32 application you first need to load gpib 32 dll The following code fragment demonstrates how to call the LoadLibrary fu...

Страница 63: ...a Win32 console application named cprog in a DOS shell type the following on the command line cl cprog c To run your application from the Windows environment select the Run option from the Start menu...

Страница 64: ...nfig nt file to load gpib nt com whenever a DOS application is executed The config nt file is located in your winnt system32 directory where winnt is your Windows NT directory for example c windows To...

Страница 65: ...ware is configured correctly See your Getting Started manual for more information There are several reasons why ibtest might be unable to access the NI 488 2M driver If the software is not properly in...

Страница 66: ...ies in the system log explaining why it failed to start You can examine the system log by running the Event Viewer utility in the Administrative Tools window of the Program Manager Events that might a...

Страница 67: ...pical GPIBInfo output is as follows GPIBInfo Sep 29 1993 Copyright 1993 National Instruments Corp All rights reserved Software Information The NI 488 2M Software for Windows NT is loaded You are runni...

Страница 68: ...and Solutions These appendixes can help you interpret the state of the driver GPIB Error Codes Table 4 1 lists the GPIB error codes Remember that the error variable is meaningful only when the ERR bi...

Страница 69: ...gram as described in your getting started manual Timing Errors If your application fails but the same calls issued in ibic are successful your program might be issuing the NI 488 2 calls too quickly f...

Страница 70: ...of this manual or the section about ibdiag in the getting started manual for specific information about what might cause these tests to fail How do I communicate with my instrument over the GPIB Refer...

Страница 71: ...refer to Chapter 5 ibic Interface Bus Interactive Control Utility How can I determine which type of GPIB board I have installed Run the GPIBInfo utility It returns information about the GPIB boards c...

Страница 72: ...oot problems and develop your application program One way ibic helps you to learn about your instrument and to troubleshoot problems is by displaying the following information on your screen whenever...

Страница 73: ...help for help or q to quit 2 Use ibdev to find the device name which is assigned to your device in the ibconf program The following example shows how you could use ibdev to open a device assign it to...

Страница 74: ...F3R7T3 0100 cmpl count 6 or ud0 ibwrt F3R7T3 0100 cmpl count 6 5 Trigger the device as follows ud0 ibtrg 0100 cmpl 6 Wait for a timeout or for your device to request service If the current timeout lim...

Страница 75: ...4 7 E 0 0a 0a 9 Place the device offline as follows ud0 ibonl enter value 0 0100 cmpl or ud0 ibonl 0 0100 cmpl 10 Terminate the ibic program by entering q at the prompt ibic Syntax When you enter com...

Страница 76: ...and n r represents a carriage return character and n represents a linefeed character You can use these special characters to insert the carriage return and linefeed characters into a string as in F3R...

Страница 77: ...EOS message ibeot v Enable disable END message ibln v v Check for presence of device on the GPIB at pad sad ibloc Go to local ibonl v Place device online or offline ibpad v Change primary address ibp...

Страница 78: ...ontroller to standby ibist v Set clear ist iblines Read the state of all GPIB control lines ibln v v Check for presence of device on the GPIB at pad sad ibloc Go to local ibonl v Place device online o...

Страница 79: ...st addrlist Clear multiple devices EnableLocal addrlist Enable local control EnableRemote addrlist Enable remote control FindLstn addrlist v Find all Listeners FindRQS addrlist Find device asserting S...

Страница 80: ...tatus word ibsta in two forms a hex value in square brackets and a list of mnemonics in parentheses In the following example the status word is on the second line It shows that the device function wri...

Страница 81: ...2 routine is called Refer to the function descriptions in the NI 488 2M Function Reference Manual for Windows NT for the correct interpretation of the count return Common NI 488 Functions ibfind Use t...

Страница 82: ...as shown in the following example ibdev enter board index 0 enter primary address 6 enter secondary address 0x67 enter timeout 13 enter EOI on last byte flag 1 enter end of string mode byte 0 id 32256...

Страница 83: ...ta from one GPIB device to another For example to send the six character data string F3R5T1 from the computer to a device called dev1 you enter the following string at the dev1 prompt as shown in the...

Страница 84: ...17 To do this enter the SendList command at the 488 2 0 prompt as shown in the following example 488 2 0 SendList 2 17 IDN NLend 0128 cmpl cic tacs count 6 The returned status word contains the cmpl...

Страница 85: ...If you do not enter an option a menu of options appears Repeat previous function Turn OFF display Turn ON display n function Execute function n times where function represents the correct ibic functio...

Страница 86: ...rt Help describes the function syntax for all NI 488 functions and NI 488 2 routines Repeat Previous Function The function repeats the most recent function executed The following example issues an ibs...

Страница 87: ...sent 5 times 20 times and then 10 more times ud0 5 ibwrt Hello ud0 20 ud0 10 Notice that the multiplier does not become part of the function name that is ibwrt Hello is repeated 20 times not 5 ibwrt H...

Страница 88: ...use the print function to echo a string to the screen The following example shows how you can use ASCII or hex with the print command dev1 print hello hello dev1 print and r n x67 x6f x6f x64 x62 x79...

Страница 89: ...s function to enable disable or configure the EOS modes EOS mode configuration includes the following information A 7 bit or 8 bit EOS byte EOS comparison method This indicates whether the EOS byte ha...

Страница 90: ...e ibconfig function option IbcHSCableLength The value passed to ibconfig should specify the number of meters of cable in your GPIB configuration If you specify a cable length that is much smaller than...

Страница 91: ...connected by four meters of cable Waiting for GPIB Conditions You can use the ibwait function to obtain the current ibsta value or to suspend your application until a specified condition occurs on th...

Страница 92: ...following paragraphs describe some programming techniques for Talker Listener applications Waiting for Messages from the Controller A Talker Listener application typically uses ibwait with a mask of 0...

Страница 93: ...PIB devices when they request service When the GPIB SRQ line is asserted it signals the Controller that a service request is pending The Controller must then determine which device asserted the SRQ li...

Страница 94: ...sp function ibrsp returns the first queued response Other responses are read in first in first out FIFO fashion If the RQS bit of the status word is not set when ibrsp is called a serial poll is condu...

Страница 95: ...properly if interrupts are disabled SRQ and Serial Polling with NI 488 Device Functions You can use the device level NI 488 function ibrsp to conduct a serial poll ibrsp conducts a single serial poll...

Страница 96: ...til it finds a device that is requesting service or until it has polled all of the devices on the list The routine returns the index and status byte value of the device requesting service TestSRQ dete...

Страница 97: ...d n FindRQS 0 AddrList SerialPollResponse if ibsta ERR printf Device at pad x returned byte x n AddrList ibcnt int SerialPollResponse DevicePad AddrList ibcnt DeviceResponse SerialPollResponse return...

Страница 98: ...ler and must configure itself for a parallel poll and set its own individual status bit ist Parallel Polling with NI 488 Functions Follow these steps to implement parallel polling using NI 488 functio...

Страница 99: ...ng example the GPIB board is to configure itself to participate in a parallel poll It asserts DIO5 when ist 1 if a parallel poll is conducted ibppc 0 0x6C ibist 0 1 2 Conduct the parallel poll using i...

Страница 100: ...m checks bit 4 hex 10 in the response to determine the value of ist PPoll 0 response If response has bit 4 hex 10 set the ist bit of the device at that time is equal to 1 If it does not appear the ist...

Страница 101: ...config function in your application program If your application program uses ibconfig whenever it needs to modify a configuration option it is able to run on any computer with the appropriate NI 488 2...

Страница 102: ...ur new settings If ibconf cannot unload the software because it is being used by another application it instructs you either to exit all GPIB related applications and click Restart again or to shut do...

Страница 103: ...B you must use the Micro Channel configuration program that came with your computer to modify many of the hardware settings for your board Figure 7 2 shows the board configuration dialog box for the A...

Страница 104: ...scard any configuration changes made to the board and return to the main dialog box Help Use this button or the F1 key to bring up help for this dialog box Software Use this button to expand the board...

Страница 105: ...r to the getting started manual that came with your GPIB interface board Use Demand Use this item to select the DMA transfer mode that the NI 488 2M Mode DMA software uses When this item is selected t...

Страница 106: ...boards must be assigned a unique primary address This Address address a number in the range 0 to 30 decimal is used by the NI 488 2M software to compute the talk and listen addresses of the board The...

Страница 107: ...en the NI 488 2M software is being used to control a GPIB system the GPIB interface board should normally be the System Controller Some situations such as a network of computers require that the inter...

Страница 108: ...his option is not selected Assert REN When this option is selected and the interface board is the System When SC Controller the GPIB Remote Enable REN line is automatically asserted any time a device...

Страница 109: ...nded addressing is needed the device should be assigned a Secondary unique secondary address This number must be in the range 96 to 126 Address decimal If extended addressing is not required select No...

Страница 110: ...ction waits for an event before returning The default timeout period is 10 s Serial Poll Use this option to select the length of time the NI 488 2M software Timeout waits for a serial poll response fr...

Страница 111: ...board calls brd or both dev brd The following table shows the status word layout Table A 1 Status Word Bits Mnemonic Bit Pos Hex Value Type Description ERR 15 8000 dev brd GPIB error TIMO 14 4000 dev...

Страница 112: ...byte has been received if the software is configured to terminate a read on an EOS byte If the GPIB board is performing a shadow handshake as a result of the ibgts function any other function can ret...

Страница 113: ...r immediately following a call to ibrsv EVENT brd Use EVENT in Talker Listener applications applications in which the GPIB interface is not the Controller to monitor the order of GPIB device clear gro...

Страница 114: ...stem Controller or when the GPIB board passes control to another device ATN brd ATN indicates the state of the GPIB Attention ATN line ATN is set whenever the GPIB ATN line is asserted and it is clear...

Страница 115: ...wait call if the DTAS bit is set in the ibwait mask parameter DCAS brd DCAS indicates whether the GPIB board has detected a device clear command DCAS is set whenever the GPIB board detects that the De...

Страница 116: ...not System Controller as required EABO 6 I O operation aborted timeout ENEB 7 Nonexistent GPIB board EOIP 10 Asynchronous I O in progress ECAP 11 No capability for operation EFSO 12 File system error...

Страница 117: ...more information Use the unit descriptor returned from ibdev or ibfind as the first parameter in subsequent NI 488 functions Examine the variable before the failing function to make sure the function...

Страница 118: ...priate hex code in ibcmd to address your device Check your cable connections and make sure at least two thirds of your devices are powered on Call ibpad or ibsad if necessary to match the configured a...

Страница 119: ...NI 488 2 routine called with an invalid address PPollConfig called with an invalid data line or sense bit Solutions Make sure that the parameters passed to the NI 488 function or NI 488 2 routine are...

Страница 120: ...plugged into the system the I O address specified during configuration does not match the actual board setting or there is a system conflict with the base I O address Solutions Make sure there is a GP...

Страница 121: ...ded capability EFSO 12 EFSO results when an ibrdf or ibwrtf call encounters a problem performing a file operation Specifically this error indicates that the function is unable to open create seek writ...

Страница 122: ...Disable autopolling with the ibconfig function or the ibconf utility ESRQ 16 ESRQ occurs only during the ibwait function or the WaitSRQ routine ESRQ indicates that a wait for RQS is not possible beca...

Страница 123: ...old all the addresses of the Listeners found In the case of FindRQS ETAB means that none of the devices in the given table were requesting service In the case of ibevent ETAB means the event queue ove...

Страница 124: ...fax questions to us at any time Corporate Headquarters 512 795 8248 Technical support fax 800 328 2203 512 794 5678 Branch Offices Phone Number Fax Number Australia 03 9 879 9422 03 9 879 9179 Austria...

Страница 125: ...s engineers answer your questions more efficiently If you are using any National Instruments hardware or software products related to this problem include the configuration forms from their user manua...

Страница 126: ...National Instruments software product Version Configuration The problem is List any error messages The following steps will reproduce the problem...

Страница 127: ...umentation supplied with our products This information helps us provide quality products to meet your needs Title NI 488 2M User Manual for Windows NT Edition Date January 1996 Part Number 320646B 01...

Страница 128: ...d describe the errors Thank you for your help Name Title Company Address Phone Mail to Technical Publications National Instruments Corporation 6504 Bridge Point Parkway Austin TX 78730 5039 Fax to Tec...

Страница 129: ...devices on the bus that are attached to it ANSI American National Standards Institute ASCII American Standard Code for Information Interchange asynchronous An action or event that occurs at an unpred...

Страница 130: ...sed to reset the device or internal Device Clear functions of all devices See SDC device level function A function that combines several rudimentary board operations into one function so that the user...

Страница 131: ...in ANSI IEEE Standard 488 1 1987 and ANSI IEEE Standard 488 2 1987 GPIB address The address of a device on the GPIB composed of a primary address MLA and MTA and perhaps a secondary address MSA The G...

Страница 132: ...B devices troubleshoot problems and develop your application ibsta At the end of each function call this global variable status word contains status information IEEE Institute of Electrical and Electr...

Страница 133: ...V The Message Available bit is part of the IEEE 488 2 defined status byte which is received from a device responding to a serial poll MB Megabytes of memory memory resident Resident in RAM MLA A GPIB...

Страница 134: ...sed Parallel Poll Disable to disable a configured device from participating in polls There are 16 PPD commands PPE Parallel Poll Enable is the GPIB command used Parallel Poll Enable to enable a config...

Страница 135: ...Serial Poll Disable SPE The GPIB command used to enable a specific device to be Serial Poll Enable polled That device must also be addressed to talk See SPD SRQ Service Request The GPIB line that a de...

Страница 136: ...prevents I O functions from hanging indefinitely when there is a problem on the GPIB TLC An integrated circuit that implements most of the GPIB Talker Listener and Controller functions in hardware U u...

Страница 137: ...ring mode 2 8 to 2 9 non controller example 2 20 to 2 21 parallel polls 2 18 to 2 19 serial polls using NI 488 2 routines 2 16 to 2 17 service requests 2 10 to 2 13 source code files 2 1 choosing betw...

Страница 138: ...processing of data 3 16 program shell illustration 3 12 reading measurements 3 16 triggering instruments 3 15 waiting for measurements 3 15 to 3 16 NI 488 2 routines choosing between NI 488 functions...

Страница 139: ...ondition bit position hex value and type table 3 4 description A 4 clearing and triggering devices example 2 4 to 2 5 CMPL status word condition bit position hex value and type table 3 4 description A...

Страница 140: ...table 1 3 DCAS status word condition bit position hex value and type table 3 4 description A 5 using event queue 6 4 to 6 5 waiting for messages from Controller 6 4 debugging common questions 4 6 to 4...

Страница 141: ...applications programming Devices applet Windows NT 4 1 direct access to NI 488 2 dynamic link library compiling linking and running applications 3 17 to 3 19 requirements 3 1 DMA configuring with ibc...

Страница 142: ...EDVR error code definition table 4 4 description B 1 to B 2 ibic example 5 11 EFSO error code definition table 4 4 description B 6 end of string character See EOS END status word condition bit positi...

Страница 143: ...and type table 3 4 description A 2 error codes and solutions EABO B 4 to B 5 EADR B 3 EARG 5 12 B 4 EBUS B 6 to B 7 ECAP B 6 ECIC B 2 EDVR 5 11 B 2 EFSO B 6 ENEB 5 10 B 5 ENOL B 3 EOIP B 5 to B 6 ESAC...

Страница 144: ...9 functions See auxiliary functions ibic NI 488 functions G General Purpose Interface Bus See GPIB global variables 3 3 to 3 6 count variables ibcnt and ibcntl 3 5 to 3 6 debugging applications 4 3 e...

Страница 145: ...nfiguration effects 6 3 parallel polling 6 10 to 6 12 implementing 6 10 to 6 12 using NI 488 functions 6 10 to 6 11 using NI 488 2 routines 6 11 to 6 12 serial polling 6 5 to 6 9 automatic serial poll...

Страница 146: ...ion 7 9 Assert REN When SC option 7 8 Base I O Address option 7 4 board configuration dialog box illustration 7 3 Bus Timing option 7 4 Cable Length for High Speed option 7 4 Cancel button 7 4 device...

Страница 147: ...PIB driver 4 5 determining assertion of EOI line 6 2 enabling autopolling 6 6 enabling EVENT bit 6 4 to 6 5 enabling high speed data transfers 6 2 to 6 3 ibdev function conducting parallel polls 6 11...

Страница 148: ...nctions 5 5 to 5 7 NI 488 2 routines 5 8 to 5 9 numbers 5 4 strings 5 5 ibonl function placing board offline 3 17 placing device offline 3 10 using in ibic example 5 4 ibppc function conducting parall...

Страница 149: ...ic utility interface management lines 1 3 Interrupt Level option ibconf utility 7 5 interrupts and autopolling 6 7 L LACS status word condition bit position hex value and type table 3 4 description A...

Страница 150: ...y functions ibic parallel polling 6 10 to 6 11 programming considerations advantages of using 3 2 board functions 3 2 to 3 3 choosing between functions and routines 3 1 to 3 3 device functions 3 2 whe...

Страница 151: ...8 2 routines C language files 1 7 DOS and 16 bit Windows support files 1 7 driver and driver utility files 1 6 to 1 7 interaction with Windows NT 1 8 reloading NI 488 2M driver 1 9 unloading NI 488 2M...

Страница 152: ...at function n times n function ibic 5 16 repeat previous function function ibic 5 15 requesting service See service requests routines See NI 488 2 routines RQS status word condition bit position hex v...

Страница 153: ...5 14 to 5 15 setting up your system See configuration software See NI 488 2M software SPOLL bit 6 5 SPOLL status word condition bit position hex value and type table 3 4 description A 3 SRQ service r...

Страница 154: ...4 to 6 5 requesting service 6 5 waiting for messages from Controller 6 4 Talkers 1 1 technical support C 1 Terminate read on EOS option ibconf utility 7 9 termination methods errors caused by 4 6 term...

Страница 155: ...ction WaitSRQ routine conducting serial polls 6 8 waiting for measurement 3 15 to 3 16 Windows 16 bit GPIB applications 3 20 Windows 16 bit support files 1 7 Windows NT examining NT devices to verify...

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