GPIB-130 User Manual - National Instruments
Contents
1. A 2 Handshake Limes A 2 Not Ready For Data A 2 Not Data Accepted NDAC A 3 Valid IG QR REDE RHOD CU SEE A 3 Interface Management Die eadeni A 3 Attention edere EE dpa tec 3 Intertace Clear ANA KINANG tme o TEES A 3 Remote Enable REN 3 Service Request SR SE aa A 3 End Or Identify BO 7 A 3 Physical and Electrical Characteristics A 4 Configuration Requirements 7 7 Appendix NA AA AA B 1 System Confis ra agite deal B 1 Performance 1 Operating Characteristics 2 Bleettical Characteristic S a Daanan ANA B 2 Environmental Characteristics naina B 2 Physical Characteristles 2 Appendix Cable Assembly Wire List 1 Appendix Multiline Interface Messages 222222 2 4 0000000000000032 D 1 Appendix E Customer Communication sse E 1 VOSS Ysa li teat c M LE Re E Glossary 1 GPIB 150 User Manual vi National Instruments Corporation Contents Figures Figure 1 1 The Model GPIB 130 Bus Bxtender iiie2. Qiu 3 DIOS DIO6 DIO7 DIO8 REN GND twisted with DAV GND twisted with NRFD GND twisted with NDAC GND twisted with IFC GND twisted with SRQ GND twisted with ATN Signal Ground 13 6 18 Shield KEN NIN BIW lo Figure A 1 GPIB Connector and the Signal Assignment GPIB 130 User Manual A 4 National Instruments Corporation Appendix Operation of the GPIB Device C Figure A 2 Linear Configuration National Instruments Corporation 5 GPIB 130 User Manual Operation of the GPIB Appendix A Tm la Figure 3 Star Configuration GPIB 130 User Manual A 6 National Instruments Corporation Appendix Operation of the GPIB Configuration Requirements To achieve the high data transfer rate that the GPIB was designed for the physical distance between devices and the number of devices on the bus are limited The following restrictions are typical maximum separation of four meters between any two devices and an average separation of two meters over the entire bus maximum total cable length of 20 m e Nomore than 15 devices connected to each bus with at least two thirds powered on Bus extenders are available from National Instruments for use when these limits must be exceeded Related Document For more information on topics covered in this section consult ANSI IEEE Standard 488 1 1987 IEEE Standard Digital Interface for Pro
3. 000 0 001 1 002 2 003 3 004 4 005 5 006 6 007 7 010 8 011 9 012 10 013 11 014 12 015 13 016 14 017 15 020 16 021 17 022 18 023 19 024 20 025 21 026 22 027 23 030 24 031 25 032 26 033 27 034 28 035 29 036 30 037 31 Device Clear Appendix D Multiline Interface Messages ASCII NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT CR SO SI DLE DCI DC2 DC3 DC4 NAK SYN ETB Group Execute Trigger Go To Local Local Lockout My Listen Address GPIB 130 User Manual Msg GTL SDC PPC GET TCT LLO DCL PPU SPE SPD Hex Oct 20 040 21 041 22 042 23 043 24 044 25 045 26 046 27 047 28 050 29 051 2A 052 2B 053 2C 054 2D 055 2E 056 2F 057 30 060 31 061 32 062 33 063 34 064 35 065 36 066 37 067 38 070 39 071 3A 072 3B 073 3C 074 3D 075 3E 076 3F 077 MSA MTA PPC PPD Dec ASCII Msg 32 SP MLAO 33 MLAI 34 MLA2 35 MLA3 36 MLA4 27 MLAS 38 amp MLA6 39 MLA7 40 MLA8 41 MLA9 42 d MLAIO 43 MLAI11 44 j MLA12 45 MLA13 46 MLA14 47 15 48 0 16 49 1 MLA17 50 2 18 51 3 MLA19 52 4 MLA20 53 5 MLA21 54 6 MLA22 55 7 MLA23 56 8 MLA24 57 9 MLA25 58 MLA26 59 MLA27 60 lt MLA28 61 MLA29 62 gt MLA30 63 UNL My Secondary Address My Talk Address Parallel Poll Configure Parallel Poll Disable National Instruments Corporation Appendix PPU SDC SPD Multiline Interf
4. Maximum sustained transfer rates assuming 1 Mbytes sec transfer rate without extenders GPIB 130 User Manual National Instruments Corporation Appendix Specifications Operating Characteristics Architecture point to point not multi drop transmission Operating modes Buffered mode or Unbuffered interlocked mode Parallel Poll Response modes Immediate Parallel Poll Response mode or Stored Parallel Poll Response mode Electrical Characteristics GPIB interface circuit tri state drivers SN75ALS160 SN75ALS162 Transmission interface circuit RS 422 drivers and receivers connected with parallel data transmission cable GPIB interface load one standard load AC and DC Power 2 2 W typical Environmental Characteristics Operating temperature 0 to 55 Humidity 5 to 95 non condensing conditions FCC Class A verified Physical Characteristics Case dimensions 3 75 x 3 0 x 0 95 in 95 x 76 x 24 mm Case material 0 050 in THK 5052 H32 Aluminum Rack mountin Contact factory for information g y GPIB cable IEEE 488 standard 24 pin Transmission cables NEC CL2 and CL2P Plenum rated cables available with AMP Amplimite connectors AMP HDP 20 50 pin connector with RFI EMI shield National Instruments Corporation B 3 GPIB 130 User Manual Appendix Cable Assembly Wire List This appendix contains the wire list for the GPIB 130 Transmission Cable Table C 1 Cable Assembly Wire List Connector P2A Connector
5. The GPIB 130s remain in the PON state until the transmission cable is properly connected to both GPIB 130s In the PON state all state machines and FIFOs are cleared No GPIB lines are asserted by the GPIB 130 in the PON state National Instruments Corporation 4 1 GPIB 150 User Manual Theory of Operation Chapter 4 When the GPIB 130s leave the PON state the Link LED turns on and the extension system becomes operational System Controller Detection The System Controller Detection circuitry locates the GPIB System Controller if one is present in the system The System Controller may be on either the local side or the remote side of the GPIB 130 extension The ANSI IEEE Standard 488 1 1987 restricts a GPIB system to having only one System Controller However the GPIB 130s work in systems that have more than one System Controller A GPIB device should assert the Interface Clear IFC message to become the System Controller Controller In Charge Detection The Controller In Charge CIC Detection circuitry locates the GPIB Controller In Charge if one is present in the system The GPIB Controllers may be on the local side the remote side or both sides of the GPIB 130 extension Devices on one side of the extension system may pass control or take control from devices on the remote side of the extension Source Handshake Detection The Source Handshake Detection circuitry locates the device sourcing GPIB command or data bytes Command
6. 14 089 714 60 35 02 48301915 03 3788 1923 03480 30673 32 848600 91 640 0533 08 730 43 70 056 27 00 25 0635 523154 GPIB 130 User Manual Technical Support Form Photocopy this form and update it each time you make changes to your software or hardware and use the completed copy of this form as a reference for your current configuration Completing this form accurately before contacting National Instruments for technical support helps our applications 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 manuals Include additional pages if necessary Name Company Address Fax Phone Computer brand Model Processor Operating system Speed MHz RAM M Display adapter Mouse yes no Other adapters installed Hard disk capacity M Brand Instruments used National Instruments hardware product model Revision Configuration National Instruments software product Version Configuration The problem is List any error messages The following steps will reproduce the problem GPIB 130 Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line to the right of each item Complete a new copy of this form each time you revise yo
7. EOI FCC FIFO GPIB IDY TEEE ISO kbytes LED NDAC NRFD OZ PON percent degrees greater than greater than or equal to less than less than or equal to amperes alternating current American National Standards Institute American Standard Code for Information Interchange Attention Celsius Controller In Charge central processing unit Data Valid direct current Data Input Output End Or Identify Federal Communications Commission first in first out Ground General Purpose Interface Bus Identify Institute of Electrical and Electronic Engineers Interface Clear International Standards Organization 1 000 bytes light emitting diode meters megabytes of memory Not Data Accepted National Electrical Code Not Ready For Data ounces Power On National Instruments Corporation Glossary 1 GPIB 130 User Manual Glossary PPR REN sec SRQ TIL V VAC VDC W Parallel Poll Parallel Poll Response Remote Enable seconds Service Request transistor transistor logic volts volts alternating current volts direct currect watts GPIB 130 User Manual Glossary 2 National Instruments Corporation
8. P2B DIO1 44 1 DIO1 44 DIOL 43 DIOL 43 DIO2 34 2 DIO2 34 DIO2 41 DIO2 41 DIO3 3 DIO3 DIO3 DIO3 DIO4 36 DIO4 36 DIO4 39 DIO4 39 DIO5 42 DIO5 42 DIO5 18 DIO5 18 DIO6 45 DIO6 45 DIO6 46 DIO6 46 DIO7 40 7 DIO7 40 DIO7 35 DIO7 35 DIO8 37 DIO8 37 DIO8 38 DIO8 38 BUS SRQ 30 BUS SRQ 30 BUS SRQ 32 BUS SRQ 32 BUS REN 14 10 BUS REN 14 BUS REN 15 BUS REN 15 BUSPP 16 11 BUSPP 16 BUSPP 17 BUSPP 17 XIFC 29 12 RIFC 31 XIFC 12 RIFC 33 RIFC 31 13 XIFC 29 RIFC 33 XIFC 12 continues National Instruments Corporation C 1 GPIB 130 User Manual Cable Assembly Wire List Appendix C Table C 1 Cable Assembly Wire List continued Connector P2A Connector P2B 27 14 XATN RATN XATN 11 XRFD 21 XRFD XPON XPON RATN RATN RPON RPON SHIELD GPIB 130 User Manual C2 National Instruments Corporation Appendix Multiline Interface Messages This section contains an interface message reference list which describes the mnemonics and messages that correspond to the interface functions These multiline interface messages are sent and received with ATN TRUE For more information on these messages refer to the ANSI IEEE Standard 488 837 IEEE Standard Digital Interface for Programmable Instrumentation National Instruments Corporation D 1 GPIB 150 User Manual Multiline Interface Messages Message Definitions DCL GET GTL LLO MLA Oct Dec
9. 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 or safeguard human health and safety in medical or clinical treatment FCC DOC Radio Frequency Interference 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 This equipment has been tested and found to comply with the following two regulatory agencies Federal Communications Commission This device complies with Part 15 of the Federal Communications Commission FCC Rules for a Class A digital device Operation is subject to the following two conditions 1 This device may not cause harmful interference in commercial environments 2 This device must accept any interference received including interference that may cause undesired operation Canadian Department of Communications This device complies with the limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications DOC Le pr sent appareil num rique n miet pas de bruits radio lectriques d passant les limites applicables aux appareils nu
10. bytes may be sourced by the CIC data bytes may be sourced by the addressed GPIB Talker One or more devices in the system may be addressed as GPIB Listeners Listeners may be on the same side the opposite side or both sides of the GPIB 130 extension Parallel Poll Detection The Parallel Poll Detection circuitry determines when the CIC is conducting a parallel poll The GPIB 130 responds to parallel polls according to the Parallel Poll Response PPR mode chosen by the position of switch 2 see the Parallel Poll Response PPR Modes section in Chapter 3 Devices on both sides of the extension may respond to parallel polls FIFO Controller The FIFO Controller manages data flow into and out of the GPIB 130 s FIFO For long data streams you can obtain a much higher data throughput with Buffered mode than with Unbuffered mode The FIFO Controller remains inactive unless a device is sourcing data bytes and the GPIB 130 is configured to be in Buffered mode See the Operating Modes section in Chapter 3 Each GPIB 130 contains a FIFO and the FIFO Controller circuitry so GPIB Talkers on both sides of the extension can use Buffered mode GPIB 130 User Manual 4 2 National Instruments Corporation Appendix Operation of the GPIB Communication among interconnected GPIB devices is achieved by passing messages through the interface system Types of Messages The GPIB carries device dependent messages and interface messages e Device d
11. 0 complete the following steps Caution Failure to follow these steps for installation may result in damage to your GPIB 130 and your system 1 Make sure that the power switch on the side panel is in the off position 2 Inspect the power supply to confirm that it is compatible with the line voltage available from the wall outlet 3 Push the phono jack connector of the external power supply into 5VDC jack of the GPIB 130 4 Turn the phono jack connector so that it screws into the threading on the 5VDC jack 5 Plug the power supply into the wall outlet 6 Connect the transmission cable to both GPIB 130s 7 Slide the power switch of both extenders to the on position The GPIB 130 extension is now operational Connecting to a Specially Configured GPIB Interface Board To connect the GPIB 130 to a specially equipped National Instruments GPIB interface board complete the following steps Caution Failure to follow these steps for installation may result in damage to your GPIB 130 and your system 1 Make sure that the power switch on the side panel is in the off position 2 Turn off the computer containing the interface board 3 Unplug the power cord of the computer 4 Push either phono jack connector of the special power cord into the 5VDC jack of the GPIB 130 5 Turn the phono jack connector so that it screws into the threading on the 5VDC jack on the GPIB 130 GPIB 150 User Manual 2 2 National Instruments
12. A16 PPD MSA17 PPD MSA18 PPD MSA19 PPD MSA20 PPD MSA21 PPD MSA22 PPD MSA23 PPD MSA24 PPD MSA25 PPD MSA26 PPD MSA27 PPD MSA28 PPD MSA29 PPD MSA30 PPD GPIB 130 User Manual Appendix E Customer Communication For your convenience this appendix contains forms to help you gather the information necessary to help us solve technical problems you might have as well as a form you can use to comment on the product documentation Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster National Instruments provides comprehensive technical assistance around the world In the U S and Canada applications engineers are available Monday through Friday from 8 00 a m to 6 00 p m central time In other countries contact the nearest branch office You may 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 Australia 03 879 9422 Austria 0662 435986 Belgium 02 757 00 20 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 00 Germany 089 741 31 30 Italy 02 48301892 Japan 03 3788 1921 Netherlands 03480 33466 Norway 32 848400 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 U K 0635 523545 National Instruments Corporation 1 Fax Number 03 879 9179 0662 437010 19 02 757 03 11 45 76 71 11 90 502 2930 1 48 14 24
13. Corporation Chapter 2 Connection 6 Push the other phono jack connector of the special power cord into the 5VDC jack of the National Instruments interface board 7 Turn the phono jack connector so that it screws into the threading on the 5VDC jack on the interface board 8 Plug in the power cord of the computer and turn on the computer 9 Connect the transmission cable to both GPIB 130s 10 Slide the power switch of both extenders to the on position The GPIB 130 extension is now operational Connecting to Hewlett Packard Controllers To achieve very high data transfer rates and long cable spans between devices many HP Controllers and computers such as the 64000 series use a preload technique on the unit designated Master Controller When preloaded the GPIB lines of the Master Controller are terminated to represent six device loads HP has two types of preloading Class A in which all 16 GPIB lines are loaded and Class B in which all lines except NRFD and NDAC lines are loaded Preloading increases ringing on signal transitions and can cause improper operation of the GPIB 130s If this happens set all signals on the Master Controller to normal 1 unit load This is done using a back panel switch on your HP Controller In addition you must also strictly conform to the cabling rule of no more than two meters per device National Instruments Corporation 2 3 GPIB 150 User Manual Chapter 3 Configuration and Operation
14. GPIB 130 User Manual November 1993 Edition Part Number 370897A 01 Copyright 1991 1994 National Instruments Corporation All Rights Reserved National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin TX 78730 5039 512 794 0100 Technical support fax 800 328 2203 512 794 5678 Branch Offices Australia 03 879 9422 Austria 0662 435986 Belgium 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 Italy 02 48301892 Japan 03 3788 1921 Netherlands 03480 33466 Norway 32 848400 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 U K 0635 523545 Limited Warranty The GPIB 130 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 option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor 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 do
15. This chapter describes how to configure and operate a GPIB 130 system Operating Modes The GPIB 130 has two operating modes Unbuffered mode and Buffered mode The operating mode determines how data is transmitted across the extension Both units in the extension system must be set to the same mode Unbuffered Mode In Unbuffered mode each data byte is transmitted using the GPIB double interlocked handshaking protocol For long data streams transfers using Unbuffered mode are slower than transfers using Buffered mode However the GPIB extension is transparent in Unbuffered mode Buffered Mode In Buffered mode the GPIB 130 uses FIFOs to buffer data between the remote and local units For long data streams you can obtain a much higher data throughput with Buffered mode than with Unbuffered mode Consider the following situation a GPIB device on the local side of the extension is addressed to talk another device on the remote side is addressed to listen When the talking device sources data bytes the GPIB 130s accept the data bytes and store them in a FIFO At the same time the GPIB 130s read data from the FIFO and source data bytes to the Listener Whenever the FIFO contains data the number of bytes sourced by the Talker differs from the number of bytes accepted by the Listener A few applications may not operate properly in Buffered mode GPIB command bytes are not stored in the FIFOs they are transmitted using the GPIB double int
16. a data message it connects the caller Talker to the receiver Listener The Controller addresses a Talker and a Listener before the Talker can send its message to the Listener After the message is transmitted the Controller may unaddress both devices Some bus configurations do not require a Controller For example one device may always be a Talker called a Talk only device and there may be one or more Listen only devices National Instruments Corporation 1 GPIB 130 User Manual Operation of the GPIB Appendix A A Controller is necessary when the active or addressed Talker or Listener must be changed The Controller function is usually handled by a computer With the GPIB interface board and its software your personal computer plays all three roles e Controller to manage the GPIB e Talker to send data e Listener to receive data The Controller In Charge and System Controller Although there can be multiple Controllers on the GPIB only one Controller at a time is active or Controller In Charge CIC Active control can be passed from the current CIC to an idle Controller Only one device on the bus the System Controller can make itself the CIC The GPIB interface board is usually the System Controller GPIB Signals and Lines The interface system consists of 16 signal lines and 8 ground return or shield drain lines The 16 signal lines are divided into the following three groups Fight data lines e Three han
17. ace Messages Multiline Interface Messages Oct Dec ASCII 100 64 101 65 A 102 66 B 103 67 C 104 68 D 105 69 E 106 70 107 71 G 110 72 H 111 73 I 112 74 J 113 75 114 76 L 115 77 M 116 78 N 117 79 O 120 80 P 121 81 Q 122 82 R 123 83 S 124 84 T 125 85 U 126 86 V 127 87 W 130 88 X 131 89 Y 132 90 Z 133 91 134 92 135 93 136 94 A 137 95 _ Parallel Poll Enable Parallel Poll Unconfigure Selected Device Clear Serial Poll Disable National Instruments Corporation Msg MTAO 1 MTA2 MTA3 MTA4 MTAS MTA6 MTA7 MTA8 MTA9 MTAIO MTAII MTA12 MTA13 MTA14 MTAI5 MTA16 MTA17 MTA18 MTA19 MTA20 21 22 23 24 25 26 27 28 29 0 Hex Oct 60 140 61 141 62 142 63 143 64 144 65 145 66 146 67 147 68 150 69 151 6A 152 6B 153 6C 154 6D 155 6E 156 6F 157 70 160 71 161 72 162 73 163 74 164 75 165 76 166 77 167 78 170 79 171 TA 172 7B 173 7C 174 7 175 75 176 177 SPE TCT UNL UNT D 3 NO ON 104 OBB TAT 00 0 112 2 o 119 120 121 122 123 124 125 lt lt 77 70 127 DEL Serial Poll Enable Take Control Unlisten Untalk ASCII Msg MSAO PPE MSA1 PPE MSA2 PPE MSA3 PPE MSA4 PPE MSAS PPE MSA6 PPE MSA7 PPE MSA8 PPE MSA9 PPE MSA10 PPE MSA11 PPE MSA12 PPE MSA13 PPE MSA14 PPE MSA15 PPE MS
18. cument 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 any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or serv
19. dshake lines Five interface management lines Data Lines The eight data lines DIO1 through DIOS carry both data and command messages All commands and most data use the 7 bit ASCII or ISO code set in which case the eighth bit DIOS is unused or used for parity Handshake Lines Three lines asynchronously control the transfer of message bytes among devices The process is called a three wire interlocked handshake and it guarantees that message bytes on the data lines are sent and received without transmission error Not Ready For Data NRFD NRED indicates when a device is ready or not ready to receive a message byte The line is driven by all devices when receiving commands and by Listeners when receiving data messages GPIB 150 User Manual A 2 National Instruments Corporation Appendix Operation of the GPIB Not Data Accepted NDAC NDAC indicates when a device has or has not accepted a message byte The line is driven by all devices when receiving commands and by Listeners when receiving data messages Data Valid DAV DAV tells when the signals on the data lines are stable valid and can be accepted safely by devices The Controller drives DAV when sending commands and the Talker drives it when sending data messages Interface Management Lines Five lines are used to manage the flow of information across the interface Attention ATN The Controller drives ATN true when it uses the data lines to send command
20. e GPIB 130 User Manual 3 2 National Instruments Corporation Chapter 3 Configuration and Operation Stored PPR Mode Approach 1 In the stored PPR mode the GPIB 130s use an internal PPR data register When a Controller on the local GPIB system asserts IDY the local GPIB 130 extender responds by outputting the contents of the PPR data register to the local GPIB data lines At the same time a parallel poll message is sent to the remote bus When the local IDY signal is unasserted the PPR from the remote system is loaded into the internal PPR data register Consequently the register always contains the response of the previous complete poll To obtain the response of both local and remote GPIB systems the control program executes two parallel polls back to back and uses the second response The software driver library of most Controllers contains an easy to use parallel poll function If for example the function is called ibrpp and the control program is written in BASIC the sequence to conduct a poll in Stored PPR mode might be similar to the following sequence CALL ibrpp brd0 pprs CALL ibrpp brd0 pprs IF ppr gt 0 GOTO 300 Immediate PPR Mode Approach 2 In this mode the GPIB 130s do not use the internal PPR data register When a Controller on the local GPIB system asserts IDY the local GPIB 130 extender sends the IDY message to the remote bus and the response is returned as fast as propagation delays permit The C
21. emote GPIB system If no Controllers are physically connected to one of the GPIB 130s the PPR mode of that GPIB 130 has no effect on the system Setting the PPR Mode Use switch position 2 on the side of each GPIB 130 to set the PPR mode Slide the switch to the up position to set Immediate PPR mode slide the switch down to set Stored PPR mode See Figure 3 2 ffered cea Imm ffered PPoll Stored PPoll position gt PPoll Imm ll Buffer position PPoll Stored A Immediate PPR Mode Default B Stored PPR Mode Figure 3 2 Switch Setting for Parallel Poll Response PPR Mode Operating the GPIB 130 System The GPIB 130 extension system is fully operational when power is applied to both units In some systems it is necessary to power on the System Controller device last after the extenders and all other devices are operating This power on sequence is necessary if the System Controller executes only one IFC shortly after power on The GPIB 130 has four indicator LEDs on the top of the box labeled Power Link Talk and Listen Power LED The Power LED is lit whenever power is applied to the GPIB 130 and the power switch on the side of the box is in the on position GPIB 130 User Manual 3 4 National Instruments Corporation Chapter 3 Configuration and Operation Link LED The Link LED is lit whenever both GPIB 130s are powered on and the transmission cable is properly connected to both extenders During o
22. ependent messages often called data or data messages contain device specific information such as programming instructions measurement results machine status and data files e Interface messages manage the bus itself They are usually called commands or command messages Interface messages perform such tasks as initializing the bus addressing and unaddressing devices and setting device modes for remote or local programming The term command as used here should not be confused with some device instructions which can also be called commands Such device specific instructions are actually data messages Talkers Listeners and Controllers A Talker sends data messages to one or more Listeners The Controller manages the flow of information on the GPIB by sending commands to all devices Devices can be Listeners Talkers and or Controllers A digital voltmeter for example is a Talker and may be a Listener as well The GPIB is a bus like an ordinary computer bus except that the computer has its circuit cards interconnected via a backplane bus whereas the GPIB has standalone devices interconnected via a cable bus The role of the GPIB Controller can also be compared to the role of the CPU of a computer but a better analogy is to the switching center of a city telephone system The switching center Controller monitors the communications network GPIB When the center Controller notices that a party device wants to make a call send
23. ere is no speed degradation at all for transfers between devices on the same side of the extension Because the GPIB 130 is a functionally transparent extender the same GPIB communications and control programs that work with an unextended system can work unmodified with an extended system There is one minor exception to this transparency in conducting parallel polls as explained in Chapter 3 in the section Parallel Poll Response PPR Modes What Your Kit Should Contain Your GPIB 130 kit should contain the following components GPIB 130 Bus Extender 181460 01 One of the following power supplies 100 120 VAC 5V regulated 700mA 181626 01 or 220 240 VAC 5V regulated 1A 181626 31 GPIB 130 User Manual 320391 01 National Instruments Corporation 1 3 GPIB 130 User Manual Introduction Chapter 1 Optional Equipment Equipment Part Number Transmission Cables xxx length in meters Type T5 NEC CL2 rated up to 50 m 181563 xxx Type T2 NEC CL2 rated 0 m to 300 m 178056 xxx Type T6 NEC CL2P Plenum rated 0 m to 300 m 181564 xxx Type X1 GPIB Cable Single Shielded im 763001 01 2m 763001 02 4m 763001 03 Type X2 GPIB Cable Double Shielded 1m 763061 01 2m 763061 02 4m 76306 1 03 To meet FCC emission limits for this Class A device you must use a shielded Type X1 or X2 GPIB cable Operating this equipment with a non shielded cable may cause interference to radio and televisio
24. erlocked handshaking protocol In most applications the GPIB 130s should be configured in Buffered mode National Instruments Corporation 3 1 GPIB 130 User Manual Configuration and Operation Chapter 3 Setting the Operating Mode Both GPIB 130s in the extension system must be set to the same operating mode Use switch position on the side of each GPIB 130 to set the operating mode Slide the switch to the up position to set Buffered mode slide the switch down to set Unbuffered mode See Figure 3 1 Buffered Unbuffered A Buffered Mode ll PPoll position Buffer position Buffered B Unbuffered Mode Figure 3 1 Switch Setting for Operating Mode Parallel Poll Response PPR Modes According to ANSI IEEE Standard 488 1 1987 devices must respond to a parallel poll within 200 nsec after the Identify IDY message Attention ATN and End Or Identify EOD is asserted by the Controller In Charge CIC The Controller then waits at least 2 usec before reading the Parallel Poll Response PPR In many cases a remote device on an extended system cannot respond to Parallel Polls this quickly because of cable propagation delays The GPIB 130s can solve this problem using one of the following two approaches Approach 1 Respond to IDY within 200 nsec with the results of the previous poll of the remote bus Approach 2 Ignore the 200 nsec rule and assume that the Controller will wait long enough to capture the respons
25. grammable Instrumentation National Instruments Corporation A 7 GPIB 150 User Manual Appendix Specifications This appendix lists the specifications of the GPIB 130 System Configuration Distance per extension Loading per extension Multiple extensions GPIB driver output circuit and T1 timing of source device up to 300 m up to 14 additional devices permitted in any combination of star or linear pattern no restrictions Note is the settling time DIO valid to DAV and varies according to the type of drivers and the system configuration used Performance Characteristics Speed buffered mode Speed unbuffered mode 5m 20m 50m 100m 300 m Functionality Interlocked IEEE 488 handshake National Instruments Corporation 900 kbytes sec maximum 790 kbytes sec maximum 640 kbytes sec maximum 460 kbytes sec maximum 315 kbytes sec maximum 140 kbytes sec maximum transparent GPIB operation except for stored parallel polls maintained across the extension in Unbuffered mode 1 GPIB 130 User Manual Specifications IEEE 488 capability identification codes SHI AHI T5 TES L3 LE3 SRI RLI PP1 2 DC1 DTI 1 5 E2 Appendix B complete Source Handshake complete Acceptor handshake complete Talker complete Listener complete Service Request complete Remote Local complete Parallel Poll complete Device Clear complete Device Trigger complete Controller tri state GPIB drivers
26. ice failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyright laws this publication may not be 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 Trademarks 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
27. m riques de classe A prescrites dans le r glement sur le brouillage radio lectrique dict par le minist re des communications du Canada Instructions to Users These regulations are designed to provide reasonable protection against harmful interference from the equipment to radio reception in commercial areas 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 There is no guarantee that interference will not occur in a particular installation However the chances of interference are much less if the equipment is installed and used according to this instruction manual If the equipment does cause interference to radio or television reception which can be determined by turning the equipment on and off one or more of the following suggestions may reduce or eliminate the problem e Operate the equipment and the receiver on different branches of your AC electrical system e Move the equipment away from the receiver with which it is interfering e Reorient or relocate the receiver s antenna e Be sure that the equipment is plugged into a grounded outlet and that the grounding has not been defeated with a cheater plug Notice 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 If necessary consult National In
28. n reception in commercial areas Unpacking Your GPIB 130 Follow these steps when unpacking your GPIB 130 1 Verify that the pieces contained in the package you received match the kit parts list given earlier in this section 2 Inspect the shipping container and contents for damage If the container is damaged and the damage appears to have been caused in shipment file a claim with the carrier If the equipment is damaged do not attempt to operate it Contact National Instruments for instructions Retain the shipping material for possible inspection by carrier or reshipment of the equipment GPIB 130 User Manual 1 4 National Instruments Corporation Chapter 2 Connection This chapter contains information for connecting your GPIB 130 Connecting the GPIB 130 Figure 2 1 shows a side view of the GPIB 130 Figure 2 1 GPIB 130 Side View The GPIB 130 may be powered on from either an external 5V regulated power supply or from a specially configured National Instruments GPIB interface board National Instruments Corporation 2 1 GPIB 130 User Manual Connection Chapter 2 Connecting an External Power Supply Caution Not for installation in air ducts or plenums For installation in other environmental air handling spaces use only with cable classified by U L Inc as to fire and smoke characteristics in accordance with section 725 2 B of the National Electrical Code To connect an external power supply to the GPIB 13
29. ontroller must allow time to receive the response Choosing the PPR Mode Choosing the right PPR depends on the type of Controllers present in the GPIB system and the length of cable between the GPIB 130s Of course if the control program does not use parallel polls the PPR mode does not matter Many Hewlett Packard GPIB Controllers remain in a parallel poll state with IDY asserted whenever they are not performing another function A change in the response causes an interrupt of the control program In other Controllers the IDY signal is toggled on and off and the duration of the signal can be varied to accommodate delayed responses over extenders When used with these types of Controllers the GPIB 130 should be set to Immediate PPR mode Most other Controllers pulse the IDY signal for about 2 usec and expect a response within that time When used with this type of Controller the GPIB 130 should use the Stored PPR mode if the cable between the extenders is longer than about 60 m For shorter cable distances using the Immediate PPR mode is recommended National Instruments Corporation 3 3 GPIB 150 User Manual Configuration and Operation Chapter 3 Both GPIB 130s in the extension system do not need to be set to the same PPR mode The PPR mode of the local GPIB 130 should be chosen to accommodate the Controllers on the local GPIB system Likewise the PPR mode of the remote GPIB 130 should be chosen to accommodate the Controllers on the r
30. peration the Link LED turns off if the cable is disconnected from either end of the extension or if either GPIB 130 is powered off Talk LED The Talk LED is lit whenever a device on the local GPIB system is identified as a Talker or if a Controller on the local GPIB system is actively asserting the ATN message Whenever the Talk LED of the local GPIB 130 is lit the Listen LED of the remote GPIB 130 is lit Listen LED The Listen LED is lit whenever a device on the remote GPIB system is identified as a Talker or if a Controller on the remote GPIB system is actively asserting the ATN message Whenever the Listen LED of the local GPIB 130 is lit the Talk LED of the remote GPIB 130 is lit National Instruments Corporation 3 5 GPIB 130 User Manual Chapter 4 Theory of Operation This chapter describes how the GPIB 130 circuitry operates This chapter assumes that you have a basic knowledge of the GPIB If you are a first time user or you would like to review the basics refer to Appendix A Operation of the GPIB for a history and the basic operation of the GPIB Figure 4 1 shows a block diagram of the GPIB 130 System 4 77 Controller gt Detection CIC Detection Parallel Source Poll 3 Handshake Detection Detection GPIB Tranceivers RS 422 Transceivers Figure 4 1 GPIB 130 Block Diagram Power On PON State The GPIB 130s enter the Power On PON state when you first turn them on
31. physically separate as shown in Figure 1 2 devices logically appear to be located on the same bus as shown in Figure 1 3 RS 422 Compatible Transmission Lines GPIB 1 GPIB 130 GPIB 130 GPIB 2 8 Computer System Controller Talker and Listener Printer Multimeter Signal Generator Listener Talker and Listener Listener Unit Under Test Figure 1 2 Typical GPIB 130 Extension System Physical Configuration Computer System Controller Talker and Listener Listener Printer Multimeter Signal Generator Talker and Listener Listener Unit Under Test Figure 1 3 Typical GPIB 130 Extension System Logical Configuration GPIB 150 User Manual 1 2 National Instruments Corporation Chapter 1 Introduction With the GPIB 130 it is possible to overcome the following two configuration restrictions imposed by ANSI TEEE Standard 488 1 1987 Acable length limit of 20 m total per contiguous bus or 2 m times the number of devices on the bus whichever is smaller An electrical loading limit of 15 devices per contiguous bus Each GPIB 130 system extends the distance limit by 300 m and the loading limit to 30 devices including the extenders without sacrificing speed or performance These point to point extender systems can be connected in series for longer distances or in star patterns for additional loading The maximum data transfer rate over the extension is 900 kbytes sec Furthermore th
32. rette Lee Petr de A ANG GN NG 1 1 Figure 1 2 Typical GPIB 130 Extension System Physical Configuration 1 2 Figure 1 3 Typical GPIB 130 Extension System Logical Configuration 1 2 Figure 2 1 Side a esci Uie nis a IS a RUE AA 2 1 Figure 3 1 Switch Setting for Operating 3 2 Figure 3 2 Switch Setting for Parallel Poll Response PPR 1006 3 4 Figure 4 1 GPIB 130 Block Diagram iieri rr ERE IR E NER een uS 4 1 Figure A 1 GPIB Connector and the Signal Assignment A 4 Figure A 2 Linear gt A 5 Ligure A 3 Star Config rati n oo eb Une NANA DAA A 6 Table Table C l Cable Assembly WIre Elta oec eter tno ar A eoe ADA 1 National Instruments Corporation vil GPIB 130 User Manual About This Manual This manual describes how to use the National Instruments GPIB 130 bus extender Organization of This Manual This manual is organized as follows Chapter 1 ntroduction contains a description of the GPIB 130 lists the contents of your GPIB 130 kit lists optional equipment and explains how to unpack the GPIB 130 e Chapter 2 Connection contains information for connecting your GPIB 130 e Chapter 3 Configuration and Operation describes how to configure and operate GPIB 130 system e Chapter 4 Theory of Operation describes ho
33. s and false when it allows a Talker to send data messages Interface Clear IFC The System Controller drives the IFC line to initialize the bus and become CIC Remote Enable REN The System Controller drives the REN line which is used to place devices in remote or local program mode Service Request SRQ Any device can drive the SRQ line to asynchronously request service from the Controller with the SRQ line End Or Identify EOI The EOI line has two purposes The Talker uses the EOI line to mark the end of a message string The Controller uses the EOI line to tell devices to identify their response in a parallel poll National Instruments Corporation A 3 GPIB 150 User Manual Operation of the GPIB Appendix A Physical and Electrical Characteristics Devices are usually connected with a cable assembly consisting of a shielded 24 conductor cable with both a plug and receptacle connector at each end This design allows devices to be linked in either a linear or a star configuration or a combination of the two See Figures A 1 A 2 and A 3 The standard connector is the Amphenol or Cinch Series 57 Microribbon or Amp Champ type An adapter cable using a non standard cable and or connector is used for special interconnection applications The GPIB uses negative logic with standard TTL logic level When DAV is true for example it is a TTL low level 0 8V and when DAV is false it is a TTL high level gt 2 0V
34. struments or an experienced radio television technician for additional suggestions The following booklet prepared by the FCC may also be helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington DC 20402 Stock Number 004 000 00345 4 Contents KANAN kUNG PAA t Np vidit ix Organization of This Manual iere seo Gace adiens a pese scidit se Moped Conventions Used in This Manuals eo ed Related X 1 1 1 000 Description of the GPIB 130 7a aaah teri ensi 1 1 What Your Should Contain GA Nas 1 3 Optional Equipment iri o tvi AA et 1 4 Unpacking Your GRUB LAENG PAGA 1 4 2 Ricci M AA 2 1 Connecting the GPIB 130 5 eiie ern GA BISAN Bin URN 2 1 Connecting an External Power Supply mama e ee EI etae eese tuae GNG 2 2 Connecting to a Specially Configured GPIB Interface Board 2 2 Connecting to Hewlett Packard 2 3 Chapter 3 Configuration and Operation sse 3 1 Operating ee eie NAG D GRIN ANG AN UR Vea boe 3 1 Enb ffered Mode tr eas
35. t eeu 3 1 Buffered Mode 3 1 Setting the Operating spese uoo utei td cata IUD ie tats NANGKA BINIGAAN 3 2 Parallel Poll Response PPR Aa 3 2 Stored PPR M de Approach papa ANNA AA ANN ANG 3 3 Immediate PPR Mode Approach 2 3 3 Choosing the PPR Mode op iege Cu 3 3 Setting fne na ad NGAY LO CA AA ioi uio tss e Itu e 3 4 Operating 8 3 4 POWERED NEN eens 3 4 Lank LED E 3 5 Talk EBD su 3 5 Listen LED RANA NANANG BANG NAG 3 5 Chapter 4 Theory of Operation e ob kind Aa ies uU 4 1 Powe OM PON etiam etfi ete tit 4 1 System Controller Detection a i Un 4 2 Controller In Charge Deteetotr ta tue eu bd esit dtt tendat 4 2 Source Handshake Detection 4 4 2 Parallel Poll D tection topo 4 2 4 2 National Instruments Corporation v GPIB 130 User Manual Contents Appendix A Operation of the GPIB Gee ee cedo c i edt A 1 1 Talkers Listeners and Controllers eese 0 A 1 The Controller In Charge and System Controller eee A 2 GPIB Signals and Lines A 2 DALIN eo etos debuts tt eia
36. ur software or hardware configuration and use this form as a reference for your current configuration Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently National Instruments Products GPIB 130 Revision Remote GPIB 130 Revision National Instruments GPIB Interface National Instruments Software Other Products Computer Make and Model Operating System Version Number of GPIB Devices on Bus Other Boards in System GPIB Devices in System 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 GPIB 130 User Manual Edition Date November 1993 Part Number 370897A 01 Please comment on the completeness clarity and organization of the manual If you find errors in the manual please record the page numbers and describe the errors Thank you for your help Name Title Company Address Phone Mail to Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corp 6504 Bridge Point Parkway MS 53 02 MS 53 02 Austin TX 78730 5039 512 794 5678 Glossary lt 2 5 2 ASCII ATN CIC CPU DAV DIO
37. velop with our products and we want to help if you have problems with them To make it easy for you to contact us this manual contains comment and configuration forms for to you complete These forms are located in Appendix E Customer Communication at the end of this manual GPIB 150 User Manual x National Instruments Corporation Chapter 1 Introduction This chapter contains a description of the GPIB 130 lists the contents of your GPIB 130 kit lists optional equipment and explains how to unpack the GPIB 130 The GPIB 130 is a high speed bus extender with the following features e It extends the maximum GPIB cable length to 300 m e It expands the GPIB to interface up to 28 devices e It performs high speed parallel transmissions with rates up to 900 kbytes sec e It has a switch to select buffered transfers for high performance or normal GPIB transfers with interlocked handshaking e thasa switch to select immediate parallel poll mode for cable lengths of 60 m or less or stored parallel poll mode for longer distances Description of the GPIB 130 The high speed GPIB 130 bus extender shown in Figure 1 1 is used in pairs with a special parallel data transmission cable to connect two separate GPIB IEEE 488 bus systems in a functionally transparent manner Figure 1 1 The Model GPIB 130 Bus Extender O National Instruments Corporation 1 1 GPIB 130 User Manual Introduction Chapter 1 While the two bus systems are
38. w the GPIB 130 circuitry operates e Appendix A Operation of the GPIB describes GPIB terminology and protocol for users unfamiliar with the GPIB e Appendix B Specifications lists the specifications of the GPIB 130 e Appendix C Cable Assembly Wire List contains the listing of wire connections for the GPIB 130 transmission cable e Appendix D Multiline Interface Messages contains an ASCII chart with a list of the corresponding GPIB messages and hex values e Appendix E Customer Communication contains forms for you to complete to facilitate communication with National Instruments concerning our products The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics and symbols Conventions Used in This Manual Throughout this manual the following convention is used to distinguish elements of text italic Italic text denotes emphasis a cross reference or an introduction to a key concept National Instruments Corporation ix GPIB 150 User Manual About This Manual Related Documentation The following document contains information that you may find helpful as you read this manual ANSI IEEE Standard 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation Customer Communication National Instruments wants to receive your comments on our products and manuals We are interested in the applications you de
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