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GPIB-120A

User Manual

October 1994 Edition

Part Number 370893A-01

Содержание GPIB-120A

Страница 2: ...ria 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 0...

Страница 3: ...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...

Страница 4: ...ference 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 c...

Страница 5: ...d correctly you can safely operate the GPIB 120A Because the EMI shield and jack screws of rear panel connector GPIB A are electrically shorted to the rear panel a GPIB cable attached to GPIB Port A h...

Страница 6: ...0A 2 2 Connecting to Hewlett Packard Controllers 2 2 Mounting the GPIB 120A 2 2 Chapter 3 Theory of Operation 3 1 Circuitry of the GPIB 120A 3 1 The GPIB 120A Front Panel 3 2 Power On 3 2 System Contr...

Страница 7: ...1 Appendix D Customer Communication D 1 Figures Figure 1 1 Typical GPIB 120A Extension System Physical Configuration 1 1 Figure 1 2 Typical GPIB 120A Extension System Logical Configuration 1 2 Figure...

Страница 8: ...Specifications lists the specifications of the GPIB 120A Appendix C Multiline Interface Messages contains an interface message reference list which describes the mnemonics and messages that correspon...

Страница 9: ...e for Programmable Instrumentation Customer Communication National Instruments wants to receive your comments on our products and manuals We are very interested in the applications you develop with ou...

Страница 10: ...are The high speed GPIB 120A bus expander connects two GPIB IEEE 488 bus systems in a functionally transparent manner The two bus systems are electrically isolated from each other Isolating an instrum...

Страница 11: ...o 14 additional devices to the bus The GPIB 120A appears as a device load on each side of the expansion therefore one GPIB 120A increases the maximum load limit from 15 devices to 28 devices The cable...

Страница 12: ...sion reception in commercial areas Unpacking Your GPIB 120A Follow these steps when unpacking your GPIB 120A 1 Verify that the package you received contained everything you need to get started as list...

Страница 13: ...trically shorted to the rear panel a GPIB cable attached to GPIB Port A has its shield and connector housing connected to earth ground as well and no danger should exist associated with GPIB Port A Th...

Страница 14: ...Bus B for devices that need to be electrically isolated from devices on Bus A 4 Move the power switch to the on position Connecting to Hewlett Packard Controllers To achieve very high data transfer ra...

Страница 15: ...d from each other The only difference between the two sides is that logic ground on Bus A is connected to the chassis ground while the logic ground for Bus B is not Thus Bus B is the isolated side of...

Страница 16: ...the GPIB 120A and your instruments are connected Where there is GPIB activity it is recommended that you keep at least two thirds of the devices on both buses powered on System Controller Detection Af...

Страница 17: ...rue or if a Controller on Bus A is conducting a parallel poll Bus A sends the data lines to Bus B if the Bus A Source Handshake state is true or if a Controller on Bus B is conducting a parallel poll...

Страница 18: ...the ANSI IEEE Standard 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation Table 3 1 IEEE 488 Capability Identification Codes Capability Code Description SH1 Source Handshake A...

Страница 19: ...rfaces and in comprehensive full function software that helps users bridge the gap between their knowledge of instruments and computer peripherals and of the GPIB itself GPIB Operation The GPIB is a l...

Страница 20: ...party device wants to make a call send 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...

Страница 21: ...fer 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 NRFD...

Страница 22: ...C Interface Clear The System Controller drives the IFC line to initialize the bus and become CIC REN Remote Enable The System Controller drives the REN line which is used to place devices in remote or...

Страница 23: ...or 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 interconnecting applications The GPIB uses negative...

Страница 24: ...Operation of the GPIB Appendix A GPIB 120A User Manual A 6 National Instruments Corporation Figure A 2 Linear Configuration of the GPIB Devices...

Страница 25: ...Appendix A Operation of the GPIB National Instruments Corporation A 7 GPIB 120A User Manual Figure A 3 Star Configuration of the GPIB Devices...

Страница 26: ...extenders and expanders repeaters Extenders connect two separate buses via a transmission medium and the distance between the buses can be quite long Expanders generally buffer one bus from an adjacen...

Страница 27: ...2 Performance Characteristics Characteristic Specification Data transfer rate degradation 250 ns per byte typical Propagation delay All signals except DAV DAV first byte DAV subsequent bytes 140 ns t...

Страница 28: ...0 mA 200 mA 250 V slow blow 50 to 60 Hz GPIB interface load One standard load AC and DC Power 27 VA typical Table B 4 Environmental Characteristics Characteristic Specification Operating temperature 0...

Страница 29: ...face 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 inform...

Страница 30: ...0E 016 14 SO 2E 056 46 MLA14 0F 017 15 SI 2F 057 47 MLA15 10 020 16 DLE 30 060 48 0 MLA16 11 021 17 DC1 LLO 31 061 49 1 MLA17 12 022 18 DC2 32 062 50 2 MLA18 13 023 19 DC3 33 063 51 3 MLA19 14 024 20...

Страница 31: ...55 109 m MSA13 PPE 4E 116 78 N MTA14 6E 156 110 n MSA14 PPE 4F 117 79 O MTA15 6F 157 111 o MSA15 PPE 50 120 80 P MTA16 70 160 112 p MSA16 PPD 51 121 81 Q MTA17 71 161 113 q MSA17 PPD 52 122 82 R MTA18...

Страница 32: ...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...

Страница 33: ...iciently 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 N...

Страница 34: ...ing National Instruments for technical support helps our applications engineers answer your questions efficiently National Instruments Products GPIB Software Revision Number on Disk Programming Langua...

Страница 35: ...Part Number 370893A 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 y...

Страница 36: ...C Controller In Charge CPU central processing unit DAV Data Valid DC direct current DIO Data Input Output EMI electromagnetic interference EOI End Or Identify FCC Federal Communications Commission GPI...

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