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Appendix A

GPIB Basics

©

National Instruments Corporation

A-5

GPIB-120B User Manual

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, as shown in Figure A-1. With this design, you can link devices
in a linear configuration, a star configuration, or a combination of the
two configurations. Figure A-2 shows the linear and star configurations.

Figure A-1.

GPIB Connector and the Signal Assignment

13
14
15
16
17
18
19
20
21
22
23
24

1
2
3
4
5
6
7
8
9

10
11
12

DIO5
DIO6
DIO7
DIO8
REN
GND (TW PAIR W/DAV)
GND (TW PAIR W/NRFD)
GND (TW PAIR W/NDAC)
GND (TW PAIR W/IFC)
GND (TW PAIR W/SRQ)
GND (TW PAIR W/ATN)
SIGNAL GROUND

DIO1
DIO2
DIO3
DIO4

EOI

DAV

NRFD

NDAC

IFC

SRQ

ATN

SHIELD

«
...
23
24
25
26
27
...
»

Summary of Contents for GPIB-120B

Page 1: ...ents GPIB 120B Manual Get Pricing Availability at ApexWaves com Call Today 1 800 915 6216 Email sales apexwaves com https www apexwaves com modular systems national instruments gpib instrument control modules GPIB 120B ...

Page 2: ...GPIB GPIB 120B User Manual GPIB 120B User Manual April 2010 371851B 01 ...

Page 3: ...ebanon 961 0 1 33 28 28 Malaysia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 328 90 10 Portugal 351 210 311 210 Russia 7 495 783 6851 Singapore 1800 226 5886 Slovenia 386 3 425 42 00 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 2005151 Taiwan 886 02 2377 2222 Thailand ...

Page 4: ...ion retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation National Instruments respects the intellectual property of others and we ask our users to do the same NI software is protected by copyright and other intellectual property laws Where NI software may be used to reproduce software or other materials belonging to others you ma...

Page 5: ...re encouraged to try to correct the interference by one or more of the following measures Reorient the antenna of the receiver the device suffering interference Relocate the transmitter the device generating interference with respect to the receiver Plug the transmitter into a different outlet so that the transmitter and the receiver are on different branch circuits Some hardware may require the u...

Page 6: ...ew GPIB 120B LEDs 2 1 Power On PWR 2 1 System Controller Detection SC 2 2 Active Controller Detection AC 2 2 Source Handshake Detection SH 2 2 Data Transfer Modes 2 2 Selecting a Data Transfer Mode 2 3 Unbuffered Mode 2 3 Buffered Mode 2 3 Setting the Data Transfer Mode 2 4 Data Direction Control 2 4 Parallel Poll Detection 2 4 Parallel Poll Operation 2 5 Chapter 3 Configuring and Using Your Hardw...

Page 7: ...Contents GPIB 120B User Manual vi ni com Appendix C Specifications Appendix D Technical Support and Professional Services Glossary Index ...

Page 8: ...xt also denotes parameter names GPIB 120B GPIB 120B refers to a National Instruments GPIB isolator expander that expands and isolates the GPIB up to a maximum of 2500 VDC IEEE 488 and IEEE 488 and IEEE 488 2 refer to the ANSI IEEE Standard 488 1 1987 IEEE 488 2 and the ANSI IEEE Standard 488 2 1992 respectively which define the GPIB italic Italic text denotes variables emphasis a cross reference o...

Page 9: ...The following documents contain information that you may find helpful as you read this manual ANSI IEEE Standard 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation ANSI IEEE Standard 488 2 1992 IEEE Standard Codes Formats Protocols and Common Commands ...

Page 10: ...ng the 20 m cable limit It has optional rack or din rail mount hardware accessories The high speed GPIB 120B bus isolator expander connects two GPIB IEEE 488 bus systems in a functionally transparent manner The two bus systems are electrically isolated from each other The two bus systems are also isolated from the power supply Isolation is maintained up to 2500 VDC withstand 5 s Isolating an instr...

Page 11: ...pical GPIB 120B Expansion System Logical Configuration Computer Controller Talker and Listener Printer Listener GPIB 120B GPIB GPIB Multimeter Talker and Listener Signal Generator Listener Unit Under Test Computer Controller Talker and Listener Printer Listener GPIB Multimeter Talker and Listener Signal Generator Listener Unit Under Test ...

Page 12: ...devices to 28 devices The cable length limit for the system is also increased an additional 4 m to 20 m depending on the number of devices on that side of the expansion All signal expansion is bidirectional meaning that Controllers Talkers and Listeners can be on either side of the expander The GPIB 120B light emitting diodes LEDs indicate the location of the System Controller Active Controller an...

Page 13: ...quipment You can contact National Instruments to order any of the following optional equipment Rack mount kit part number 194906 01 shown in Figure 1 3 Figure 1 3 Rack Mount Kit DIN rail mount kit part number 779689 01 shown in Figure 1 4 Figure 1 4 DIN Rail Mount Kit ...

Page 14: ...nstruments for instructions Retain the shipping material for possible inspection by carrier or reshipment of the equipment 3 Verify that the voltage you will be using is in the input range of your power adapter The GPIB 120B ships with a power adapter capable of working with an input AC voltage between 100 V and 240 V This adapter provides 12 VDC to the GPIB 120B This adapter can be replaced as lo...

Page 15: ...tive Controller or Source Handshake state as shown in Figure 2 1 LEDs associated with Bus A are green while those associated with Bus B are amber Figure 2 1 Front View GPIB 120B Power On PWR When you power on the GPIB 120B all circuitry is cleared to an initialized state The isolation expansion system is fully operational when you power on the GPIB 120B and your instruments are connected Where the...

Page 16: ...ctive Controller state becomes true and the Bus A Active Controller state becomes false Source Handshake Detection SH A device is considered a source handshaker if it is an active Controller sourcing command bytes or if it is a Talker sourcing data bytes After you power on Bus A and Bus B Source Handshake states are false If a GPIB device on Bus A asserts DAV the Bus A Source Handshake state becom...

Page 17: ...a GPIB device on the local side of the isolator expander is addressed to talk another device on the remote side is addressed to listen When the Talker sources data bytes the GPIB isolator expander accepts the data bytes and stores them in a FIFO buffer At the same time the GPIB isolator expander reads data from the FIFO buffer and sources data bytes to the Listener If the FIFO buffer contains data...

Page 18: ...true 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 Parallel Poll Detection Controllers can conduct parallel polls on Bus A or Bus B and devices on both Bus A and Bus B can respond to parallel polls If a Controller on Bus A conducts a parallel poll th...

Page 19: ...When the poll on the primary side finishes a message is sent to finish it on the secondary side where the poll finishes about 400 ns later Therefore if the secondary side of the GPIB 120B waited until the end of its parallel poll to send the result of the poll to the primary side it would be after the primary side poll has ended Thus the controller would miss the responses of the devices on the se...

Page 20: ...power cord of your 12 VDC power supply into an acceptable electrical outlet 100 240 VAC Plug the other end of the power cord into the power supply Connect the 12 VDC output of the power supply into the rear panel of the GPIB 120B 3 Link your GPIB instrument s board s and other device s to the GPIB 120B with appropriate cables 4 Verify that the switch is in the data transfer mode required for your ...

Page 21: ...ional instruments The ANSI IEEE Standard 488 2 1992 extends IEEE 488 1 by defining a bus communication protocol a common set of data codes and formats and a generic set of common device commands Types of Messages Interconnected GPIB devices communicate by passing messages through the interface system including device dependent messages and interface messages Device dependent messages also called d...

Page 22: ... Controller is similar 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 a data message it connects the caller Talker to the receiver Listener The Controller addresses a Talker and a L...

Page 23: ...return shield drain lines The 16 signal lines are discussed in the following sections Data Lines Eight data lines DIO1 through DIO8 carry both data and command messages Handshake Lines Three hardware handshake lines asynchronously control the transfer of message bytes between devices This process is a three wire interlocked handshake and it guarantees that devices send and receive message bytes on...

Page 24: ...n it sends commands and false when it sends data messages IFC interface clear System Controller drives the IFC line to initialize the bus and make itself CIC REN remote enable System Controller drives the REN line to place devices in remote or local program mode SRQ service request Any device can drive the SRQ line to asynchronously request service from the Controller EOI end or identify Talker us...

Page 25: ...ith this design you can link devices in a linear configuration a star configuration or a combination of the two configurations Figure A 2 shows the linear and star configurations Figure A 1 GPIB Connector and the Signal Assignment 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 DIO5 DIO6 DIO7 DIO8 REN GND TW PAIR W DAV GND TW PAIR W NRFD GND TW PAIR W NDAC GND TW PAIR W IFC GND TW P...

Page 26: ...ow level 0 8 V and when DAV is false it is a TTL high level 2 0 V Configuration Requirements To achieve the high data transfer rate that the GPIB was designed for you must limit the number of devices on the bus and the physical distance between devices The following restrictions are typical A maximum separation of 4 m between any two devices and an average separation of 2 m over the entire bus A m...

Page 27: ...system must be powered on Cable lengths must be as short as possible with up to a maximum of 15 m of cable for each system There must be at least one equivalent device load per meter of cable If you want to exceed these limitations you can use a bus expander to increase the number of device loads You can order GPIB 120B bus expanders from National Instruments ...

Page 28: ... The multiline interface messages are commands defined by the IEEE 488 standard The messages are sent and received with ATN asserted The interface functions include initializing the bus addressing and unaddressing devices and setting device modes for local or remote programming For more information about these messages refer to the ANSI IEEE Standard 488 1 1987 IEEE Standard Digital Interface for ...

Page 29: ... 40 MLA8 09 9 HT TCT 29 41 MLA9 0A 10 LF 2A 42 MLA10 0B 11 VT 2B 43 MLA11 0C 12 FF 2C 44 MLA12 0D 13 CR 2D 45 MLA13 0E 14 SO 2E 46 MLA14 0F 15 SI 2F 47 MLA15 10 16 DLE 30 48 0 MLA16 11 17 DC1 LLO 31 49 1 MLA17 12 18 DC2 32 50 2 MLA18 13 19 DC3 33 51 3 MLA19 14 20 DC4 DCL 34 52 4 MLA20 15 21 NAK PPU 35 53 5 MLA21 16 22 SYN 36 54 6 MLA22 17 23 ETB 37 55 7 MLA23 18 24 CAN SPE 38 56 8 MLA24 19 25 EM S...

Page 30: ...2 6C 108 l MSA12 PPE CFG12 4D 77 M MTA13 6D 109 m MSA13 PPE CFG13 4E 78 N MTA14 6E 110 n MSA14 PPE CFG14 4F 79 O MTA15 6F 111 o MSA15 PPE CFG15 50 80 P MTA16 70 112 p MSA16 PPD 51 81 Q MTA17 71 113 q MSA17 PPD 52 82 R MTA18 72 114 r MSA18 PPD 53 83 S MTA19 73 115 s MSA19 PPD 54 84 T MTA20 74 116 t MSA20 PPD 55 85 U MTA21 75 117 u MSA21 PPD 56 86 V MTA22 76 118 v MSA22 PPD 57 87 W MTA23 77 119 w MS...

Page 31: ... Execute Trigger GTL Go To Local LLO Local Lockout MLA My Listen Address MSA My Secondary Address MTA My Talk Address PPC Parallel Poll Configure PPD Parallel Poll Disable PPE Parallel Poll Enable PPU Parallel Poll Unconfigure SDC Selected Device Clear SPD Serial Poll Disable SPE Serial Poll Enable TCT Take Control UNL Unlisten UNT Untalk ...

Page 32: ...mbination of star or linear pattern Performance Characteristics Maximum transfer rate Buffered mode 1 25 Mbytes s Unbuffered mode 450 kbytes s Interlocked IEEE 488 handshake Maintained across the expansion in unbuffered mode IEEE 488 capability identification codes SH1 Complete Source Handshake AH1 Complete Acceptor Handshake T5 TE5 Complete Talker L3 LE3 Complete Listener SR1 Complete Service Req...

Page 33: ...rts and between each port and the power supply 2500 VDC dielectric withstand 5 s max Input voltage range 10 18 VDC Current consumption 12 V 300 mA typical 500 mA maximum Fuse rating and type F 2 2 A 125 V surface mount 12 VDC Power Supply shipped with GPIB 120B Input voltage range 100 240 VAC 47 63 Hz Environment Maximum altitude 2 000 m at 25 C ambient temperature Pollution Degree 2 Indoor use on...

Page 34: ...cordance with IEC 60068 2 56 Storage Environment Ambient temperature range 20 to 70 C Tested in accordance with IEC 60068 2 1 and IEC 60068 2 2 Relative humidity range 5 to 95 noncondensing Tested in accordance with IEC 60068 2 56 Shock and Vibration Operational shock 30 g peak half sine 11 ms pulse Tested in accordance with IEC 60068 2 27 Test profile developed in accordance with MIL PRF 28800F R...

Page 35: ...B 120B User Manual C 4 ni com Physical Characteristics Overall dimensions 6 30 3 68 1 24 in 16 01 9 35 3 15 cm Case material PC ABS plastic Weight 8 64 oz 245 g GPIB cable Type X2 shielded Figure C 1 shows the GPIB 120B dimensions ...

Page 36: ...has threaded inserts for mounting options 6 000 in 152 4 mm 1 120 in 28 45 mm 0 120 in 3 05 mm 1 875 in 47 63 mm 2 250 in 57 15 mm 0 800 in 20 32 mm 3 682 in 93 53 mm 1 441 in 36 61 mm 4 x 4 40 Threaded Insert Max Insertion 0 190 in 4 82 mm 0 152 in 3 86 mm 0 152 in 3 86 mm 0 637 in 16 17 mm 1 795 in 45 59 mm GPIB 120B Isolator Expander ...

Page 37: ...ions AS NZS CISPR 11 Group 1 Class A emissions FCC 47 CFR Part 15B Class A emissions ICES 001 Class A emissions Note For the standards applied to assess the EMC of this product refer to the Online Product Certification section Note For EMC compliance operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European Directives as follows 20...

Page 38: ...ronmental regulations and directives with which NI complies as well as other environmental information not included in this document Waste Electrical and Electronic Equipment WEEE EU Customers At the end of the product life cycle all products must be sent to a WEEE recycling center For more information about WEEE recycling centers National Instruments WEEE initiatives and compliance with WEEE Dire...

Page 39: ...Service Program Membership This program entitles members to direct access to NI Applications Engineers via phone and email for one to one technical support as well as exclusive access to on demand training modules via the Services Resource Center NI offers complementary membership for a full year after purchase after which you may renew to continue your benefits For information about other technic...

Page 40: ...ct by visiting ni com certification Calibration Certificate If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration If you searched ni com and could not find the answers you need contact your local office or NI corporate headquarters Phone numbers for our worldwide offices are listed at the front of this manual You also can visit the W...

Page 41: ...A amperes AC alternating current AHE HS488 Acceptor Handshake Extended interface function ANSI American National Standards Institute ASCII American Standards Code for Information Interchange ASIC application specific integrated circuit ATN Attention C Celsius CIC Controller In Charge CPU central processing unit CSA Canadian Standards Association DAV data valid dB decibels DC direct current ...

Page 42: ...PIB General Purpose Interface Bus hex hexadecimal Hz hertz IDY Identify IEC International Electrotechnical Commission IEEE Institute of Electrical and Electronic Engineers IFC Interface Clear in inches lb pounds LED light emitting diode m meters s seconds SHE HS488 Source Handshake Extended interface function TTL transistor transistor logic UL Underwriter s Laboratories V volts VAC volts alternati...

Page 43: ...on of Conformity NI resources D 2 description of GPIB 120B 1 1 diagnostic tools NI resources D 1 DIN rail mount kit figure 1 4 documentation conventions used in manual vii NI resources D 1 related documentation viii drivers NI resources D 1 E electrical characteristics C 2 electromagnetic compatibility C 6 environmental management specifications C 7 equipment optional 1 4 examples NI resources D 1...

Page 44: ...ontrol 2 4 meanings of colors 2 1 parallel poll detection 2 4 power on 2 1 source handshake detection 2 2 system controller detection 2 2 linear and star system configuration figure A 6 listeners A 2 M multiline interface messages B 1 table B 2 N National Instruments support and services D 1 O operational characteristics C 2 optional equipment 1 4 overview hardware 2 1 P parallel poll detection 2 ...

Page 45: ...ical characteristics C 4 safety C 6 system configuration C 1 Waste Electrical and Electronic Equipment WEEE C 7 support technical D 1 switch setting buffered figure 2 4 system configuration C 1 system controller detection 2 2 T talkers A 2 technical support D 1 training and certification NI resources D 1 troubleshooting NI resources D 1 types of messages A 1 U unpacking 1 5 W Waste Electrical and ...

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