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the (127), ieee (89), and (70), 488 (70), for (56), bus (54), interface (49), with (35), standard (31), data (28), pin (28), gpib (25), hewlett (21), packard (21), was (20), #standards (19), retrieved (18), 2010 (17), iec (17), edit (16), commands (16), connectors (16), instruments (15), computer (14), series (14), commodore (14), pdf (14), instrumentation (14), this (13), from (13), parallel (13), programmable (13), other (12), devices (12), digital (12), bit (12), use (11), test (11), such (11), protocol (11), port (10), device (10), address (10), page (9), national (9), computers (9), general (9), part (9), 1987 (9), used (9), not (9), agilent (8), wire (8), pci (8), connector (8), std (8), one (8), measurement (8), input (8), output (8), wikipedia (7), link (7), gnd (7), control (7), compaq (7), technologies (7), are (7), their (7), card (7), isbn (7), electronics (7), instrument (7), scpi (7), complete (7), but (7), service (6), 802 (6), can (6), serial (6), 60488 (6), 2004 (6), 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Text of the page (random words):
it electrically parallel bus which employs sixteen signal lines eight used for bi directional data transfer three for handshake and five for bus management plus eight ground return lines the bus supports 31 five bit primary device addresses numbered from 0 to 30 allocating a unique address to each device on the bus 18 19 the standard allows up to 15 devices to share a single physical bus of up to 20 metres 66 ft total cable length the physical topology can be linear or star forked 20 active extenders allow longer buses with up to 31 devices theoretically possible on a logical bus control and data transfer functions are logically separated a controller can address one device as a talker and one or more devices as listeners without having to participate in the data transfer it is possible for multiple controllers to share the same bus but only one can be the controller in charge at a time 21 in the original protocol transfers use an interlocked three wire ready valid accepted handshake 22 the maximum data rate is about one megabyte per second the later hs 488 extension relaxes the handshake requirements allowing up to 8 mbyte s the slowest participating device determines the speed of the bus 23 connectors edit ieee 488 pinout female ieee 488 connector pin 1 dio1 data input output bit pin 2 dio2 data input output bit pin 3 dio3 data input output bit pin 4 dio4 data input output bit pin 5 eoi end or identify pin 6 dav data valid pin 7 nrfd not ready for data pin 8 ndac not data accepted pin 9 ifc interface clear pin 10 srq service request pin 11 atn attention pin 12 shield pin 13 dio5 data input output bit pin 14 dio6 data input output bit pin 15 dio7 data input output bit pin 16 dio8 data input output bit pin 17 ren remote enable pin 18 gnd wire twisted with dav pin 19 gnd wire twisted with nrfd pin 20 gnd wire twisted with ndac pin 21 gnd wire twisted with ifc pin 22 gnd wire twisted with srq pin 23 gnd wire twisted with atn pin 24 logic ground ieee 488 specifies a 24 pin amphenol designed micro ribbon connector micro ribbon connectors have a d shaped metal shell but are larger than d subminiature connectors they are sometimes called centronics connectors after the 36 pin micro ribbon connector centronics used for their printers one unusual feature of ieee 488 connectors is they commonly use a double headed design with male on one side and female on the other this allows stacking connectors for easy daisy chaining mechanical considerations limit the number of stacked connectors to four or fewer although a workaround involving physically supporting the connectors may be able to get around this they are held in place by screws either 6 32 unc 24 now largely obsolete or metric m3 5 0 6 threads early versions of the standard suggested that metric screws should be blackened to avoid confusion with the incompatible uts threads however by the 1987 revision this was no longer considered necessary because of the prevalence of metric threads 25 the iec 60625 standard prescribes the use of 25 pin d subminiature connectors the same as used for the parallel port on ibm pc compatibles this connector did not gain significant market acceptance against the established 24 pin connector capabilities edit ieee 488 port with listed capabilities on a laboratory temperature controller capabilities 26 function abbreviation description and examples source handshake sh 1 complete acceptor handshake ah 1 complete basic talker t 5 responds to serial poll untalks when listen address received talk only capability 6 untalks when listen address received no talk only 7 no serial poll untalks when listen address received talk only capability extended talker te 0 no extended talker basic listener l 3 listen only mode unlistens if talk address received 4 unlistens if talk address received extended listener le 0 no extended listener service request sr 0 no service request capability 1 complete remote local rl 0 no local lockout 1 complete parallel poll pp 0 does not respond to parallel poll device clear dc 1 complete device trigger dt 0 no device trigger capability 1 complete controller c 0 no controller function e 1 open collector drive electronics 2 three state drivers use as a computer interface edit national instruments gpib controller card for pci bus hp s designers did not specifically plan for ieee 488 to be a peripheral interface for general purpose computers the focus was on instrumentation but when hp s early microcomputers needed an interface for peripherals disk drives tape drives printers plotters etc hp ib was readily available and easily adapted to the purpose hp computer products which used hp ib included the hp series 80 hp 9800 series 27 the hp 2100 series 28 and the hp 3000 series 29 hp computer peripherals which did not utilize the rs 232 communication interface often used hp ib including disc systems like the hp 7935 some of hp s advanced pocket calculators of the 1980s such as the hp 41 and hp 71b series also had ieee 488 capabilities via an optional hp il hp ib interface module other manufacturers adopted gpib for their computers as well such as with the tektronix 405x line the commodore pet introduced 1977 range of personal computers connected their peripherals using the ieee 488 bus but with a non standard card edge connector commodore s following 8 bit machines utilized a serial bus whose protocol was based on ieee 488 30 commodore marketed an ieee 488 cartridge for the vic 20 31 and the commodore 64 32 several third party suppliers of commodore 64 peripherals made a cartridge for the c64 that provided an ieee 488 derived interface on a card edge connector similar to that of the pet series 33 eventually faster more complete standards such as scsi superseded ieee 488 for peripheral access rear of commodore 8032 sk showing ieee 488 port rear of commodore sfd 1001 floppy disk drive with ieee 488 port c64 interface acorn ieee 488 interface usb gpib protocol converter rear of tektronix tds 210 digital oscilloscope with ieee 488 port rear of keysight 34970a data acquisition chassis multimeter with ieee 488 port rear of keithley dmm7510 multimeter with ieee 488 port hp 7580b plotter with ieee 488 port hp thinkjet 2225a with ieee 488 port comparison with other interface standards edit this section does not cite any sources please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed february 2010 learn how and when to remove this message electrically ieee 488 used a hardware interface that could be implemented with some discrete logic or with a microcontroller the hardware interface enabled devices made by different manufacturers to communicate with a single host since each device generated the asynchronous handshaking signals required by the bus protocol slow and fast devices could be mixed on one bus the data transfer is relatively slow so transmission line issues such as impedance matching and line termination are ignored there was no requirement for galvanic isolation between the bus and devices which created the possibility of ground loops causing extra noise and loss of data physically the ieee 488 connectors and cabling were rugged and held in place by screws while physically large and sturdy connectors were an advantage in industrial or laboratory set ups the size and cost of the connectors was a liability in applications such as personal computers although the electrical and physical interfaces were well defined there was not an initial standard command set devices from different manufacturers might use different commands for the same function 34 some aspects of the command protocol standards were not standardized until standard commands for programmable instruments scpi in 1990 implementation options e g end of transmission handling can complicate interoperability in pre ieee 488 2 devices more recent standards such as usb firewire and ethernet take advantage of declining costs of interface electronics to implement more complex standards providing higher bandwidth the multi conductor parallel data connectors and shielded cable were inherently more costly than the connectors and cabling that could be used with serial data transfer standards such as rs 232 rs 485 usb firewire or ethernet very few mass market personal computers or peripherals such as printers or scanners implemented ieee 488 see also edit wikimedia commons has media related to ieee 488 commodore bus serial bus of the home computers series of commodore hp series 80 1980 hewlett packard small scientific desktop computer hp il communications protocol lan extensions for instrumentation ethernet standard pci extensions for instrumentation laboratory instrumentation hardware platform rocky mountain basic dialect of the basic programming language standard commands for programmable instruments communications protocol for test equipment virtual instrument software architecture test and measurement api pages displaying short descriptions of redirect targets references edit the hewlett packard interface bus hp ib nelson gerald e ricci david w october 1972 a practical interface system for electronic instruments pdf hewlett packard journal 24 2 2 7 controllers 3260a marked card reader 9820a calculator with 11144a interface kit loughry donald c october 1972 a common digital interface for programmable instruments the evolution of a system pdf hewlett packard journal 24 2 8 11 agilent technologies reveals name of electronic measurement spin off company agilent 7 january 2014 archived from the original on 8 december 2019 retrieved 19 december 2014 exhibit 99 1 www sec gov ieee standard digital interface for programmable instrumentation institute of electrical and electronics engineers 1978 doi 10 1109 ieeestd 1978 7425098 isbn 978 1 5044 0366 5 ansi ieee std 488 1978 ieee standard digital interface for programmable instrumentation institute of electrical and electronics engineers 1987 isbn 0 471 62222 2 ansi ieee std 488 1 1987 p iii ieee standard codes formats protocols and common commands for use with ieee std 488 1 1987 ieee standard digital interface for programmable instrumentation institute of electrical and electronics engineers 1992 isbn 978 1 55937 238 1 ieee std 488 2 1992 project mate in 1985 gpib 101 a tutorial of the gpib bus ics electronics p 5 paragraph scpi commands hewlett packard test measurement catalog 1991 pdf hparchive com p 8 paragraph scpi history of gpib national instruments retrieved 2010 02 06 in 1990 the ieee 488 2 specification included the standard commands for programmable instrumentation scpi document upgraded standard boosts speed of ieee 488 instrument buses eightfold ieee 2003 10 06 archived from the original on december 7 2003 retrieved 2010 02 06 hp and other test and measurement companies urge ieee to oppose revisions of established ieee 488 standard press release hewlett packard company december 1997 archived from the original on 2011 06 10 retrieved 2010 02 16 p488 1 project home ieee archived from the original on 2010 04 28 retrieved 2010 02 16 iec ieee standard for higher performance protocol for the standard digital interface for programmable instrumentation part 1 general adoption of ieee std 488 1 2003 ieee doi 10 1109 ieeestd 2004 95749 isbn 978 0 7381 4536 5 standard digital interface for programmable instrumentation part 2 codes formats protocols and common commands adoption of ieee std 488 2 1992 ieee doi 10 1109 ieeestd 2004 95390 hdl 11059 14380 isbn 978 0 7381 4100 8 replaced or withdrawn publications iec retrieved 2010 02 06 cite web cs1 maint deprecated archival service link posch maya 2025 12 16 after decades linux finally gains stable gpib support hackaday retrieved 2026 03 15 gpib addressing pdf ni 488 2 user manual national instruments corporation february 2005 p a 2 ni p n 370428c 01 retrieved 2010 02 16 the primary address is a number in the range 0 to 30 table 1 1 82350 gpib interface card configuration parameters pdf agilent 82350b pci gpib interface installation and configuration guide agilent technologies 2009 07 20 p 26 agilent p n 82350 90004 retrieved 2010 02 16 any address in the range 0 30 inclusive may be used gpib instrument control tutorial national instruments 2009 08 24 retrieved 2010 02 16 connected in either a daisy chain or star topology ni 488 2 user manual pdf national instruments corporation february 2005 p a 1 ni p n 370428c 01 archived from the original pdf on 2008 12 02 retrieved 2010 02 16 handshake lines pdf ni 488 2 user manual national instruments corporation february 2005 p a 3 ni p n 370428c 01 retrieved 2010 02 16 using hs488 to improve gpib system performance national instruments corporation 30 march 2009 retrieved 2010 02 16 mechanical aspects pdf tutorial description of the hewlett packard interface bus hewlett packard p 28 retrieved 2022 06 13 some existing cables use english threads 6 32unk ieee standard digital interface for programmable instrumentation institute of electrical and electronics engineers 1987 p v isbn 978 0 471 62222 2 ansi ieee std 488 1 1987 the helpful note on metric threads found in previous editions has been deleted since metric thread use is common ieee 488 practice consequently the recommendation to coat such parts in black material to call attention to metric threads is also considered unnecessary tilden mark d 1983 appendix a subsets describe interface functions pdf 4041 gpib programming guide tektronix inc pp 113 115 citation cite uses generic title help hp 98135a hp ib interface 9815 hp computer museum retrieved 2010 02 06 59310a hp ib interface hp computer museum retrieved 2010 02 06 hp ib interface for hp1000 and hp2000 computers 27113a hp ib interface hp computer museum retrieved 2010 02 06 cio hp ib interface for 3000 series 900 bagnall brian 2006 on the edge the spectacular rise and fall of commodore variant press p 221 isbn 0 9738649 0 7 oclc 761384138 commodore drawing for vic 1112 drawing no 1110010 rev a reverse engineered schematics for commodore c64 ieee interface http www zimmers net anonftp pub cbm schematics cartridges c64 ieee 488 index html link to schematic for one such converter early devices might respond to an id command with an identification string later standards had devices respond to the id command external links edit part 1 specifications edit ieee iec 60488 1 2004 158 page pdf file costs usd423 in 2026 part 2 specifications edit ieee 488 2 1992 254 page pdf file costs usd56 in 2026 superseded by ieee iec 60488 2 2004 ieee iec 60488 2 2004 264 page pdf file costs usd404 in 2026 other edit gpib ieee 488 multiple page tutorial v t e technical and de facto standards for wired computer buses general system bus front side bus back side bus daisy chain control bus address bus bus contention bus mastering network on a chip plug and play double data rate quad data rate list of bus bandwidths standards ss 50 bus s 100 bus multibus unibus vaxbi mbus std bus smbus q bus europe car...