5-1 www.adlinktech.com high-performance ieee-488 gpib interface for usb/pci features fully compatible with the ieee-488 standard supports a 32-bit 3.3 v or 5 v pci bus up to 1.5 mb/s data transfer rates built-in fifo for read/write operations provides apis compatible with ni-488.2 driver software* supports industrial-standard visa library interactive utility for testing and diagnostics easy gpib connectively for laptop computer (USB-3488A) plug and play interface; no gpib cable required for instrument connection (USB-3488A) 2 m usb cable attached (USB-3488A) usb 2.0 compatible (USB-3488A) no external power required (USB-3488A) operating systems ? supports windows 7/vista/2000/xp/server 2003 recommended software ? vb/vc++/bcb ? labview* ? labwindow/cvi* usb/lpci-3488a introduction the ieee-488 standard, also known as gpib, is a bus interface that connects instruments with a computer to form an ate system. gpib was initially developed by hewlett packard and was recognized as an ieee standard in 1978. the ieee-488.1-1978 standard defines the convention for electrical and mechanical bus characteristics, as well as the state diagram for each bus function. in 1987, another standard was derived from the original ieee-488.1-1978 and known as ieee-488.2-1978. it was introduced to define data formats, common commands, and control protocols for instruments. in general, ieee-488.1 defines hardware specifications, and ieee-488.2 defines software specifications. the ieee-488 standard has been widely accepted by instrument vendors over the past few decades. today, gpib is still the most popular interface between computer and instruments. 5system management lines 3 handshake lines 8 data lines instrument a able to talk, listen and control ex: computer instrument b able to talk and to listen ex: oscilloscoae instrument c able to listen ex: function generator eoi ifc srq atn ren dav nrfd di01-8 handshake and data signals on the gpib bus ndac linear instrument connection star instrument connection instrument a instrument b instrument c instrument a instrument c instrument d instrument b adlink gpib data xfer rate (small block data) 200 400 600 800 1000 data xfer rate (kb/s) block size (bytes) 200 600 800 1000 400 0 adlink gpib data xfer rate (large block data) data xfer rate (kb/s) block size (kbytes) 0 400 600 200 1000 800 1200 1400 1600 15 45 60 75 90 105 120 135 150 30 adlink's USB-3488A and lpci-3488a controller interface cards are fully compatible with the ieee-488.2 instrumentation control and communication standard and are capable of controlling up to 14 stand-alone instruments via ieee-488 cables. the USB-3488A and lpci-3488a are designed to meet the requirements for high performance and maximum programming portability. the USB-3488A and lpci-3488a is developed using adlink's intellectual property in fpgas which incorporates a gpib controller, provides capability, and supports a transfer rate up to 1.5 mb/s. with apis that are compatible with ni-488.2* driver software and visa support, the USB-3488A and lpci-3488a offer the best compatibility with your existing applications and instrument drivers performance adlink's expertise in pci and pxi interface cards was leveraged when developing these newly designed gpib interface cards. the lpci-3488a, which is the low-profile pci form factor, supports both 3.3 v and 5 v pci buses and can be adapted to most industrial and desktop computers. a built-in fifo is placed between the gpib bus and pci controller to buffer gpib read/write operations. this fifo eliminates the gap between the slow gpib bus (~1.5 mb/s) and the fast pci bus (132 mb/s), the maximum gpib transfer rates of lpci-3488a is 1.5 mb/s, and dramatically increases overall system performance. 5system management lines 3 handshake lines 8 data lines instrument a able to talk, listen and control ex: computer instrument b able to talk and to listen ex: oscilloscoae instrument c able to listen ex: function generator eoi ifc srq atn ren dav nrfd di01-8 handshake and data signals on the gpib bus ndac linear instrument connection star instrument connection instrument a instrument b instrument c instrument a instrument c instrument d instrument b adlink gpib data xfer rate (small block data) 200 400 600 800 1000 data xfer rate (kb/s) block size (bytes) 200 600 800 1000 400 0 adlink gpib data xfer rate (large block data) data xfer rate (kb/s) block size (kbytes) 0 400 600 200 1000 800 1200 1400 1600 15 45 60 75 90 105 120 135 150 30 lpci-3488a USB-3488A
5-2 www.adlinktech.com gpib communications microsoft vc++/vb ni labview* ni labwindows/cvi* agilent veepro direct invocation to gpib driver api functions ade visa driver api (gpib-32.dll) gpib cards native driver api to provide ieee- 488 functions using existing instrument drivers via visa in ade adlink USB-3488A adlink lpci-3488a agilent 82350b ni pci-gpib* ... fully compatible with your existing applications adlink gpib interface cards are delivered with complete software support, including a driver api that is fully binary compatible with ni-488.2* driver software. all programs written based on gpib-32.dll can be executed with USB-3488A and lpci-3488a without any modification. visa library is also supported to ensure compatibility with applications utilizing visa. the adlink USB-3488A and lpci-3488a thus provides the plug and play compatibility with all your existing applications. how do adlink's gpib interface cards work? the objective of a test and measurement application is to test a specific uut (unit under test) automatically. a typical automatic testing system includes testing programs and various testing equipment connected to the host computer via a gpib interface. to manage the connections with gpib instruments, testing programs are usually developed according to the following model: ades (application development environments), the environment where applications are written. some ades are popular because users can implement any function needed using textual programming (ex. vc++/vb, testexec) or graphical programming (ex. labview?*) techniques. a vital part of a test and measurement application is to control and communicate with gpib instruments. two techniques are generally used to control the gpib interface: invoke the native driver api or use the existing instrument drivers via visa. a native driver api is provided by most gpib interface vendors and is usually in the form of ansi c functions. for users who need more detailed control over gpib instruments, using a driver api with scpi string commands is a good choice. for others who want to keep away from complicated instrument commands, instrument drivers developed for specific ades (ex. labview?*/testexec) can significantly simplify the complexity of instrument control. most of the instrument drivers use a visa library to control the gpib interface and communicate with instruments. visa support is essential in this case. adlink gpib interface cards work with your applications in both ways. its gpib-32.dll provides binary compatibility with the popular ni-488.2* driver software. the USB-3488A and lpci-3488a also provide visa library support that can be used with most common instrument drivers written by instrument vendors. regardless if you are using vc++, vb, delphi, labview?*, or any other t&m ade, adlink gpib interface cards are the most cost-effective gpib solutions compatible with all your applications. ordering information high-performance ieee-488 gpib interface for usb high-performance ieee-488 gpib interface card for low-profile pci bus, shipped with an additional low-profile bracket. 1 ieee-488 standard cable, 1 meter length ieee-488 standard cable, 2 meter length ieee-488 standard cable, 4 meter length ieee-488 standard cable, 8 meter length product names mentioned herein are used for identification purposes only and may be trademarks and/ or registered trademarks of their respective companies. *ni, labview, and labwindows cvi are trademarks or registered trademarks of national instruments corporation or its subsidiaries in the united states and other countries. gpib bus specifications ? up to 14 instruments connected ? maximum 1.5 mb/s data transfer rate ? cable length -2 meters between each instrument (suggested) -20 meters total cable length ? data transfer mode: 8 bits parallel ? handshake: 3 wire handshake, reception of each data byte is acknowledged certifications ? emc/emi: ce, fcc class a programming interface ? vb/vc++/bcb ? labview?* ? labview?/cvi* external indicators (USB-3488A) ? ready: green for active device ? active blinking amber for transferring data general specifications ? i/o connector : ieee-488 standard 24-pin ? operating temperature : 0c to 55c ? storage temperature : -20c to 80c ? relative humidity : 5% to 95%, non-condensing ? power requirements ? lpci-3488a ? USB-3488A dimensions (not including connectors) : ? lpci-3488a: 120 mm x 64 mm ? USB-3488A: 81.7 mm (l) x 66.1 mm (w) x 27.8 mm (h) i/o connectors ? gpib: ieee-488 standard 24 pin ? usb: usb standard series a plug (USB-3488A) driver compatibility ? all operations can be executed with the adl-gpib driver package specifications +5 v 250 ma (typical) 300 ma (maximum) +5 v 190 ma (typical) 500 ma (maximum) updated 03-28, 2012. ? 2012 adlink technology, inc. all rights reserved. all specifcations are subject to change without further notice.
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