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'[EE]: IEEE-488 (GPIB) Interface Questions.'
2000\09\06@121236 by rchock, Steve

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Friends,

I have always wanted to create my own IEEE-488 interface so I could
control some external test fixtures using a HPIB card. Has anybody ever
interfaced with the GPIB bus? I bought 6 "IOT7210" GPIB controllers
from I/O Tech (http://www.iotech.com), poor documentation with no app notes.
I searched TI, National, NEC and a few others but came up with nothing on
examples. An Agilent rep gave me a link to some documentation they have:
ftp.agilent.com/pub/mpusup/pc/iop/hpibtut/index.html
I also found that a company called "iNES" make some GPIB controllers
(http://www.gpib2000.com) but nobody has any real app notes. If anybody has any
experience
with GPIB I would appreciate it if I could ask you a few questions.
Sorry for the OT, but have been researching this for a few weeks and still
have nothing concrete. Thanks again!!!

Best regards,
Steve


Steven Kosmerchock
Radio Frequency Systems
Phoenix,  Arizona  USA
(WORK) http://www.rfsamericas.com

http://www.geocities.com/researchtriangle/lab/6584

"Great spirits have always encountered violent
oppposition from mediocre minds."--A.Einstein

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2000\09\06@121830 by Alan B. Pearce

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I think you will find that practically everyone that uses GPIB uses LabView to
control instruments. It is such a versatile program that if an instrument does
not come with a LabView driver it is almost dead in the water before it starts.

This is an area that I am going to need to get stuck into, using a PIC to
interface device specific interface hardware to GPIB for this specific reason. I
would like to know if anyone has gone this route.

I guess the starting point is the TI 9?488 interface chip (I cannot remember the
complete number at the moment.)

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2000\09\06@124408 by rchock, Steve

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Alan,

In my company we mainly use HP-VEE. At this point I am
more concerned about the HW part of it. TI no longer manufactures
GPIB controllers (obsolete). The old TI part is TMS9914.
The iNES GPIB controller (http://www.gpib2000.com) has all the external
drivers/receivers inside of them. I also planned on using a PIC to
be the "brains" of all of this, control stuff depending on
the commands it is sent, then send the results!!!

Steve


Steven Kosmerchock
Radio Frequency Systems
Phoenix,  Arizona  USA
(WORK) http://www.rfsamericas.com

http://www.geocities.com/researchtriangle/lab/6584

"Great spirits have always encountered violent
oppposition from mediocre minds."--A.Einstein

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2000\09\06@135706 by mike

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On Wed, 6 Sep 2000 12:04:53 -0400, you wrote:

>Friends,
>
>I have always wanted to create my own IEEE-488 interface so I could
>control some external test fixtures using a HPIB card. Has anybody ever
>interfaced with the GPIB bus? I bought 6 "IOT7210" GPIB controllers
>from I/O Tech (http://www.iotech.com), poor documentation with no app notes.
>I searched TI, National, NEC and a few others but came up with nothing on
>examples. An Agilent rep gave me a link to some documentation they have:
>ftp.agilent.com/pub/mpusup/pc/iop/hpibtut/index.html
>I also found that a company called "iNES" make some GPIB controllers
>(http://www.gpib2000.com) but nobody has any real app notes. If anybody has any
>experience
>with GPIB I would appreciate it if I could ask you a few questions.
>Sorry for the OT, but have been researching this for a few weeks and still
>have nothing concrete. Thanks again!!!
http://www.computerboards.com also do an IEEE488 chip - there may be some
info on their website.
Please let me know if you find anything useful - I may need to do an
IEEE488 target sometime soon - I was looking at doing it with a PIC
instead of a 488 chip as throughput will be low.
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2000\09\06@140914 by Barry Gershenfeld

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> If anybody has any experience
>with GPIB I would appreciate it if I could ask you a few questions.
>Sorry for the OT

>Steven Kosmerchock

How OT can this be?  Anyway it depends on your definition of "any".
I did some fooling with GPIB a LONG time ago (remember the Osborne
computer?) I have a dim memory of bit banging but also a magic
controller chip of some sort.  I suspect I got the protocol
by reading the sheets on the chip and then implemented the
bit-bang.  I do have a recollection of chainging the direction
of signal lines, and "talkers" and "listeners".  It was to
make a 9-track tape drive work.  It WAS entertaining.

So if I see a question I know the answer to, I'll chime in. Worth
a shot I guess.

Barry

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2000\09\06@150735 by Olin Lathrop

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> I have always wanted to create my own IEEE-488 interface so I could
> control some external test fixtures using a HPIB card.=
C anybody ever
> interfaced with the GPIB bus? I bought 6 "IOT7210" GPIB controllers
> from I/O Tech (http://www.iotech.com), poor documentation with no app notes.
> I searched TI, National, NEC and a few others but came up with nothing on
> examples. An Agilent rep gave me a link to some documentation they have:
> ftp.agilent.com/pub/mpusup/pc/iop/hpibtut/index.html
> I also found that a company called "iNES" make some GPIB controllers
> (http://www.gpib2000.com) but nobody has any real app notes. If anybody has any
> experience
> with GPIB I would appreciate it if I could ask you a few questions.
> Sorry for the OT, but have been researching this for a few weeks and still
> have nothing concrete. Thanks again!!!

I used to design HPIB industrial equipment for HP in the early 80s, but I no
longer remember all the specifics.  However, HPIB is not a "lightweight"
interface.  There are several parts of the protocol you have to implement,
and some of the handshaking and bus issues can get a bit envolved.  It can
be a very versatile and reasonably high speed local instrumentation bus if
used properly.  I'm not saying to avoid it, but just understand up front
that it's a lot more work to implement than hooking something up via RS-232.
There are also chips available that take care of a lot of the mandatory low
level handshaking for you.

If I was designing new equipment today that I wanted to have hooked up on a
local data bus, I would look into USB and possibly CAN.  Of course these all
have their own baggage.  As always, it depends on your specific situation.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spam_OUTolinTakeThisOuTspamcognivis.com, http://www.cognivis.com

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2000\09\06@215916 by Craig Lee

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Get Testpoint.  Labview and HPVEE are evil!!!

http://www.cec-488.com and http://www.test-point.com

Most everyone makes drivers for Testpoint too.  Check out their
comparison to HP-VEE, Labview, and C/C++ coding.

The only reason Labview is the most common is because NI dumped
their spew all over the market.  Kind of reminds me of Microsoft!

Craig

> {Original Message removed}

2000\09\07@104508 by Andy Jancura

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Hi,

GPIB is standart and you should look for 488.1 and 488.2 specifications. The
first should be for "wire-bus" specifications.

About 8 years ago, I saw solution based on 8051+8255, because the chips from
National were not easy to get at that time. So believe, 17C756 can do all
the jobs and little bit more.

Andrej
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