Re: [Linux-gpib-general] Which Agilent GPIB PCI card to buy?

[daturach <dat...@gm...>]

Hello Alex

I am using a PCI-GPIB model fitted in an old PC. It's just for the fun of
driving an old Marconi 2955. These boards are quite cheap. You should be
able to get one for 100 bucks or so.

Walter


Le mer. 15 janv. 2020 à 16:12, Alexander Huemer <ale...@xx...> a
écrit :

> Hi
>
> Thanks for the insights.
> A friend of mine suggested to use National Instruments card instead of
> HP.
> Taking a look at the supported-hardware page I don't see any notes for
> the NI PCI cards, which makes me believe they have proper end-of-string
> detection, therefore better performance and hence the better choice than
> HP.
> Is that a correct conclusion?
>
> It seems like there are a number of different models available from NI.
> Anything in particular to prefer?
>
> Thanks,
> -Alex
>
> On Fri, Jan 10, 2020 at 04:02:07PM +0100, dave penkler wrote:
> > Hallo Alexander,
> > From a user perspective they are pretty much the same as they use the
> same
> > driver. The main difference is that the 82350A requires a firmware
> > udownload when initialising it. So the 82350B is preferable from that
> > point. See aslo
> >
> https://linux-gpib.sourceforge.io/doc_html/supported-hardware.html#AGILENT-82350B
> >
> > Regarding the non-system controller aspect: the cards can be used in this
> > mode but you need to understand the gpib protocol to program it.
> > A simple example is here:
> >
> https://sourceforge.net/p/linux-gpib/code/HEAD/tree/trunk/linux-gpib-user/examples/slave_read_to_file.c
> > cheers,
> > -Dave
> >
> > On Fri, 10 Jan 2020 at 13:41, Alexander Huemer <ale...@xx...>
> > wrote:
> >
> > > Hi
> > >
> > > I would like to build a small box based on a Soekris 5501 to be able to
> > > interface various pieces of old test equipment via GPIB.
> > >
> > > In case that matters, the test equipment I have with GPIB interfaces
> > > are:
> > > * HP 54200A (Oscilloscope)
> > > * HP 66311B (Power supply)
> > > * HP  3478A (Multimeter)
> > > * Rohde & Schwarz CMD53 (Digital Radiocommunication Tester)
> > >
> > > I am considering to buy either:
> > > * HP 82350A Rev. B
> > > * HP 82350B Rev. A
> > >
> > > My question is whether there are any real-world differences between
> > > these cards from user perspective.
> > > Looking at pictures of the boards, the implementations seems to be
> > > significantly different. Having no practical experience with linux-gpib
> > > yet, I cannot say whether those differences have any effect to the
> user.
> > >
> > > * HP 82350A Rev. B -> Xilinx XC5202 + PLX PCI9050
> > > * HP 82350B Rev. A -> Xilinx XC2S100, no PLX
> > >
> > > My guess would be 'no difference', though I thought I'd ask before I
> > > buy.
> > >
> > > Second question:
> > > Can these boards act as non-controllers on the bus? I wasn't able to
> > > find a good explanation of the technical situation in English, only in
> > > German[1] (my mother tongue).
> > > Long story short: Some GPIB adapters for general purpose computers can
> > > react to ATN messages on the bus quickly enough to be able to act as
> > > non-controllers, some aren't. The time budget is pretty tight for that,
> > > 200ns, too quickly for interrupt-based implementations.
> > >
> > > I believe the ATN responses are the reason one would want to use a PCI
> > > board instead of a 82357A/B.
> > > Whether that ATN thing is significantly relevant in another can of
> > > worms, though we don't have to open that can of worms right now.
> > >
> > > -Alex
> > >
> > > [1] https://www.mikrocontroller.net/articles/GPIB-RS232-Schnittstelle
> > >
> > >
> > > _______________________________________________
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> > > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general
> > >
>
>
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