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From: Mark on 2 May 2010 07:23
"Ankit Desai" <adesai.nospam(a)mathworks.com> wrote in message <grl2n5$14p$1(a)fred.mathworks.com>...
> "Pierangelo " <pierangelo.bolognini(a)it.abb.com> wrote in message <grkcpt$roo$1(a)fred.mathworks.com>...
> > Hi all,
> > I'm using MATLAB to acquire data from instruments by GPIB interface.
> > What is the maximum dimension for the gpib InputBufferSize?
> > I need about 64KB but it seems that it works only until 8KB...
> >
> > Anybody knows why?
> > Thank you very much
>
> Hi Pierangelo,
>
> I am guessing you created a GPIB object using Instrument Control Toolbox:
>
> gpibObj = gpib(<vendor>, <boardID> , <primary address>);
>
> At this state you should be able to increase the input buffer size by:
>
> gpibObj.InputBufferSize = 100000;
>
> And open it:
>
> fopen(gpibObj);
>
> I do not encounter any issue making inputbuffersize to 64KB.
>
> You can find more details at:
>
> http://www.mathworks.com/access/helpdesk/help/toolbox/instrument/f13-42284.html
>
> Hope this helps
>
> -Ankit

Could anyone tell me what the effect is of increasing the (output)buffersize on the data flow? I don't suppose I can increase it without sacrifice...
I'm actually using USB via a virtual COM, but the idea remains the same I suppose.
From: Ankit Desai on 3 May 2010 22:25
"Mark " <markmatlab(a)gmail.com> wrote in message <hrjnao$co0$1(a)fred.mathworks.com>...
> "Ankit Desai" <adesai.nospam(a)mathworks.com> wrote in message <grl2n5$14p$1(a)fred.mathworks.com>...
> > "Pierangelo " <pierangelo.bolognini(a)it.abb.com> wrote in message <grkcpt$roo$1(a)fred.mathworks.com>...
> > > Hi all,
> > > I'm using MATLAB to acquire data from instruments by GPIB interface.
> > > What is the maximum dimension for the gpib InputBufferSize?
> > > I need about 64KB but it seems that it works only until 8KB...
> > >
> > > Anybody knows why?
> > > Thank you very much
> >
> > Hi Pierangelo,
> >
> > I am guessing you created a GPIB object using Instrument Control Toolbox:
> >
> > gpibObj = gpib(<vendor>, <boardID> , <primary address>);
> >
> > At this state you should be able to increase the input buffer size by:
> >
> > gpibObj.InputBufferSize = 100000;
> >
> > And open it:
> >
> > fopen(gpibObj);
> >
> > I do not encounter any issue making inputbuffersize to 64KB.
> >
> > You can find more details at:
> >
> > http://www.mathworks.com/access/helpdesk/help/toolbox/instrument/f13-42284.html
> >
> > Hope this helps
> >
> > -Ankit
>
> Could anyone tell me what the effect is of increasing the (output)buffersize on the data flow? I don't suppose I can increase it without sacrifice...
> I'm actually using USB via a virtual COM, but the idea remains the same I suppose.

Hi Mark,

Increasing the outputbuffersize allows you to send (using fwrite and/or fprintf) larger data size. While increasing the inputbuffersize allows you to receive (using fread and/or fscanf) larger data size.

Hope this helps,

-Ankit
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