Paralell talking on the GPIB bus

[MimiKLM]

Hi,

My system uses GPIB bus. I controll that using VISA libraries from LV.

One controller and ten devices connecet to the bus.

Can I have two session opened - one sesion per device - and receive (to the controller) the data from both of them simultanousely?

[crossrulz]

You can only talk with one instrument at a time due to hardware reasons.  But the hardware can figure that out.  Just understand that they won't be EXACTLY in parallel.

[MimiKLM]

OK,

Is it a GPIB limitation? What happen if I use LAN instead GPIB?

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@crossrulz wrote:

You can only talk with one instrument at a time due to hardware reasons. (...)

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Is it an assumption of the GPIB bus? Could you refer me to any document which states this?

[Albert.Geven]

the only parallel action on gpib is the GET this means Group Execute Trigger.

On LAN also only a message can be sent to one receiver, so no parallellism

[crossrulz]

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@MimiKLM wrote:

Is it an assumption of the GPIB bus? Could you refer me to any document which states this?

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LAN has the same issue.  It is a matter of having only one bus that can be talked over at a time.  But the transmission is fast enough that you won't notice.

If you try to send a command through VISA to multiple instruments, it will be a race condition of which one will talk first.  99% of the time, it doesn't matter since the second one will talk as soon as the first is done.

[Dennis_Knutson]

Please look at triggering if you are concerned at simultaneous acquisition. There is the software GET that Albert mentions and external hardware triggers.