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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: problem with usbtmc-communication
Date: Wed, 05 Dec 2012 18:08:08 -0500
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Xref: csiph.com comp.lang.python:34341

On Wed, 5 Dec 2012 12:38:04 -0800 (PST), Jean Dubois
<jeandubois314@gmail.com> declaimed the following in
gmane.comp.python.general:

> This is the information concerning usbtmc from the National
> Instruments site:
> USBTMC stands for USB Test & Measurement Class. USBTMC is a protocol
> built on top of USB that allows GPIB-like communication with USB
> devices. From the user's point of view, the USB device behaves just
> like a GPIB device. For example, you can use VISA Write to send the
> *IDN? query and use VISA Read to get the response. The USBTMC protocol
> supports service request, triggers and other GPIB specific operations.
>

	Off-hand, that seems to imply that you might need a GPIB library to
talk to the "virtual" GPIB provided by USBTMC -- or something that talks
to the USBTMC library directly.

	Note that the NEXT paragraph reads:

NI> SBTMC allows instrument manufacturers to upgrade the physical layer
from GPIB to USB while maintaining software compatibility with existing
software, such as instrument drivers and any application that uses VISA.
This is also what the VXI-11 protocol provides for TCP/IP. 

	So now you have to consider what "VISA" is...

http://digital.ni.com/manuals.nsf/websearch/21992F3750B967ED86256F47007B00B3

	Since usable from M$ VB the question becomes: .NET or native API...
If native API, the win32 extension library on Windows should allow for
using the API from Python. If .NET, the ctypes library may allow access.
NOTE: I've not bothered downloading the docs -- it's your hardware <G>




-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/