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diff --git a/docs/configuring.rst b/docs/configuring.rst index 867722e..02bce68 100644 --- a/docs/configuring.rst +++ b/docs/configuring.rst @@ -2,27 +2,31 @@ Configuring the backend ============================ -Currently there are two backends available: The one included in pyvisa which -uses the NI library. This is used by default and the configuration is described -in the next chapter. -And then there is pyvia-py a pure python implementation of the VISA libary. -It can be selected by passing a parameter to the ResourceManager: + +Currently there are two backends available: The one included in pyvisa, which +uses the NI library, and the backend provided by pyvisa-py, which is a pure python implementation of the VISA library. +If no backend is specified, pyvisa uses the NI backend if the NI library has been installed (see next section for details). Failing that, it uses the pyvisa-py backend. + +You can also select a desired backend by passing a parameter to the ResourceManager, shown here for pyvisa-py: >>> visa.ResourceManager('@py') -Alternativly it can also be selected by setting the environment variable +Alternatively it can also be selected by setting the environment variable PYVISA_LIBRARY. It takes the same values as the ResourceManager constructor. Configuring the NI backend ========================== -.. note:: The NI backend requires that you install first the NI-VISA library. You can get - info here: (:ref:`getting_nivisa`) +.. note:: + + The NI backend requires that you install first the NI-VISA library. You can + get info here: (:ref:`getting_nivisa`) -In most cases PyVISA will be able to find the location of the shared visa library. -If this does not work or you want to use another one, you need to provide the library -path to the :class:`pyvisa.highlevel.ResourceManager` constructor:: +In most cases PyVISA will be able to find the location of the shared visa +library. If this does not work or you want to use another one, you need to +provide the library path to the :class:`pyvisa.highlevel.ResourceManager` +constructor:: >>> rm = ResourceManager('Path to library') @@ -65,9 +69,9 @@ You can define a site-wide configuration file at Under Windows, this file is usually placed at :file:`c:\\Python27\\share\\pyvisa\\.pyvisarc`. -If you encounter any problem, take a look at the :ref:`faq`. There you will find the -solutions to common problem as well as useful debugging techniques. If everything fails, -feel free to open an issue in our `issue tracker`_ +If you encounter any problem, take a look at the :ref:`faq`. There you will +find the solutions to common problem as well as useful debugging techniques. If +everything fails, feel free to open an issue in our `issue tracker`_ .. _`home directory`: http://en.wikipedia.org/wiki/Home_directory .. _`issue tracker`: https://github.com/pyvisa/pyvisa/issues |