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Diffstat (limited to 'docs/rvalues.rst')
| -rw-r--r-- | docs/rvalues.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/rvalues.rst b/docs/rvalues.rst index aecb6a6..a8b909e 100644 --- a/docs/rvalues.rst +++ b/docs/rvalues.rst @@ -82,6 +82,17 @@ the IEEE convention. If your instrument uses HP data block you can pass ``header_fmt='hp'`` to ``read_binary_values``. If your instrument does not use any header for the data simply ``header_fmt='empty'``. +By default PyVISA assumes, that the instrument will add the termination +character at the end of the data block and actually makes sure it reads it to +avoid issues. This behavior fits well a number of devices. However some devices +omit the termination character, in which cases the operation will timeout. +In this situation, first makes sure you can actually read from the instrument +by reading the answer using the ``read_raw`` function (you may need to call it +multiple time), and check that the advertized length of the block match what +you get from your instrument (plus the header). If it is so, then you can +safely pass ``expect_termination=False``, and PyVISA will not look for a +termination character at the end of the message. + Writing ASCII values -------------------- |