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manual: hwgrep is the preferred way of specifying a serial device
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@ -89,4 +89,8 @@ feature of pyserial
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`serial_for_url() <http://pyserial.sourceforge.net/pyserial_api.html#serial.serial_for_url>`_
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in order to open a serial device.
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The preferred way to specify a serial device is to make use of the ``hwgrep://``
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URL: it allows to select the serial device by its USB vendor ID, product
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ID and/or serial number. Those never change, unlike the device file name.
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See the :ref:`TDC001 documentation <tdc001-controller-usage-example>` for an example of ``hwgrep://`` usage.
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