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+"""
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+Device constants are used during instantiation of interface classes (such as
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+:class:`alphasign.interfaces.local.USB`) to describe particular sign devices.
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+
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+The following constants are defined in this module:
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+
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+* :const:`USB_BETABRITE_PRISM` = (0x8765, 0x1234)
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+
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+--------
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+Examples
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+--------
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+
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+Connect to a BetaBrite Prism sign using USB::
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+
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+ sign = alphasign.USB(alphasign.devices.USB_BETABRITE_PRISM)
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+ sign.connect()
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+ ...
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+"""
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+
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+USB_BETABRITE_PRISM = (0x8765, 0x1234)
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