Usb device fixes#205

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jayich wants to merge 7 commits intolabrad:masterfrom

CampbellGroup:USB_device_fixes

Commits on Jul 16, 2015

For USB devices the physical address is sufficient for the only two USB devices we have tested, a Rigol DG1022 and an Agilent DSO1024A. If other devices require adding '::INSTR' perhaps parsing ad…
jayich
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We found that for two of our devices, a Rigol DG1022 and an Agilent DSO1024A, that we could not get proper communication without an asynchronous wait. If there is a better solution for this proble…
jayich
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