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Hi Xiangdong,</div>
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I repaired the NI-Serial driver and was able to at least see the RS-485 and RS-232 converters on the PC. I am now updating the NI-Serial driver to see if that fixes everything.</div>
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I remember in the past that this has happened before when the PC reboots or is updated. A similar situation probably happened in this instance.</div>
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-Tyler<br>
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