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The NUC is not outfitted with an exposed RS232c-style serial port. Some NUC models have an internal expansion connector that allows you do gain access to, for example, serial bit buses like i2c and SMBus. Be aware, however, that the presence and features of the expansion connectors differ from one NUC model to another.
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Thank you very much to N.Scott.Pearson for the information posted previously.
I hope that the information posted above was useful for you and now you have the information you needed.
Also, the following link is for the forums of our developer zone, in there you might get further details from different peers:
Any further questions, please let me know.