On the .begin() function theres the chance to use a second argument "config" which adjusts parity, number of bits in the data and stop bits. Serial.begin() - Arduino Reference The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure key…

Serial config, Stop Bits

system November 8, 2017, 2:26pm 4

...and a few extra null characters after a carriage return.
BT,DT.

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