Is there an existing port on the CR10X that can house a RS-232 one-wire interface device?

Instruction 15, Control Port Serial I/O, does allow the use of one control port for hardware flow control (RTS/DTR) or (TXD/RXD). The first control port is the (RTS/DTR) line. Baud rate is limited to 300 or 1200. 

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