In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

If you want to use just one pin for bi-directional communications put a pull-up (4.7K) on one side and a 470 or 1K between the two; the series resistor will prevent a problem in the event one side is driven high while the other is driven low.  Use OT (open true) serial comms, and don't forget to connect ground between the two boards.

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