IMHO this doesn't refer to X window system but to a so called cross connection, like a 
null modem cable. Means: you have to wire

Tx -- Rx
Rx -- Tx
GND -- GND

If your board gets ground from a power supply or so you might even save the GND 
connection, but not if it's battery powered.

Here the X stands for cross. 
If my guesses are all wrong, let me know.

Dex
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