If you would like to use original LEGO MindStorms Robotics Invention System simple transceiver won't be enough.
I've found schematic on eurobricks forum - it looks you have to emulate CTS signal also.
My copy of this circuit:
Reverse-engineered by Mark Bellis the serial port tower from my RCX 1.0 kit
You can find this schematic also on other pages (ie. LEGO MINDSTORMS Internals).
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