Labeling

I have this IR to RF and RF to IR converting gizmos.

Would you label the IR receiver as Tx and the IR transmitter as Rx like mine are labeled from the factory?

I know, they did it with respect to RF, but who cares what the medium is. I think of the IR being received and IR being transmitted. What if the medium was Ethernet?

Just rambling.

Yes but its a converter.
So the original medium does not count for naming purposes just the converted signal.
Think of a RC car the transmitter does not care where it gets its signal from it just transmits it.

I would reach the same conclusion, but my analogy would be to simplex communication. The definitions are based on the direction of information flow.
https://en.wikipedia.org/wiki/Simplex_communication

John

These https://www.xantech.com/Infrared/Infrared/DLPCRTRcvrs/ guys call their devices IR emitters and receivers. which to me makes sense.

Not Tx and Rx.

I think the same way; IR is emitter - detector. (Tx - Rx) seems more Serial RS-232, Visca or Ethernet.