I added a transmitter module to my Radiomaster TX16S successfully using crossfire protocol as shown on the images. The module communicates to a receiver using the same PCB. The firmware is also in one codebase, this makes the development easy because the same code works for both the transmitter and the receiver.
You can read more about this project on my blog: https://bodrico.com/radiomaster-tx16s-redundant-link/.
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