The IRC pin allows a flight controller to change the channnel and power output of the VTX. Not used for basic camera only setups.
Some VTXes can be controlled by a LUA radio script over ESP32 ELRS receivers too. https://www.expresslrs.org/software/serialvtx/
EDIT: This one "should" be able to use the ELRS VTX controls since it uses IRC protocol....

Some VTXes can be controlled by a LUA radio script over ESP32 ELRS receivers too. https://www.expresslrs.org/software/serialvtx/
EDIT: This one "should" be able to use the ELRS VTX controls since it uses IRC protocol....
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