Sets/queries the RF output port destination: RF IN/OUT (IO) or RF OUT ONLY (OUT).
The correct hardware for a requested setting must be present or an error is generated. For example, trying to change to the RF OUT ONLY port when this port is not installed causes the test set to display the following error:
Hardware error; RFIO version does not support RF out only selection.
The query form of this command will always return a result, regardless of the hardware version.
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