Elecraft KX3 Programmers Reference - Manual (Page 24)

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XF $ (XFIL Number; GET only)
RSP format: XFn; where n is the present XFIL selection (1-5) for the target receiver. In the K3, the XFIL
selection refers to crystal filters. In the KX3, the XFIL selection refers to the analog I/Q filters on the KXFL3
module.
XT (XIT Control; GET/SET)
SET/RSP format: XTn; where n is 0 (XIT OFF) or 1 (XIT ON). XIT is disabled in QRQ CW mode.