Elecraft KXPA100 Programmers Reference - Manual (Page 16)

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^LR (ATU Select Inductors, GET and SET)
GET format: ^LR;
SET/RESPONSE format: ^LRhh; where hh are hexadecimal digits (0-9 and A-F) indicating the selected
inductors.
Examples:
^LR00; selects no inductors
^LRFF; selects all inductors
^LR80; selects only the largest inductor.
^LRE0; selects the three largest inductors.
See http://en.wikipedia.org/wiki/Hexadecimal for a description of hexadecimal notation.
The KXPA Utility Operate page displays the relay settings as check boxes and total inductance.
Hex digits Relay activated Inductance (nH)
80 K108 9000
40 K107 4400
20 K106 2100
10 K105 1000
08 K104 480
04 K103 230
02 K102 110
01 K101 50
It may take a few tens of milliseconds after issuing ^Lxx; before the relays are changed.
Inductor relays are released whenever the bypass relay is in bypass (^BYPB;).
Inductor relays are changed by ATU tuning. ^LR is ignored during ATU tune.
^LR is meaningful only if the optional KXAT100 Antenna Tuner is installed.