Elecraft KXPA100 Programmers Reference - Manual (Page 10)

10
^CR (ATU Select Capacitors, GET and SET)
GET format: ^CR;
SET/RESPONSE format: ^Chh; where hh are two hexadecimal digits indicating the selected capacitors.
See http://en.wikipedia.org/wiki/Hexadecimal for a description of this notation.
Examples:
^CR00; selects no capacitors.
^CRFF; selects all capacitors.
^CR80; selects only the largest capacitor.
^CRC1; selects the largest, second largest, and smallest capacitors.
Hex Digits Relay Capacitance (pF)
80 K116 1360
40 K115 660
20 K114 300
10 K113 150
08 K112 82
04 K111 40
02 K110 22
01 K109 10
The KXPA Utility Operate page displays capacitor relay settings as check boxes and as a total
capacitance.
It may take a few tens of milliseconds after issuing ^CR before the relays are changed.
Capacitor settings are changed by ATU tuning operations. ^CR set is ignored while tuning.
Capacitor relays are released while the ATU bypass relay is in its bypassed setting.
^CR is meaningful only if the optional KXAT100 Antenna Tuner is installed.