Elecraft KXPA100 Programmers Reference - Manual (Page 6)

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^AE (Antenna Enable, GET and SET)
Antenna Enable is used to enable or disable each of the KXPA100 antenna connectors, by band. This may
be used to prevent accidental switching to an unconnected antenna.
GET format (single band): ^AEbb; where bb is the Band Number 00 through 10 (see BN; command).
SET/RESPONSE format (single band): ^AEbbn; where bb is the Band Number 00 through 10 and n is a
digit from 1 through 3 indicating which antenna connectors are enabled:
1 Only ANT1 is enabled, ANT2 is disabled
2 Only ANT2 is enabled , ANT1 is disabled
3 ANT1 and ANT2 are both enabled. This is the default value.
GET format (all bands): ^AEA;
SET/RESPONSE format (all bands): ^AEAnnnnnnnnnnn; where nnnnnnnnnnn has one digit for each of
11 bands, 160 through 10 meters.
Abbreviated SET format to set all bands to the same value: ^AEAn;
For example, ^AEA1; has the same result as entering ^AEA11111111111; or
^AE001;^AE011;^AE021;AE031;AE041;AE051;AE061;AE071;AE081;AE091;AE101;
AE is meaningful only if the optional KXAT100 Antenna Tuner is installed.
AE was added in firmware version 01.18.
^AN (ATU Select Antenna, GET and SET)
GET format: ^AN;
SET/RESPONSE format: ^AN1; ^AN2;
It may take a few tens of milliseconds after issuing an ^ANx setter before the relays are changed.
The SET form of this command is ignored while transmitting or tuning, or the antenna is disabled (see
AE).
Set form AN0; is interpreted as “advance to next antenna”, equivalent to HOLD of the ANT button.
This command is meaningful only if the optional KXAT100 Antenna Tuner is installed.