Elecraft KAT500 Serial Command Reference - Manual (Page 4)

Commands and responses
; (null command, GET only)
GET format: ;
RESPONSE format: ;
The KAT500 Utility sends a few semicolons to determine the serial port speed during a connection
sequence and to wake up a sleeping microcontroller.
AE (Antenna Enable, GET and SET)
GET format: AEbba;
SET/RESPONSE format: AEbba0; for disable; AEbba1; for enable.
Enables or disables an antenna connector for a specified band. bb is the band number, see the BN
command. a is the antenna number: 1, 2, or 3. Disabled antennas are skipped by the ANT button.
Example: AE0030; disables ANT3 on 160 meters. AE1031; enables ANT3 on 6 meters.
Disabling the currently used antenna may result in a KAT500 ANT selection change.
This command is used by the KAT500 Utility Edit Configuration dialog Antennas tab.
AFT (Automatic Fine Tune, GET and SET)
GET format: AFTbb;
SET/RESPONSE format: AFTbb0; (disabled) or AFTbb1; (enabled) where bb is a Band Number (see BN).
For example, AFT031; enables this capability on Band Number 03, which is 40 meters.
Full search tune starts with a “coarse” step that tests several inductance values to find an approximate
starting point for finer granularity searches. In some cases with high SWR antennas, particularly on low
bands, not enough inductance values are tested to find a good starting point. Enabling AFT causes full
search coarse tune to try more inductor settings. Full search coarse tune takes longer, but may find
matching solutions for some difficult antenna loads that are not otherwise found.
This command is used by the KAT500 Utility Edit Configuration Auto Fine Tune tab.
AFT was added in firmware version 01.39.
AKIP (Amplifier Key Interrupt Power Threshold, GET and SET)
GET format: AKIP;
RESPONSE format: AKIP wwwwW VFWD aaaa;