Elecraft KXPA100 Programmers Reference - Manual (Page 17)

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^MD (ATU Mode, GET and SET)
GET format: ^MD;
SET/RESPONSE format: ^MDB; or ^MDM; or ^MDA;
^MDB; is “Bypass” mode. The bypass relay is released to its Bypassed setting and the KXPA100 does not
attempt to tune. A TUNE button press changes the mode to Manual and initiates a full search tune.
^MDM; is “Manual” mode. In “manual” mode, the KXPA100 recalls tuner settings memorized from a
prior tune whenever the antenna changes or the frequency changes significantly. A TUNE button press
also used to initiate a full search tune.
^MDA; is “Automatic” mode. The KXPA100 recalls memorized tuner settings on frequency change, and
performs a full search tune if the SWR exceeds a threshold (typically 1.8:1). A TUNE button press also
initiates a full search tune.
^MD set may be ignored while transmitting.
Mode is changed from Bypass to Manual if an ATU tune is initiated (^MT, ^FT, or front panel TUNE
button press).
This command is meaningful only if the optional KXAT100 Antenna Tuner option is installed.
^MT (ATU Memory Recall Tune, SET only)
SET format: ^MT; to perform a memory recall tune on the current Transmit frequency, or
^MTfffff; where fffff is a frequency, in kHz.
^MT performs a “memory recall tune” by changing to the memorized tuner setting for the current
antenna.
If fffff is zero or missing, the last Transmit frequency is used. If the amplifier is currently transmitting, the
measured transmit frequency is used instead of fffff.
If there is no memorized tuner setting for the specified frequency, adjacent memories are searched
above and below the specified frequency, as far as the band edges, until a suitable memory is found.
If no KXAT100 Automatic Antenna tuner is installed, ^MTfffff; performs a band switch to the appropriate
band.