Elecraft KXPA100 Programmers Reference - Manual (Page 21)

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^SM (ATU Save Memory, SET only)
SET format: ^SM; or ^SMfffff; where fffff is a frequency in kHz.
^SM saves the current tuner settings (bypass and side, inductor, capacitor) in the memory for the
indicated (or most recent transmit) frequency.
If fffff is zero or missing, the last Transmit frequency is used. If transmitting, the measured transmit
frequency is used.
^SM; is used by the KXPA Utility Operate Page Memorize button.
This command is meaningful only if the optional KXAT100 Antenna Tuner is installed.
^SM may be used to store an ATU setting for a receive-only frequency, or to override the setting stored
by the antenna tuner’s full search.
^SN (Serial Number, GET only)
GET format: ^SN;
RESPONSE format: ^SNnnnnn;
The serial number is installed during factory initialization and remains unchanged thereafter.
^SV (Supply Voltage, GET only)
GET format: ^SV;
RESPONSE format: ^SVnnnnn; where nnnnn is the DC power supply voltage in millivolts.
Example response: ^SV13400; for 13.400 volts.
^SW (SWR, GET only)
GET format: ^SW;
RESPONSE format: ^SWnn.n; Range is ^SW00.0; to ^SW99.9; for 99.9 to 1 or higher SWR.
Displays the SWR computed at the most recent forward power peak.
^TM (Temperature, GET only)
GET format: ^TM;
RESPONSE format: ^TMtttt; where tttt is the PA heat sink temperature in tenths of a degree Celsius.
For example, ^TM0271; indicates a temperature of 27.1 degrees Celsius.