Elecraft KXPA100 Programmers Reference - Manual (Page 5)

5
Commands and responses
; (Null, GET only)
GET format: ;
RESPONSE format: ;
KXPA100 firmware echoes a semicolon. The KXPA Utility sends two semicolons to determine the PC
DATA serial port speed during a connection sequence.
This command is not forwarded to the KX3.
^AD (Dynamic attenuator reason, GET only)
GET format: ^AD;
RESPONSE format: ^ADx;
Returns a character indicating the reason the attenuator was most recently deployed by firmware:
^AD; response Reason
^ADD; Dissipated power limit was reached
^ADF; Forward power limit was reached
^ADI; Input power limit was reached
^ADJ; JA Mobile power limit was reached
^ADN; The attenuator has not been deployed by
firmware since the last power on
^ADV; Reverse (reflected) power limit was reached