At (enable/disable attenuator, get and set) – Elecraft KXPA100 Programmers Reference User Manual

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^AT (Enable/Disable Attenuator, GET and SET)

GET format: ^AT;

SET/RESPONSE format: ^AT0; (disabled) or ^AT1; (enabled). The response ^AT2; is returned if the
attenuator is engaged by the back panel switch.

Energizes (^AT1;) or releases (^AT0;) the attenuator relay, K203. If the back panel 3 dB ATTEN switch is
ON, the ^AT setter has no effect.

It may take a few tens of milliseconds after issuing an ^AT setter before the relay is changed.

Firmware enables the attenuator as needed to protect the amplifier, and may release it after a period
without transmission.