Elecraft KAT500 Serial Command Reference - Manual (Page 11)

This command was introduced in firmware version 01.29
FT (Full Tune, SET only, with response)
SET/RESPONSE format: FT;
FT; starts a Full Tune. If Mode is Bypass, the Mode is changed to Manual. An FT; RESPONSE is sent when
a Full Tune initiated by T; or FT; completes.
Full Tune may not start immediately if the current transmit power exceeds the AKIP threshold. When
you next stop transmitting, KAT500 firmware interrupts the amplifier key line. Start transmitting again at
about 15 to 30 watts. When tune completes, an FT response is sent. You should stop transmitting, and
KAT500 firmware will then reconnect the amplifier key line.
If the amplifier’s T/R switch is able to handle full-power switching (indicated by setting AKIP to 1500),
amplifier key line interrupt, tuning, and key line reconnect occur without requiring a pause in
transmission.
I (Identify, GET only)
GET format: I;
RESPONSE format: KAT500;
KAT500 permanent boot block firmware responds with “kat500;” in lower case.
L (Select Inductors, GET and SET)
GET format: L;
SET/RESPONSE format: Lhh; where hh are hexadecimal digits (0-9 and A-F) indicating the selected
inductors.
Examples:
L00; selects no inductors
LFF; selects all inductors
L80; selects only the largest inductor by energizing K17
LE0; selects the three largest inductors by energizing K17, K16, and K15.
See the C command for a description of hexadecimal notation.
The KAT500 Utility Operate page displays the relay settings as check boxes and total inductance.
Hex digit Relay Inductance (nH)
80 K17 9000
40 K16 4400