One package for both amplifiers: they share the Elecraft command set — a
caret, letters, a semicolon, case-insensitive in and upper case out — the
same family as the K3/K4 panel. What differs is the transport and which
commands exist, not the grammar.
Everything here comes from the KPA1500 Programming Reference, and the
document's own examples ARE the test:
^WS1204 014; 1204 W and SWR 1.4:1 — power and SWR in one exchange
^VI513 061; 51.3 V and 61 A — volts in tenths, amps whole
^FL91; HEX, and 0x91 is 'antenna not connected?'
That last one is why the parsing is pinned rather than eyeballed: read as
decimal, 90 and 91 become 144 and 145 and match nothing, so an amplifier
shut down by high reflected power would report a fault OpsLog could not
name. SWR in tenths is confirmed by the reference too — 'expressed in
tenths, 123 is 12.3:1' — where it had only been inferred from Hamlib.
The client is question-and-answer under one lock, never two questions in
flight: the reference states there is no flow control and that commands
are paced by waiting for the reply. Fast cycle four times a second for
power, SWR and the fault; the rest once a second.
Faults are named in the operator's terms — 'the ATU found no match', not
'fault 92' — and an unknown code from a newer firmware still says
something rather than nothing.
Not wired to the app yet, and two commands are deliberately absent: ^TX
makes the amplifier transmit from software, and ^ON0 cuts the main
supplies with Wake-on-LAN as the way back. Neither belongs on a poll loop
or behind a button that can be pressed by accident.
