The same ASCII stream over a socket instead of a wire: ser2net, an
Ethernet-serial adapter, a Raspberry Pi at the radio. One TCP transport
presented as a serial port, so the backend keeps a single code path.
Explicitly NOT the radio's own RJ45. A TS-890 or TS-990 speaks Kenwood's
KNS/ARCP there — session, authentication, a different protocol — and that needs
one of those radios in hand to write honestly. The setting's help text says so,
because an operator who plugs in their TS-890's Ethernet port and types its
address deserves to learn that from the interface rather than from silence.
Two details that decide whether this is usable or maddening:
- A read deadline expiring is reported as "no data yet", not as an error. It
is exactly what a serial read timeout means to the caller; as an error it
would make ask() abandon a rig that is merely thinking.
- The log line names what was connected to. "connected on @ 0 baud" after a
network connect sends someone hunting a serial fault that does not exist.
The host wins over the COM port when both are filled: it is the more deliberate
setting, and silently preferring the wire leaves someone staring at an address
they typed and a radio that never answers.
Reported from a Flex in Kenwood CAT mode: frequency read perfectly, split never
appeared. Not every rig speaking this dialect fills IF's split bit.
Rather than guess which column that firmware populates, ask the question that
DEFINES split — is the transmit VFO a different VFO from the receive one — which
is exactly what FR and FT answer, and the same rule the Yaesu backend settled on
after several wrong turns. FR is also trusted over IF for which VFO is in use:
they are asked in the same breath, and a rig vague about the split bit may be
just as vague about the VFO field.
Cost is bounded: a rig that rejects FR/FT answers "?;" once and is never asked
again, so this is two short commands per poll only where it works. Both paths
are tested against the emulator — split found through FR/FT with IF silent, and
IF-reported split still working on a rig that refuses FR/FT without re-asking.
Also extends the CAT wire trace to the Kenwood backend, ASCII quoted so an empty
reply is visible as such: "" and ";" look identical unquoted, and telling them
apart is the whole question when a rig half-supports a command. If this fix is
not the whole story on real hardware, the trace is what will say so.
Nobody here owns a Kenwood, and a backend that has never completed a single
exchange is a guess however carefully it was written.
But this repository already contains the other half of the conversation:
internal/catemu ANSWERS this dialect, pretending to be a TS-2000 so an ACOM
amplifier follows OpsLog. The test's responder replies exactly as catemu does —
same FA/FB widths, same 38-character IF layout, same ID019 — so the two halves
are checked against each other instead of against my reading of a manual.
Connect adds a dialPort seam for this; nothing else changed in the backend.
Covered: model identification, simplex on A, everything following the VFO in
use when on B, tuning writing to that VFO rather than blindly to FA, split with
TX and RX the right way round (ADIF FREQ is the TRANSMIT frequency — swapping
them writes the wrong frequency into every logged QSO), the mode digit, and a
silent port reported as not answering rather than as a connected radio. The last
three are each a fault that actually reached a user through the Yaesu backend.
What this does NOT prove: that a real TS-590 answers on the same timings, or
fills every IF field the way its documentation says. That still needs a radio.
A sixth CAT backend, talking to a TS-590/890/990/2000 over its serial port with
no OmniRig in between — frequency, mode, VFO, split and PTT. Elecraft K3/K4 and
the "Kenwood" setting on other radios speak the same dialect.
The protocol was not researched from scratch: internal/catemu already ANSWERS
these commands, pretending to be a TS-2000 so an ACOM amplifier follows OpsLog.
The IF frame layout here is read from the same format string catemu emits, so
the two halves of the repository agree by construction — and the test caught my
own fixture being one character short, which is exactly the error that layout
invites.
Design notes worth keeping:
- IF; is the poll. One frame carries frequency, TX state, mode, VFO and split,
so simplex operation costs a single round trip; the other VFO is only asked
for when split is actually on.
- FA/FB take ELEVEN digits here where Yaesu uses nine. That is the likeliest
place to copy the Yaesu backend and be wrong by a factor of a hundred, so it
has its own test.
- Every lesson the Yaesu backend learned the hard way is built in from the
start: replies matched to the command that asked, "?;" remembered so a poll
stops paying a timeout for an unsupported command, the serial handle closed
before reopening, and a rig that answers nothing reported as absent rather
than "connected".
Untested on hardware — I have no Kenwood here. The frame parsing is covered by
tests against catemu's own format.
rouggy