The IC-7851 rejects 0x27 0x11 in BOTH shapes: on that radio 0x27 0x10 is the
waveform-output switch itself, not a display switch. Rejected both ways, take
0x10 as the output command and switch it off on disable too — there it stops a
stream rather than blanking the operator's own scope screen.
A mode/span/edge answer also settles the selector question directly: three bytes
or more means the rig wants the main/sub form. Worth reading, because a
wrong-shaped SET is answered with silence on this firmware, and a timeout is
something the rejection retry cannot act on — which is why the fixed/centre
sets were timing out.
rouggy
69d78ba8c0