The IC-7851 rejects "27 11 01" and wants "27 11 00 01" — the main/sub selector
its two scopes need. The shape was picked from a list of CI-V addresses, so an
address not on it got the wrong one and the scope stayed blank with a rejection
in the log and nothing on screen.
A rejection is an unambiguous answer, so a rejected 0x27 set is now re-sent in
the other shape and the winner remembered. A TIMEOUT deliberately is not
retried: several firmwares never ack a 0x27 set, and treating silence as a
wrong guess would flip a rig that was already working.
rouggy
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