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This is the only code I could find that mentioned the S-Meter command (which is usually the squelch status command also, in some fashion the documentation does *not* clarify.)
Command 0xE7 is the only status command listed, and one source says that it gets the 'sub vfo' squelch status *and* the signal status.
I regret if this information lacks some of the requested detail. It was about the most informative that I could find.