I'm currently struggling with some new Honeywell pressure sensors that don't behave exactly like the datasheet says. Some of the claims in the datasheet read like wishes.
But yours seem to be functional at least. Isn't the start character the "=" not the "?"? Or do you need to check that it always has the "01CP" in front?
If it doesn't slow you down always sending the command then always send it. The sensor cannot complain that you already asked it a million times.