Turns ON/OFF the marker.
Turning ON a marker with the number from 1 to 15 will turn ON all
the markers of smaller numbers. Turning OFF a marker with the
number from 1 to 15 will turn OFF all the markers of greater
numbers (except of the reference marker with number 16). Turning
ON/OFF the reference marker with number 16 does not turn
ON/OFF the markers with the numbers from 1 to 15, but switchs
these markers between relative and absolute measurement mode.
(command/query)