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Moves the TAURUS etalon wheel to the specified position.
Format: ETALON <position>
Range: <position> is an integer in the range --6 to 6 or the name of the etalon.
Defaults: None
Examples : ETALON 3 or ETALON 125UM
Comments: There are 6 positions in the etalon wheel. Positions 1, 2, 4 and 5 can be used to hold Fabry-Perot etalons, whilst positions 3 and 6 are always left empty for imaging observations. The position of the wheel can be selected either by specifying a number between --6 and 6, or by specifying the etalon name. In normal operation the parameter should be positive. If the parameter is negative, the wheel will not be clamped on completion of the move, and the position of the wheel will become undefined.