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Sets the mode to use for the laser power servo.
0 - Adjusts laser current to match wpower setpoint at a rate determined by the
setting of "wsample".
3 - As mode 0 but only adjust laser power when not over the plate. While over
the plate hold the last current. This mode needs to be used on highly
refective media since otherwise the back reflection can interfere with the
power measurement.
Modes 1 or 2 which are exposure modes are available starting with thermal head
firmware 1.50 (needs matching MPE version as well). Mode 1 and 2 are identical
to modes 0 and 3 respectively except that the setpoint value ("hdm wpowere") is
automatically modified every time the machine is reset, the media type changed
or the "sys tstk" timer times out. The wpowere value is calculated from the
power out of the head as measured by the nose piece sensor, the drum speed, the
swath width, the drum diameter and the media sensitivity as specified in "media
sens".
For both modes 0 and 3 the "hdm wpower" setting is the laser servo setpoint
while for modes 1 and 2 "hdm wpowere" is the setpoint.
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