SHU(OPCS)		Optical Printer Control System		SHU(OPCS)

    NAME
        shu - move the fader to an absolute position in degrees

    USAGE
        shu [degrees]

    EXAMPLE
	shu 80.20     # move fader shutter to 80.20 degrees
	shu 0         # fully close the fader shutter

    DESCRIPTION
        Allows the operator to move the fader shutter to the absolute [degrees]
	position (in floating point degrees), and must be in the range 
	0.00 to 170.00 for a 170 degree camera shutter, or
	0.00 to 120.00 for a 120 degree camera shutter.
	See INTERP(OPCSDEFS) for configuring the camera's fader settings.

    NOTES
        SHU during fades or dissolves effectively CANCELS them,
	forcing the fader to the specified [degrees] position.

	Although floating point degrees can be specified to many digits,
	actual movement will be limited to the physical resolution of the
	motor hardware. Example: If the fader is at 2.00 degrees and you
	invoke 'spd 2.01', if the resulting physical distance of such a move
	is less than a single microstep on the motor, the motor will not
	move at all, and the display will still indicate 2.00.

	The fader's floating point position is limited to 2 digits after the
	decimal point. Internally the software manages the hardware's actual
	position, which may be more accurate than what the display shows.
	So the hardware will, if capable, manage e.g. 54.000594 as a valid
	physical position internally, even if the display only shows '54.00'.

    SEE ALSO
        OPCS Commands
        CAM(OPCS)            - shoot camera (fades/dissolves too)
        OPN(OPCS), CLS(OPCS) - open/close fader shutter
        SHU(OPCS)            - move fader to an absolute position in degrees
        DXI(OPCS), DXO(OPCS) - set up dissolve in/out
        FDI(OPCS), FDO(OPCS) - set up fade in/out

        OPCSDEFS Commands
        FLOG(OPCSDEFS)   - set Fader LOGarithmic curve for custom fades
        FRANGE(OPCSDEFS) - set fade/dx's degrees range (for Hicon film stocks)
        INTERP(OPCSDEFS) - set interpolation positions (fader, focus, etc)
        SLOP(OPCSDEFS)   - correct for slop in a motor (fader, focus, etc)

        General
        MATH(DOCS)       - math expressions (for use in frame specifications)
        SYNTAX(DOCS)     - online calculator and OPCS math expression syntax

    ORIGIN
	Gregory Ercolano, Los Feliz California 11/29/89