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Opens or closes the pinhole mask camera shutter.
Format: UPINMASK <parameter>
Range: 0, 1, OUT or IN
Defaults: Defaults to uninitialised on power--up
Examples : UPINMASK 0
Comments: The pinhole mask is intended to be illuminated with the flatfielding LED, when a pattern of reference marks will be projected onto the detector. This makes it possible to determine detector distortion.