Command StopAcquisition :

Stop acquiring spectra. Depending on the set integration time
it may take a while until the device goes from state MOVING ( = acquiring)
to state ON, since it will only go to ON after the current spectrum
has been read.

StopAcquisition Definition
Input Argument	Tango::DEV_VOID
Output Argument	Tango::DEV_VOID
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command NOT allowed for	ON FAULT	..